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Message-ID:
 <MA0P287MB282247BF1A55FF848B1BBF39FE3C2@MA0P287MB2822.INDP287.PROD.OUTLOOK.COM>
Date: Thu, 4 Apr 2024 09:04:23 +0800
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v13 4/5] clk: sophgo: Add SG2042 clock driver
To: Chen Wang <unicornxw@gmail.com>, aou@eecs.berkeley.edu,
 chao.wei@sophgo.com, conor@kernel.org, krzysztof.kozlowski+dt@linaro.org,
 mturquette@baylibre.com, palmer@dabbelt.com, paul.walmsley@sifive.com,
 richardcochran@gmail.com, robh+dt@kernel.org, sboyd@kernel.org,
 devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
 haijiao.liu@sophgo.com, xiaoguang.xing@sophgo.com, guoren@kernel.org,
 jszhang@kernel.org, inochiama@outlook.com, samuel.holland@sifive.com
References: <cover.1711692169.git.unicorn_wang@outlook.com>
 <816122e9f22ddd9927e81e627be7f4683ba5c9e8.1711692169.git.unicorn_wang@outlook.com>
From: Chen Wang <unicorn_wang@outlook.com>
In-Reply-To: <816122e9f22ddd9927e81e627be7f4683ba5c9e8.1711692169.git.unicorn_wang@outlook.com>
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Ping ~~~

Hi, Stephen,

Can you please take a review of this patch, I have improved the code as 
per your comments in v11.

If it looks good to you, I hope this patchset(driver and bindings part) 
can be picked into 6.10, and I will handle the left dts part.

Thanks,

Chen

On 2024/3/29 14:21, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
>
> Add a driver for the SOPHGO SG2042 clocks.
>
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>   drivers/clk/Kconfig                    |    1 +
>   drivers/clk/Makefile                   |    1 +
>   drivers/clk/sophgo/Kconfig             |    7 +
>   drivers/clk/sophgo/Makefile            |    2 +
>   drivers/clk/sophgo/clk-sophgo-sg2042.c | 1410 ++++++++++++++++++++++++
>   drivers/clk/sophgo/clk-sophgo-sg2042.h |  216 ++++
>   6 files changed, 1637 insertions(+)
>   create mode 100644 drivers/clk/sophgo/Kconfig
>   create mode 100644 drivers/clk/sophgo/Makefile
>   create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.c
>   create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.h
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 50af5fc7f570..bc28502ec3c9 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -489,6 +489,7 @@ source "drivers/clk/rockchip/Kconfig"
>   source "drivers/clk/samsung/Kconfig"
>   source "drivers/clk/sifive/Kconfig"
>   source "drivers/clk/socfpga/Kconfig"
> +source "drivers/clk/sophgo/Kconfig"
>   source "drivers/clk/sprd/Kconfig"
>   source "drivers/clk/starfive/Kconfig"
>   source "drivers/clk/sunxi/Kconfig"
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 14fa8d4ecc1f..4abe16c8ccdf 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -118,6 +118,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip/
>   obj-$(CONFIG_COMMON_CLK_SAMSUNG)	+= samsung/
>   obj-$(CONFIG_CLK_SIFIVE)		+= sifive/
>   obj-y					+= socfpga/
> +obj-y					+= sophgo/
>   obj-$(CONFIG_PLAT_SPEAR)		+= spear/
>   obj-y					+= sprd/
>   obj-$(CONFIG_ARCH_STI)			+= st/
> diff --git a/drivers/clk/sophgo/Kconfig b/drivers/clk/sophgo/Kconfig
> new file mode 100644
> index 000000000000..2523818d64f9
> --- /dev/null
> +++ b/drivers/clk/sophgo/Kconfig
> @@ -0,0 +1,7 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config CLK_SOPHGO_SG2042
> +	bool "Sophgo SG2042 clock support"
> +	depends on ARCH_SOPHGO || COMPILE_TEST
> +	help
> +	  Say yes here to support the clock controller on the Sophgo SG2042 SoC.
> diff --git a/drivers/clk/sophgo/Makefile b/drivers/clk/sophgo/Makefile
> new file mode 100644
> index 000000000000..13834cce260c
> --- /dev/null
> +++ b/drivers/clk/sophgo/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_CLK_SOPHGO_SG2042)	+= clk-sophgo-sg2042.o
> diff --git a/drivers/clk/sophgo/clk-sophgo-sg2042.c b/drivers/clk/sophgo/clk-sophgo-sg2042.c
> new file mode 100644
> index 000000000000..7b468e7299ae
> --- /dev/null
> +++ b/drivers/clk/sophgo/clk-sophgo-sg2042.c
> @@ -0,0 +1,1410 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Sophgo SG2042 Clock Generator Driver
> + *
> + * Copyright (C) 2024 Sophgo Technology Inc. All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/iopoll.h>
> +#include <linux/platform_device.h>
> +
> +/*
> + * The clock of SG2042 is composed of three parts.
> + * The registers of these three parts of the clock are scattered in three
> + * different memory address spaces:
> + * - pll clocks
> + * - gate clocks for RP subsystem
> + * - div/mux, and gate clocks working for other subsystem than RP subsystem
> + */
> +#include <dt-bindings/clock/sophgo,sg2042-pll.h>
> +#include <dt-bindings/clock/sophgo,sg2042-rpgate.h>
> +#include <dt-bindings/clock/sophgo,sg2042-clkgen.h>
> +
> +#include "clk-sophgo-sg2042.h"
> +
> +#define KHZ 1000UL
> +#define MHZ (KHZ * KHZ)
> +
> +#define REFDIV_MIN 1
> +#define REFDIV_MAX 63
> +#define FBDIV_MIN 16
> +#define FBDIV_MAX 320
> +
> +#define PLL_FREF_SG2042 (25 * MHZ)
> +
> +#define PLL_FOUTPOSTDIV_MIN (16 * MHZ)
> +#define PLL_FOUTPOSTDIV_MAX (3200 * MHZ)
> +
> +#define PLL_FOUTVCO_MIN (800 * MHZ)
> +#define PLL_FOUTVCO_MAX (3200 * MHZ)
> +
> +struct sg2042_pll_ctrl {
> +	unsigned long freq;
> +	unsigned int fbdiv;
> +	unsigned int postdiv1;
> +	unsigned int postdiv2;
> +	unsigned int refdiv;
> +};
> +
> +#define PLLCTRL_FBDIV_SHIFT	16
> +#define PLLCTRL_FBDIV_MASK	(GENMASK(27, 16) >> PLLCTRL_FBDIV_SHIFT)
> +#define PLLCTRL_POSTDIV2_SHIFT	12
> +#define PLLCTRL_POSTDIV2_MASK	(GENMASK(14, 12) >> PLLCTRL_POSTDIV2_SHIFT)
> +#define PLLCTRL_POSTDIV1_SHIFT	8
> +#define PLLCTRL_POSTDIV1_MASK	(GENMASK(10, 8) >> PLLCTRL_POSTDIV1_SHIFT)
> +#define PLLCTRL_REFDIV_SHIFT	0
> +#define PLLCTRL_REFDIV_MASK	(GENMASK(5, 0) >> PLLCTRL_REFDIV_SHIFT)
> +
> +static inline u32 sg2042_pll_ctrl_encode(struct sg2042_pll_ctrl *ctrl)
> +{
> +	return ((ctrl->fbdiv & PLLCTRL_FBDIV_MASK) << PLLCTRL_FBDIV_SHIFT) |
> +	       ((ctrl->postdiv2 & PLLCTRL_POSTDIV2_MASK) << PLLCTRL_POSTDIV2_SHIFT) |
> +	       ((ctrl->postdiv1 & PLLCTRL_POSTDIV1_MASK) << PLLCTRL_POSTDIV1_SHIFT) |
> +	       ((ctrl->refdiv & PLLCTRL_REFDIV_MASK) << PLLCTRL_REFDIV_SHIFT);
> +}
> +
> +static inline void sg2042_pll_ctrl_decode(unsigned int reg_value,
> +					  struct sg2042_pll_ctrl *ctrl)
> +{
> +	ctrl->fbdiv = (reg_value >> PLLCTRL_FBDIV_SHIFT) & PLLCTRL_FBDIV_MASK;
> +	ctrl->refdiv = (reg_value >> PLLCTRL_REFDIV_SHIFT) & PLLCTRL_REFDIV_MASK;
> +	ctrl->postdiv1 = (reg_value >> PLLCTRL_POSTDIV1_SHIFT) & PLLCTRL_POSTDIV1_MASK;
> +	ctrl->postdiv2 = (reg_value >> PLLCTRL_POSTDIV2_SHIFT) & PLLCTRL_POSTDIV2_MASK;
> +}
> +
> +static inline int sg2042_pll_enable(struct sg2042_pll_clock *pll, bool en)
> +{
> +	unsigned int value = 0;
> +
> +	if (en) {
> +		/* wait pll lock */
> +		if (readl_poll_timeout_atomic(pll->base + pll->offset_status,
> +					      value,
> +					      ((value >> pll->shift_status_lock) & 0x1),
> +					      0,
> +					      100000))
> +			pr_warn("%s not locked\n", pll->hw.init->name);
> +
> +		/* wait pll updating */
> +		if (readl_poll_timeout_atomic(pll->base + pll->offset_status,
> +					      value,
> +					      !((value >> pll->shift_status_updating) & 0x1),
> +					      0,
> +					      100000))
> +			pr_warn("%s still updating\n", pll->hw.init->name);
> +
> +		/* enable pll */
> +		value = readl(pll->base + pll->offset_enable);
> +		writel(value | (1 << pll->shift_enable), pll->base + pll->offset_enable);
> +	} else {
> +		/* disable pll */
> +		value = readl(pll->base + pll->offset_enable);
> +		writel(value & (~(1 << pll->shift_enable)), pll->base + pll->offset_enable);
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * @reg_value: current register value
> + * @parent_rate: parent frequency
> + *
> + * This function is used to calculate below "rate" in equation
> + * rate = (parent_rate/REFDIV) x FBDIV/POSTDIV1/POSTDIV2
> + *      = (parent_rate x FBDIV) / (REFDIV x POSTDIV1 x POSTDIV2)
> + */
> +static unsigned long sg2042_pll_recalc_rate(unsigned int reg_value,
> +					    unsigned long parent_rate)
> +{
> +	struct sg2042_pll_ctrl ctrl_table;
> +	u64 rate, numerator, denominator;
> +
> +	sg2042_pll_ctrl_decode(reg_value, &ctrl_table);
> +
> +	numerator = parent_rate * ctrl_table.fbdiv;
> +	denominator = ctrl_table.refdiv * ctrl_table.postdiv1 * ctrl_table.postdiv2;
> +	do_div(numerator, denominator);
> +	rate = numerator;
> +
> +	return rate;
> +}
> +
> +/*
> + * Based on input rate/prate/fbdiv/refdiv, look up the postdiv1_2 table
> + * to get the closest postdiiv combination.
> + * postdiv1_2 contains all the possible combination lists of POSTDIV1 and POSTDIV2
> + * for example:
> + * postdiv1_2[0] = {2, 4, 8}, where div1 = 2, div2 = 4 , div1 * div2 = 8
> + *
> + * See TRM:
> + * FOUTPOSTDIV = FREF * FBDIV / REFDIV / (POSTDIV1 * POSTDIV2)
> + * So we get following formula to get POSTDIV1 and POSTDIV2:
> + * POSTDIV = (prate/REFDIV) x FBDIV/rate
> + * above POSTDIV = POSTDIV1*POSTDIV2
> + *
> + * @rate: FOUTPOSTDIV
> + * @prate: parent rate, i.e. FREF
> + * @fbdiv: FBDIV
> + * @refdiv: REFDIV
> + * @postdiv1: POSTDIV1, output
> + * @postdiv2: POSTDIV2, output
> + */
> +static int sg2042_pll_get_postdiv_1_2(unsigned long rate,
> +				      unsigned long prate,
> +				      unsigned int fbdiv,
> +				      unsigned int refdiv,
> +				      unsigned int *postdiv1,
> +				      unsigned int *postdiv2)
> +{
> +	int index;
> +	u64 tmp0;
> +
> +	/* POSTDIV_RESULT_INDEX point to 3rd element in the array postdiv1_2 */
> +	#define	POSTDIV_RESULT_INDEX	2
> +
> +	static int postdiv1_2[][3] = {
> +		{2, 4,  8}, {3, 3,  9}, {2, 5, 10}, {2, 6, 12},
> +		{2, 7, 14}, {3, 5, 15}, {4, 4, 16}, {3, 6, 18},
> +		{4, 5, 20}, {3, 7, 21}, {4, 6, 24}, {5, 5, 25},
> +		{4, 7, 28}, {5, 6, 30}, {5, 7, 35}, {6, 6, 36},
> +		{6, 7, 42}, {7, 7, 49}
> +	};
> +
> +	/* prate/REFDIV and result save to tmp0 */
> +	tmp0 = prate;
> +	do_div(tmp0, refdiv);
> +
> +	/* ((prate/REFDIV) x FBDIV) and result save to tmp0 */
> +	tmp0 *= fbdiv;
> +
> +	/* ((prate/REFDIV) x FBDIV)/rate and result save to tmp0 */
> +	do_div(tmp0, rate);
> +
> +	/* tmp0 is POSTDIV1*POSTDIV2, now we calculate div1 and div2 value */
> +	if (tmp0 <= 7) {
> +		/* (div1 * div2) <= 7, no need to use array search */
> +		*postdiv1 = tmp0;
> +		*postdiv2 = 1;
> +		return 0;
> +	}
> +
> +	/* (div1 * div2) > 7, use array search */
> +	for (index = 0; index < ARRAY_SIZE(postdiv1_2); index++) {
> +		if (tmp0 > postdiv1_2[index][POSTDIV_RESULT_INDEX]) {
> +			continue;
> +		} else {
> +			/* found it */
> +			*postdiv1 = postdiv1_2[index][1];
> +			*postdiv2 = postdiv1_2[index][0];
> +			return 0;
> +		}
> +	}
> +	pr_warn("%s can not find in postdiv array!\n", __func__);
> +	return -EINVAL;
> +}
> +
> +/*
> + * Based on the given FOUTPISTDIV and the input FREF to calculate
> + * the REFDIV/FBDIV/PSTDIV1/POSTDIV2 combination for pllctrl register.
> + * @req_rate: expected output clock rate, i.e. FOUTPISTDIV
> + * @parent_rate: input parent clock rate, i.e. FREF
> + * @best: output to hold calculated combination of REFDIV/FBDIV/PSTDIV1/POSTDIV2
> + */
> +static int sg2042_get_pll_ctl_setting(struct sg2042_pll_ctrl *best,
> +				      unsigned long req_rate,
> +				      unsigned long parent_rate)
> +{
> +	int ret;
> +	unsigned int fbdiv, refdiv, postdiv1, postdiv2;
> +	unsigned long foutpostdiv;
> +	u64 tmp;
> +	u64 foutvco;
> +
> +	if (parent_rate != PLL_FREF_SG2042) {
> +		pr_err("INVALID FREF: %ld\n", parent_rate);
> +		return -EINVAL;
> +	}
> +
> +	if (req_rate < PLL_FOUTPOSTDIV_MIN || req_rate > PLL_FOUTPOSTDIV_MAX) {
> +		pr_alert("INVALID FOUTPOSTDIV: %ld\n", req_rate);
> +		return -EINVAL;
> +	}
> +
> +	memset(best, 0, sizeof(struct sg2042_pll_ctrl));
> +
> +	for (refdiv = REFDIV_MIN; refdiv < REFDIV_MAX + 1; refdiv++) {
> +		/* required by hardware: FREF/REFDIV must > 10 */
> +		tmp = parent_rate;
> +		do_div(tmp, refdiv);
> +		if (tmp <= 10)
> +			continue;
> +
> +		for (fbdiv = FBDIV_MIN; fbdiv < FBDIV_MAX + 1; fbdiv++) {
> +			/*
> +			 * FOUTVCO = FREF*FBDIV/REFDIV validation
> +			 * required by hardware, FOUTVCO must [800MHz, 3200MHz]
> +			 */
> +			foutvco = parent_rate * fbdiv;
> +			do_div(foutvco, refdiv);
> +			if (foutvco < PLL_FOUTVCO_MIN || foutvco > PLL_FOUTVCO_MAX)
> +				continue;
> +
> +			ret = sg2042_pll_get_postdiv_1_2(req_rate, parent_rate,
> +							 fbdiv, refdiv,
> +							 &postdiv1, &postdiv2);
> +			if (ret)
> +				continue;
> +
> +			/*
> +			 * FOUTPOSTDIV = FREF*FBDIV/REFDIV/(POSTDIV1*POSTDIV2)
> +			 *             = FOUTVCO/(POSTDIV1*POSTDIV2)
> +			 */
> +			tmp = foutvco;
> +			do_div(tmp, (postdiv1 * postdiv2));
> +			foutpostdiv = (unsigned long)tmp;
> +			/* Iterative to approach the expected value */
> +			if (abs_diff(foutpostdiv, req_rate) < abs_diff(best->freq, req_rate)) {
> +				best->freq = foutpostdiv;
> +				best->refdiv = refdiv;
> +				best->fbdiv = fbdiv;
> +				best->postdiv1 = postdiv1;
> +				best->postdiv2 = postdiv2;
> +				if (foutpostdiv == req_rate)
> +					return 0;
> +			}
> +			continue;
> +		}
> +	}
> +
> +	if (best->freq == 0)
> +		return -EINVAL;
> +	else
> +		return 0;
> +}
> +
> +/*
> + * @hw: ccf use to hook get sg2042_pll_clock
> + * @parent_rate: parent rate
> + *
> + * The is function will be called through clk_get_rate
> + * and return current rate after decoding reg value
> + */
> +static unsigned long sg2042_clk_pll_recalc_rate(struct clk_hw *hw,
> +						unsigned long parent_rate)
> +{
> +	unsigned int value;
> +	unsigned long rate;
> +	struct sg2042_pll_clock *pll = to_sg2042_pll_clk(hw);
> +
> +	value = readl(pll->base + pll->offset_ctrl);
> +	rate = sg2042_pll_recalc_rate(value, parent_rate);
> +
> +	pr_debug("--> %s: pll_recalc_rate: val = %ld\n",
> +		 clk_hw_get_name(hw), rate);
> +	return rate;
> +}
> +
> +static long sg2042_clk_pll_round_rate(struct clk_hw *hw,
> +				      unsigned long req_rate,
> +				      unsigned long *prate)
> +{
> +	unsigned int value;
> +	struct sg2042_pll_ctrl pctrl_table;
> +	long proper_rate;
> +	int ret;
> +
> +	ret = sg2042_get_pll_ctl_setting(&pctrl_table, req_rate, *prate);
> +	if (ret) {
> +		proper_rate = 0;
> +		goto out;
> +	}
> +
> +	value = sg2042_pll_ctrl_encode(&pctrl_table);
> +	proper_rate = (long)sg2042_pll_recalc_rate(value, *prate);
> +
> +out:
> +	pr_debug("--> %s: pll_round_rate: val = %ld\n",
> +		 clk_hw_get_name(hw), proper_rate);
> +	return proper_rate;
> +}
> +
> +static int sg2042_clk_pll_determine_rate(struct clk_hw *hw,
> +					 struct clk_rate_request *req)
> +{
> +	req->rate = sg2042_clk_pll_round_rate(hw, min(req->rate, req->max_rate),
> +					      &req->best_parent_rate);
> +	pr_debug("--> %s: pll_determine_rate: val = %ld\n",
> +		 clk_hw_get_name(hw), req->rate);
> +	return 0;
> +}
> +
> +static int sg2042_clk_pll_set_rate(struct clk_hw *hw,
> +				   unsigned long rate,
> +				   unsigned long parent_rate)
> +{
> +	unsigned long flags;
> +	unsigned int value;
> +	int ret = 0;
> +	struct sg2042_pll_ctrl pctrl_table;
> +	struct sg2042_pll_clock *pll = to_sg2042_pll_clk(hw);
> +
> +	spin_lock_irqsave(pll->lock, flags);
> +	if (sg2042_pll_enable(pll, 0)) {
> +		pr_warn("Can't disable pll(%s), status error\n", pll->hw.init->name);
> +		goto out;
> +	}
> +	ret = sg2042_get_pll_ctl_setting(&pctrl_table, rate, parent_rate);
> +	if (ret) {
> +		pr_warn("%s: Can't find a proper pll setting\n", pll->hw.init->name);
> +		goto out2;
> +	}
> +
> +	value = sg2042_pll_ctrl_encode(&pctrl_table);
> +
> +	/* write the value to top register */
> +	writel(value, pll->base + pll->offset_ctrl);
> +
> +out2:
> +	sg2042_pll_enable(pll, 1);
> +out:
> +	spin_unlock_irqrestore(pll->lock, flags);
> +
> +	pr_debug("--> %s: pll_set_rate: val = 0x%x\n",
> +		 clk_hw_get_name(hw), value);
> +	return ret;
> +}
> +
> +static const struct clk_ops sg2042_clk_pll_ops = {
> +	.recalc_rate = sg2042_clk_pll_recalc_rate,
> +	.round_rate = sg2042_clk_pll_round_rate,
> +	.determine_rate = sg2042_clk_pll_determine_rate,
> +	.set_rate = sg2042_clk_pll_set_rate,
> +};
> +
> +static const struct clk_ops sg2042_clk_pll_ro_ops = {
> +	.recalc_rate = sg2042_clk_pll_recalc_rate,
> +	.round_rate = sg2042_clk_pll_round_rate,
> +};
> +
> +static unsigned long sg2042_clk_divider_recalc_rate(struct clk_hw *hw,
> +						    unsigned long parent_rate)
> +{
> +	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
> +	unsigned int val;
> +	unsigned long ret_rate;
> +
> +	if (!(readl(divider->reg) & BIT(3))) {
> +		val = (int)(divider->initval);
> +	} else {
> +		val = readl(divider->reg) >> divider->shift;
> +		val &= clk_div_mask(divider->width);
> +	}
> +
> +	ret_rate = divider_recalc_rate(hw, parent_rate, val, NULL,
> +				       divider->div_flags, divider->width);
> +
> +	pr_debug("--> %s: divider_recalc_rate: ret_rate = %ld\n",
> +		 clk_hw_get_name(hw), ret_rate);
> +	return ret_rate;
> +}
> +
> +static long sg2042_clk_divider_round_rate(struct clk_hw *hw,
> +					  unsigned long rate,
> +					  unsigned long *prate)
> +{
> +	int bestdiv;
> +	unsigned long ret_rate;
> +	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
> +
> +	/* if read only, just return current value */
> +	if (divider->div_flags & CLK_DIVIDER_READ_ONLY) {
> +		if (!(readl(divider->reg) & BIT(3))) {
> +			bestdiv = (int)(divider->initval);
> +		} else {
> +			bestdiv = readl(divider->reg) >> divider->shift;
> +			bestdiv &= clk_div_mask(divider->width);
> +		}
> +		ret_rate = DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
> +	} else {
> +		ret_rate = divider_round_rate(hw, rate, prate, NULL,
> +					      divider->width, divider->div_flags);
> +	}
> +
> +	pr_debug("--> %s: divider_round_rate: val = %ld\n",
> +		 clk_hw_get_name(hw), ret_rate);
> +	return ret_rate;
> +}
> +
> +static int sg2042_clk_divider_set_rate(struct clk_hw *hw,
> +				       unsigned long rate,
> +				       unsigned long parent_rate)
> +{
> +	unsigned int value;
> +	unsigned int val, val2;
> +	unsigned long flags = 0;
> +	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
> +
> +	value = divider_get_val(rate, parent_rate, NULL,
> +				divider->width, divider->div_flags);
> +
> +	if (divider->lock)
> +		spin_lock_irqsave(divider->lock, flags);
> +	else
> +		__acquire(divider->lock);
> +
> +	/*
> +	 * The sequence of clock frequency modification is:
> +	 * Assert to reset divider.
> +	 * Modify the value of Clock Divide Factor (and High Wide if needed).
> +	 * De-assert to restore divided clock with new frequency.
> +	 */
> +	val = readl(divider->reg);
> +
> +	/* assert */
> +	val &= ~0x1;
> +	writel(val, divider->reg);
> +
> +	if (divider->div_flags & CLK_DIVIDER_HIWORD_MASK) {
> +		val = clk_div_mask(divider->width) << (divider->shift + 16);
> +	} else {
> +		val = readl(divider->reg);
> +		val &= ~(clk_div_mask(divider->width) << divider->shift);
> +	}
> +	val |= value << divider->shift;
> +	val |= 1 << 3;
> +	writel(val, divider->reg);
> +	val2 = val;
> +
> +	/* de-assert */
> +	val |= 1;
> +	writel(val, divider->reg);
> +
> +	if (divider->lock)
> +		spin_unlock_irqrestore(divider->lock, flags);
> +	else
> +		__release(divider->lock);
> +
> +	pr_debug("--> %s: divider_set_rate: register val = 0x%x\n",
> +		 clk_hw_get_name(hw), val2);
> +	return 0;
> +}
> +
> +static const struct clk_ops sg2042_clk_divider_ops = {
> +	.recalc_rate = sg2042_clk_divider_recalc_rate,
> +	.round_rate = sg2042_clk_divider_round_rate,
> +	.set_rate = sg2042_clk_divider_set_rate,
> +};
> +
> +static const struct clk_ops sg2042_clk_divider_ro_ops = {
> +	.recalc_rate = sg2042_clk_divider_recalc_rate,
> +	.round_rate = sg2042_clk_divider_round_rate,
> +};
> +
> +#define SG2042_PLL(_id, _name, _parent_name, _r_stat, _r_enable, _r_ctrl, _shift) \
> +	{								\
> +		.hw.init = CLK_HW_INIT(					\
> +				_name,					\
> +				_parent_name,				\
> +				&sg2042_clk_pll_ops,			\
> +				CLK_GET_RATE_NOCACHE | CLK_GET_ACCURACY_NOCACHE),\
> +		.id = _id,						\
> +		.offset_ctrl = _r_ctrl,					\
> +		.offset_status = _r_stat,				\
> +		.offset_enable = _r_enable,				\
> +		.shift_status_lock = 8 + (_shift),			\
> +		.shift_status_updating = _shift,			\
> +		.shift_enable = _shift,					\
> +	}
> +
> +#define SG2042_PLL_RO(_id, _name, _parent_name, _r_stat, _r_enable, _r_ctrl, _shift) \
> +	{								\
> +		.hw.init = CLK_HW_INIT(					\
> +				_name,					\
> +				_parent_name,				\
> +				&sg2042_clk_pll_ro_ops,			\
> +				CLK_GET_RATE_NOCACHE | CLK_GET_ACCURACY_NOCACHE),\
> +		.id = _id,						\
> +		.offset_ctrl = _r_ctrl,					\
> +		.offset_status = _r_stat,				\
> +		.offset_enable = _r_enable,				\
> +		.shift_status_lock = 8 + (_shift),			\
> +		.shift_status_updating = _shift,			\
> +		.shift_enable = _shift,					\
> +	}
> +
> +static struct sg2042_pll_clock sg2042_pll_clks[] = {
> +	SG2042_PLL(MPLL_CLK, "mpll_clock", "cgi_main",
> +		   R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_MPLL_CONTROL, 0),
> +	SG2042_PLL_RO(FPLL_CLK, "fpll_clock", "cgi_main",
> +		      R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_FPLL_CONTROL, 3),
> +	SG2042_PLL_RO(DPLL0_CLK, "dpll0_clock", "cgi_dpll0",
> +		      R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_DPLL0_CONTROL, 4),
> +	SG2042_PLL_RO(DPLL1_CLK, "dpll1_clock", "cgi_dpll1",
> +		      R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_DPLL1_CONTROL, 5),
> +};
> +
> +#define SG2042_DIV(_id, _name, _parent_name,				\
> +		  _r_ctrl, _shift, _width,				\
> +		  _div_flag, _initval) {				\
> +		.hw.init = CLK_HW_INIT(					\
> +				_name,					\
> +				_parent_name,				\
> +				&sg2042_clk_divider_ops,		\
> +				0),					\
> +		.id = _id,						\
> +		.offset_ctrl = _r_ctrl,					\
> +		.shift = _shift,					\
> +		.width = _width,					\
> +		.div_flags = _div_flag,					\
> +		.initval = _initval,					\
> +	}
> +
> +#define SG2042_DIV_RO(_id, _name, _parent_name,				\
> +		  _r_ctrl, _shift, _width,				\
> +		  _div_flag, _initval) {				\
> +		.hw.init = CLK_HW_INIT(					\
> +				_name,					\
> +				_parent_name,				\
> +				&sg2042_clk_divider_ro_ops,		\
> +				0),					\
> +		.id = _id,						\
> +		.offset_ctrl = _r_ctrl,					\
> +		.shift = _shift,					\
> +		.width = _width,					\
> +		.div_flags = (_div_flag) | CLK_DIVIDER_READ_ONLY,	\
> +		.initval = _initval,					\
> +	}
> +
> +/*
> + * DIV items in the array are sorted according to the clock-tree diagram,
> + * from top to bottom, from upstream to downstream. Read TRM for details.
> + */
> +#define DEF_DIVFLAG (CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO)
> +static struct sg2042_divider_clock sg2042_div_clks[] = {
> +	SG2042_DIV_RO(DIV_CLK_DPLL0_DDR01_0,
> +		      "clk_div_ddr01_0", "clk_gate_ddr01_div0",
> +		      R_CLKDIVREG27, 16, 5, DEF_DIVFLAG, 1),
> +	SG2042_DIV_RO(DIV_CLK_FPLL_DDR01_1,
> +		      "clk_div_ddr01_1", "clk_gate_ddr01_div1",
> +		      R_CLKDIVREG28, 16, 5, DEF_DIVFLAG, 1),
> +
> +	SG2042_DIV_RO(DIV_CLK_DPLL1_DDR23_0,
> +		      "clk_div_ddr23_0", "clk_gate_ddr23_div0",
> +		      R_CLKDIVREG29, 16, 5, DEF_DIVFLAG, 1),
> +	SG2042_DIV_RO(DIV_CLK_FPLL_DDR23_1,
> +		      "clk_div_ddr23_1", "clk_gate_ddr23_div1",
> +		      R_CLKDIVREG30, 16, 5, DEF_DIVFLAG, 1),
> +
> +	SG2042_DIV(DIV_CLK_MPLL_RP_CPU_NORMAL_0,
> +		   "clk_div_rp_cpu_normal_0", "clk_gate_rp_cpu_normal_div0",
> +		   R_CLKDIVREG0, 16, 5, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_RP_CPU_NORMAL_1,
> +		   "clk_div_rp_cpu_normal_1", "clk_gate_rp_cpu_normal_div1",
> +		   R_CLKDIVREG1, 16, 5, DEF_DIVFLAG, 1),
> +
> +	SG2042_DIV(DIV_CLK_MPLL_AXI_DDR_0,
> +		   "clk_div_axi_ddr_0", "clk_gate_axi_ddr_div0",
> +		   R_CLKDIVREG25, 16, 5, DEF_DIVFLAG, 2),
> +	SG2042_DIV(DIV_CLK_FPLL_AXI_DDR_1,
> +		   "clk_div_axi_ddr_1", "clk_gate_axi_ddr_div1",
> +		   R_CLKDIVREG26, 16, 5, DEF_DIVFLAG, 1),
> +
> +	SG2042_DIV(DIV_CLK_FPLL_TOP_RP_CMN_DIV2,
> +		   "clk_div_top_rp_cmn_div2", "clk_mux_rp_cpu_normal",
> +		   R_CLKDIVREG3, 16, 16, DEF_DIVFLAG, 2),
> +
> +	SG2042_DIV(DIV_CLK_FPLL_50M_A53, "clk_div_50m_a53", "fpll_clock",
> +		   R_CLKDIVREG2, 16, 8, DEF_DIVFLAG, 20),
> +	/* downstream of div_50m_a53 */
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER1, "clk_div_timer1", "clk_div_50m_a53",
> +		   R_CLKDIVREG6, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER2, "clk_div_timer2", "clk_div_50m_a53",
> +		   R_CLKDIVREG7, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER3, "clk_div_timer3", "clk_div_50m_a53",
> +		   R_CLKDIVREG8, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER4, "clk_div_timer4", "clk_div_50m_a53",
> +		   R_CLKDIVREG9, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER5, "clk_div_timer5", "clk_div_50m_a53",
> +		   R_CLKDIVREG10, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER6, "clk_div_timer6", "clk_div_50m_a53",
> +		   R_CLKDIVREG11, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER7, "clk_div_timer7", "clk_div_50m_a53",
> +		   R_CLKDIVREG12, 16, 16, DEF_DIVFLAG, 1),
> +	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER8, "clk_div_timer8", "clk_div_50m_a53",
> +		   R_CLKDIVREG13, 16, 16, DEF_DIVFLAG, 1),
> +
> +	/*
> +	 * Set clk_div_uart_500m as RO, because the width of CLKDIVREG4 is too
> +	 * narrow for us to produce 115200. Use UART internal divider directly.
> +	 */
> +	SG2042_DIV_RO(DIV_CLK_FPLL_UART_500M, "clk_div_uart_500m", "fpll_clock",
> +		      R_CLKDIVREG4, 16, 7, DEF_DIVFLAG, 2),
> +	SG2042_DIV(DIV_CLK_FPLL_AHB_LPC, "clk_div_ahb_lpc", "fpll_clock",
> +		   R_CLKDIVREG5, 16, 16, DEF_DIVFLAG, 5),
> +	SG2042_DIV(DIV_CLK_FPLL_EFUSE, "clk_div_efuse", "fpll_clock",
> +		   R_CLKDIVREG14, 16, 7, DEF_DIVFLAG, 40),
> +	SG2042_DIV(DIV_CLK_FPLL_TX_ETH0, "clk_div_tx_eth0", "fpll_clock",
> +		   R_CLKDIVREG16, 16, 11, DEF_DIVFLAG, 8),
> +	SG2042_DIV(DIV_CLK_FPLL_PTP_REF_I_ETH0,
> +		   "clk_div_ptp_ref_i_eth0", "fpll_clock",
> +		   R_CLKDIVREG17, 16, 8, DEF_DIVFLAG, 20),
> +	SG2042_DIV(DIV_CLK_FPLL_REF_ETH0, "clk_div_ref_eth0", "fpll_clock",
> +		   R_CLKDIVREG18, 16, 8, DEF_DIVFLAG, 40),
> +	SG2042_DIV(DIV_CLK_FPLL_EMMC, "clk_div_emmc", "fpll_clock",
> +		   R_CLKDIVREG19, 16, 5, DEF_DIVFLAG, 10),
> +	SG2042_DIV(DIV_CLK_FPLL_SD, "clk_div_sd", "fpll_clock",
> +		   R_CLKDIVREG21, 16, 5, DEF_DIVFLAG, 10),
> +
> +	SG2042_DIV(DIV_CLK_FPLL_TOP_AXI0, "clk_div_top_axi0", "fpll_clock",
> +		   R_CLKDIVREG23, 16, 5, DEF_DIVFLAG, 10),
> +	/* downstream of div_top_axi0 */
> +	SG2042_DIV(DIV_CLK_FPLL_100K_EMMC, "clk_div_100k_emmc", "clk_div_top_axi0",
> +		   R_CLKDIVREG20, 16, 16, DEF_DIVFLAG, 1000),
> +	SG2042_DIV(DIV_CLK_FPLL_100K_SD, "clk_div_100k_sd", "clk_div_top_axi0",
> +		   R_CLKDIVREG22, 16, 16, DEF_DIVFLAG, 1000),
> +	SG2042_DIV(DIV_CLK_FPLL_GPIO_DB, "clk_div_gpio_db", "clk_div_top_axi0",
> +		   R_CLKDIVREG15, 16, 16, DEF_DIVFLAG, 1000),
> +
> +	SG2042_DIV(DIV_CLK_FPLL_TOP_AXI_HSPERI,
> +		   "clk_div_top_axi_hsperi", "fpll_clock",
> +		   R_CLKDIVREG24, 16, 5, DEF_DIVFLAG, 4),
> +};
> +
> +#define SG2042_GATE(_id, _name, _parent_name, _flags,	\
> +		    _r_enable, _bit_idx) {		\
> +		.hw.init = CLK_HW_INIT(			\
> +				_name,			\
> +				_parent_name,		\
> +				NULL,			\
> +				_flags),		\
> +		.id = _id,				\
> +		.offset_enable = _r_enable,		\
> +		.bit_idx = _bit_idx,			\
> +	}
> +
> +/*
> + * GATE items in the array are sorted according to the clock-tree diagram,
> + * from top to bottom, from upstream to downstream. Read TRM for details.
> + */
> +
> +/* Gate clocks which control registers are defined in CLOCK. */
> +static const struct sg2042_gate_clock sg2042_gate_clks[] = {
> +	SG2042_GATE(GATE_CLK_DDR01_DIV0, "clk_gate_ddr01_div0", "dpll0_clock",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
> +		    R_CLKDIVREG27, 4),
> +	SG2042_GATE(GATE_CLK_DDR01_DIV1, "clk_gate_ddr01_div1", "fpll_clock",
> +		    CLK_IS_CRITICAL,
> +		    R_CLKDIVREG28, 4),
> +
> +	SG2042_GATE(GATE_CLK_DDR23_DIV0, "clk_gate_ddr23_div0", "dpll1_clock",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
> +		    R_CLKDIVREG29, 4),
> +	SG2042_GATE(GATE_CLK_DDR23_DIV1, "clk_gate_ddr23_div1", "fpll_clock",
> +		    CLK_IS_CRITICAL,
> +		    R_CLKDIVREG30, 4),
> +
> +	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL_DIV0, "clk_gate_rp_cpu_normal_div0", "mpll_clock",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKDIVREG0, 4),
> +	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL_DIV1,
> +		    "clk_gate_rp_cpu_normal_div1", "fpll_clock",
> +		    CLK_IS_CRITICAL,
> +		    R_CLKDIVREG1, 4),
> +
> +	SG2042_GATE(GATE_CLK_AXI_DDR_DIV0, "clk_gate_axi_ddr_div0", "mpll_clock",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKDIVREG25, 4),
> +	SG2042_GATE(GATE_CLK_AXI_DDR_DIV1, "clk_gate_axi_ddr_div1", "fpll_clock",
> +		    CLK_IS_CRITICAL,
> +		    R_CLKDIVREG26, 4),
> +
> +	/* upon are gate clocks as input source for the muxes */
> +
> +	SG2042_GATE(GATE_CLK_DDR01, "clk_gate_ddr01", "clk_mux_ddr01",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG1, 14),
> +
> +	SG2042_GATE(GATE_CLK_DDR23, "clk_gate_ddr23", "clk_mux_ddr23",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG1, 15),
> +
> +	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL,
> +		    "clk_gate_rp_cpu_normal", "clk_mux_rp_cpu_normal",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG0, 0),
> +
> +	SG2042_GATE(GATE_CLK_AXI_DDR, "clk_gate_axi_ddr", "clk_mux_axi_ddr",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG1, 13),
> +
> +	/* upon are gate clocks directly downstream of muxes */
> +
> +	/* downstream of clk_div_top_rp_cmn_div2 */
> +	SG2042_GATE(GATE_CLK_TOP_RP_CMN_DIV2,
> +		    "clk_gate_top_rp_cmn_div2", "clk_div_top_rp_cmn_div2",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 2),
> +	SG2042_GATE(GATE_CLK_HSDMA, "clk_gate_hsdma", "clk_gate_top_rp_cmn_div2",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 10),
> +
> +	/*
> +	 * downstream of clk_gate_rp_cpu_normal
> +	 *
> +	 * FIXME: there should be one 1/2 DIV between clk_gate_rp_cpu_normal
> +	 * and clk_gate_axi_pcie0/clk_gate_axi_pcie1.
> +	 * But the 1/2 DIV is fixed and no configurable register exported, so
> +	 * when reading from these two clocks, the rate value are still the
> +	 * same as that of clk_gate_rp_cpu_normal, it's not correct.
> +	 * This just affects the value read.
> +	 */
> +	SG2042_GATE(GATE_CLK_AXI_PCIE0,
> +		    "clk_gate_axi_pcie0", "clk_gate_rp_cpu_normal",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG1, 8),
> +	SG2042_GATE(GATE_CLK_AXI_PCIE1,
> +		    "clk_gate_axi_pcie1", "clk_gate_rp_cpu_normal",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG1, 9),
> +
> +	/* downstream of div_50m_a53 */
> +	SG2042_GATE(GATE_CLK_A53_50M, "clk_gate_a53_50m", "clk_div_50m_a53",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 1),
> +	SG2042_GATE(GATE_CLK_TIMER1, "clk_gate_timer1", "clk_div_timer1",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 12),
> +	SG2042_GATE(GATE_CLK_TIMER2, "clk_gate_timer2", "clk_div_timer2",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 13),
> +	SG2042_GATE(GATE_CLK_TIMER3, "clk_gate_timer3", "clk_div_timer3",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 14),
> +	SG2042_GATE(GATE_CLK_TIMER4, "clk_gate_timer4", "clk_div_timer4",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 15),
> +	SG2042_GATE(GATE_CLK_TIMER5, "clk_gate_timer5", "clk_div_timer5",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 16),
> +	SG2042_GATE(GATE_CLK_TIMER6, "clk_gate_timer6", "clk_div_timer6",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 17),
> +	SG2042_GATE(GATE_CLK_TIMER7, "clk_gate_timer7", "clk_div_timer7",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 18),
> +	SG2042_GATE(GATE_CLK_TIMER8, "clk_gate_timer8", "clk_div_timer8",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 19),
> +
> +	/* gate clocks downstream from div clocks one-to-one */
> +	SG2042_GATE(GATE_CLK_UART_500M, "clk_gate_uart_500m", "clk_div_uart_500m",
> +		    CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 4),
> +	SG2042_GATE(GATE_CLK_AHB_LPC, "clk_gate_ahb_lpc", "clk_div_ahb_lpc",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 7),
> +	SG2042_GATE(GATE_CLK_EFUSE, "clk_gate_efuse", "clk_div_efuse",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 20),
> +	SG2042_GATE(GATE_CLK_TX_ETH0, "clk_gate_tx_eth0", "clk_div_tx_eth0",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 30),
> +	SG2042_GATE(GATE_CLK_PTP_REF_I_ETH0,
> +		    "clk_gate_ptp_ref_i_eth0", "clk_div_ptp_ref_i_eth0",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 0),
> +	SG2042_GATE(GATE_CLK_REF_ETH0, "clk_gate_ref_eth0", "clk_div_ref_eth0",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 1),
> +	SG2042_GATE(GATE_CLK_EMMC_100M, "clk_gate_emmc", "clk_div_emmc",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 3),
> +	SG2042_GATE(GATE_CLK_SD_100M, "clk_gate_sd", "clk_div_sd",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 6),
> +
> +	/* downstream of clk_div_top_axi0 */
> +	SG2042_GATE(GATE_CLK_AHB_ROM, "clk_gate_ahb_rom", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 8),
> +	SG2042_GATE(GATE_CLK_AHB_SF, "clk_gate_ahb_sf", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 9),
> +	SG2042_GATE(GATE_CLK_AXI_SRAM, "clk_gate_axi_sram", "clk_div_top_axi0",
> +		    CLK_IGNORE_UNUSED, R_CLKENREG0, 10),
> +	SG2042_GATE(GATE_CLK_APB_TIMER, "clk_gate_apb_timer", "clk_div_top_axi0",
> +		    CLK_IGNORE_UNUSED, R_CLKENREG0, 11),
> +	SG2042_GATE(GATE_CLK_APB_EFUSE, "clk_gate_apb_efuse", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 21),
> +	SG2042_GATE(GATE_CLK_APB_GPIO, "clk_gate_apb_gpio", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 22),
> +	SG2042_GATE(GATE_CLK_APB_GPIO_INTR,
> +		    "clk_gate_apb_gpio_intr", "clk_div_top_axi0",
> +		    CLK_IS_CRITICAL, R_CLKENREG0, 23),
> +	SG2042_GATE(GATE_CLK_APB_I2C, "clk_gate_apb_i2c", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 26),
> +	SG2042_GATE(GATE_CLK_APB_WDT, "clk_gate_apb_wdt", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 27),
> +	SG2042_GATE(GATE_CLK_APB_PWM, "clk_gate_apb_pwm", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 28),
> +	SG2042_GATE(GATE_CLK_APB_RTC, "clk_gate_apb_rtc", "clk_div_top_axi0",
> +		    0, R_CLKENREG0, 29),
> +	SG2042_GATE(GATE_CLK_TOP_AXI0, "clk_gate_top_axi0", "clk_div_top_axi0",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG1, 11),
> +	/* downstream of DIV clocks which are sourced from clk_div_top_axi0 */
> +	SG2042_GATE(GATE_CLK_GPIO_DB, "clk_gate_gpio_db", "clk_div_gpio_db",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 24),
> +	SG2042_GATE(GATE_CLK_100K_EMMC, "clk_gate_100k_emmc", "clk_div_100k_emmc",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 4),
> +	SG2042_GATE(GATE_CLK_100K_SD, "clk_gate_100k_sd", "clk_div_100k_sd",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 7),
> +
> +	/* downstream of clk_div_top_axi_hsperi */
> +	SG2042_GATE(GATE_CLK_SYSDMA_AXI,
> +		    "clk_gate_sysdma_axi", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 3),
> +	SG2042_GATE(GATE_CLK_APB_UART,
> +		    "clk_gate_apb_uart", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 5),
> +	SG2042_GATE(GATE_CLK_AXI_DBG_I2C,
> +		    "clk_gate_axi_dbg_i2c", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 6),
> +	SG2042_GATE(GATE_CLK_APB_SPI,
> +		    "clk_gate_apb_spi", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 25),
> +	SG2042_GATE(GATE_CLK_AXI_ETH0,
> +		    "clk_gate_axi_eth0", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG0, 31),
> +	SG2042_GATE(GATE_CLK_AXI_EMMC,
> +		    "clk_gate_axi_emmc", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 2),
> +	SG2042_GATE(GATE_CLK_AXI_SD,
> +		    "clk_gate_axi_sd", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT, R_CLKENREG1, 5),
> +	SG2042_GATE(GATE_CLK_TOP_AXI_HSPERI,
> +		    "clk_gate_top_axi_hsperi", "clk_div_top_axi_hsperi",
> +		    CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> +		    R_CLKENREG1, 12),
> +};
> +
> +/*
> + * Gate clocks for RP subsystem (including the MP subsystem), which control
> + * registers are defined in SYS_CTRL.
> + */
> +static const struct sg2042_gate_clock sg2042_gate_rp[] = {
> +	/* downstream of clk_gate_rp_cpu_normal about rxu */
> +	SG2042_GATE(GATE_CLK_RXU0, "clk_gate_rxu0", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 0),
> +	SG2042_GATE(GATE_CLK_RXU1, "clk_gate_rxu1", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 1),
> +	SG2042_GATE(GATE_CLK_RXU2, "clk_gate_rxu2", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 2),
> +	SG2042_GATE(GATE_CLK_RXU3, "clk_gate_rxu3", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 3),
> +	SG2042_GATE(GATE_CLK_RXU4, "clk_gate_rxu4", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 4),
> +	SG2042_GATE(GATE_CLK_RXU5, "clk_gate_rxu5", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 5),
> +	SG2042_GATE(GATE_CLK_RXU6, "clk_gate_rxu6", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 6),
> +	SG2042_GATE(GATE_CLK_RXU7, "clk_gate_rxu7", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 7),
> +	SG2042_GATE(GATE_CLK_RXU8, "clk_gate_rxu8", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 8),
> +	SG2042_GATE(GATE_CLK_RXU9, "clk_gate_rxu9", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 9),
> +	SG2042_GATE(GATE_CLK_RXU10, "clk_gate_rxu10", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 10),
> +	SG2042_GATE(GATE_CLK_RXU11, "clk_gate_rxu11", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 11),
> +	SG2042_GATE(GATE_CLK_RXU12, "clk_gate_rxu12", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 12),
> +	SG2042_GATE(GATE_CLK_RXU13, "clk_gate_rxu13", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 13),
> +	SG2042_GATE(GATE_CLK_RXU14, "clk_gate_rxu14", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 14),
> +	SG2042_GATE(GATE_CLK_RXU15, "clk_gate_rxu15", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 15),
> +	SG2042_GATE(GATE_CLK_RXU16, "clk_gate_rxu16", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 16),
> +	SG2042_GATE(GATE_CLK_RXU17, "clk_gate_rxu17", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 17),
> +	SG2042_GATE(GATE_CLK_RXU18, "clk_gate_rxu18", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 18),
> +	SG2042_GATE(GATE_CLK_RXU19, "clk_gate_rxu19", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 19),
> +	SG2042_GATE(GATE_CLK_RXU20, "clk_gate_rxu20", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 20),
> +	SG2042_GATE(GATE_CLK_RXU21, "clk_gate_rxu21", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 21),
> +	SG2042_GATE(GATE_CLK_RXU22, "clk_gate_rxu22", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 22),
> +	SG2042_GATE(GATE_CLK_RXU23, "clk_gate_rxu23", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 23),
> +	SG2042_GATE(GATE_CLK_RXU24, "clk_gate_rxu24", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 24),
> +	SG2042_GATE(GATE_CLK_RXU25, "clk_gate_rxu25", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 25),
> +	SG2042_GATE(GATE_CLK_RXU26, "clk_gate_rxu26", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 26),
> +	SG2042_GATE(GATE_CLK_RXU27, "clk_gate_rxu27", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 27),
> +	SG2042_GATE(GATE_CLK_RXU28, "clk_gate_rxu28", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 28),
> +	SG2042_GATE(GATE_CLK_RXU29, "clk_gate_rxu29", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 29),
> +	SG2042_GATE(GATE_CLK_RXU30, "clk_gate_rxu30", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 30),
> +	SG2042_GATE(GATE_CLK_RXU31, "clk_gate_rxu31", "clk_gate_rp_cpu_normal",
> +		    0, R_RP_RXU_CLK_ENABLE, 31),
> +
> +	/* downstream of clk_gate_rp_cpu_normal about mp */
> +	SG2042_GATE(GATE_CLK_MP0, "clk_gate_mp0", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP0_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP1, "clk_gate_mp1", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP1_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP2, "clk_gate_mp2", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP2_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP3, "clk_gate_mp3", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP3_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP4, "clk_gate_mp4", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP4_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP5, "clk_gate_mp5", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP5_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP6, "clk_gate_mp6", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP6_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP7, "clk_gate_mp7", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP7_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP8, "clk_gate_mp8", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP8_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP9, "clk_gate_mp9", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP9_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP10, "clk_gate_mp10", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP10_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP11, "clk_gate_mp11", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP11_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP12, "clk_gate_mp12", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP12_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP13, "clk_gate_mp13", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP13_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP14, "clk_gate_mp14", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP14_CONTROL_REG, 0),
> +	SG2042_GATE(GATE_CLK_MP15, "clk_gate_mp15", "clk_gate_rp_cpu_normal",
> +		    CLK_IS_CRITICAL, R_MP15_CONTROL_REG, 0),
> +};
> +
> +#define SG2042_MUX(_id, _name, _parent_names, _flags, _r_select, _shift, _width) { \
> +		.hw.init = CLK_HW_INIT_PARENTS(			\
> +				_name,				\
> +				_parent_names,			\
> +				NULL,				\
> +				_flags),			\
> +		.id = _id,					\
> +		.offset_select = _r_select,			\
> +		.shift = _shift,				\
> +		.width = _width,				\
> +	}
> +
> +/*
> + * Note: regarding names for mux clock, "0/1" or "div0/div1" means the
> + * first/second parent input source, not the register value.
> + * For example:
> + * "clk_div_ddr01_0" is the name of Clock divider 0 control of DDR01, and
> + * "clk_gate_ddr01_div0" is the gate clock in front of the "clk_div_ddr01_0",
> + * they are both controlled by register CLKDIVREG27;
> + * "clk_div_ddr01_1" is the name of Clock divider 1 control of DDR01, and
> + * "clk_gate_ddr01_div1" is the gate clock in front of the "clk_div_ddr01_1",
> + * they are both controlled by register CLKDIVREG28;
> + * While for register value of mux selection, use Clock Select for DDR01’s clock
> + * as example, see CLKSELREG0, bit[2].
> + * 1: Select in_dpll0_clk as clock source, correspondng to the parent input
> + *    source from "clk_div_ddr01_0".
> + * 0: Select in_fpll_clk as clock source, corresponding to the parent input
> + *    source from "clk_div_ddr01_1".
> + * So we need a table to define the array of register values corresponding to
> + * the parent index and tell CCF about this when registering mux clock.
> + */
> +static const u32 sg2042_mux_table[] = {1, 0};
> +
> +static const char *const clk_mux_ddr01_p[] = {
> +			"clk_div_ddr01_0", "clk_div_ddr01_1"};
> +static const char *const clk_mux_ddr23_p[] = {
> +			"clk_div_ddr23_0", "clk_div_ddr23_1"};
> +static const char *const clk_mux_rp_cpu_normal_p[] = {
> +			"clk_div_rp_cpu_normal_0", "clk_div_rp_cpu_normal_1"};
> +static const char *const clk_mux_axi_ddr_p[] = {
> +			"clk_div_axi_ddr_0", "clk_div_axi_ddr_1"};
> +
> +static struct sg2042_mux_clock sg2042_mux_clks[] = {
> +	SG2042_MUX(MUX_CLK_DDR01, "clk_mux_ddr01", clk_mux_ddr01_p,
> +		   CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT | CLK_MUX_READ_ONLY,
> +		   R_CLKSELREG0, 2, 1),
> +	SG2042_MUX(MUX_CLK_DDR23, "clk_mux_ddr23", clk_mux_ddr23_p,
> +		   CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT | CLK_MUX_READ_ONLY,
> +		   R_CLKSELREG0, 3, 1),
> +	SG2042_MUX(MUX_CLK_RP_CPU_NORMAL, "clk_mux_rp_cpu_normal", clk_mux_rp_cpu_normal_p,
> +		   CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
> +		   R_CLKSELREG0, 0, 1),
> +	SG2042_MUX(MUX_CLK_AXI_DDR, "clk_mux_axi_ddr", clk_mux_axi_ddr_p,
> +		   CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
> +		   R_CLKSELREG0, 1, 1),
> +};
> +
> +static DEFINE_SPINLOCK(sg2042_clk_lock);
> +
> +static int sg2042_clk_register_plls(struct sg2042_clk_data *clk_data,
> +				    struct sg2042_pll_clock pll_clks[],
> +				    int num_pll_clks)
> +{
> +	struct clk_hw *hw;
> +	struct sg2042_pll_clock *pll;
> +	int i, ret = 0;
> +
> +	for (i = 0; i < num_pll_clks; i++) {
> +		pll = &pll_clks[i];
> +		/* assign these for ops usage during registration */
> +		pll->base = clk_data->iobase;
> +		pll->lock = &sg2042_clk_lock;
> +
> +		hw = &pll->hw;
> +		ret = clk_hw_register(NULL, hw);
> +		if (ret) {
> +			pr_err("failed to register clock %s\n", pll->hw.init->name);
> +			break;
> +		}
> +
> +		clk_data->onecell_data.hws[pll->id] = hw;
> +	}
> +
> +	/* leave unregister to outside if failed */
> +	return ret;
> +}
> +
> +static int sg2042_clk_register_divs(struct sg2042_clk_data *clk_data,
> +				    struct sg2042_divider_clock div_clks[],
> +				    int num_div_clks)
> +{
> +	struct clk_hw *hw;
> +	struct sg2042_divider_clock *div;
> +	int i, ret = 0;
> +
> +	for (i = 0; i < num_div_clks; i++) {
> +		div = &div_clks[i];
> +
> +		if (div->div_flags & CLK_DIVIDER_HIWORD_MASK) {
> +			if (div->width + div->shift > 16) {
> +				pr_warn("divider value exceeds LOWORD field\n");
> +				ret = -EINVAL;
> +				break;
> +			}
> +		}
> +
> +		div->reg = clk_data->iobase + div->offset_ctrl;
> +		div->lock = &sg2042_clk_lock;
> +
> +		hw = &div->hw;
> +		ret = clk_hw_register(NULL, hw);
> +		if (ret) {
> +			pr_err("failed to register clock %s\n", div->hw.init->name);
> +			break;
> +		}
> +
> +		clk_data->onecell_data.hws[div->id] = hw;
> +	}
> +
> +	/* leave unregister to outside if failed */
> +	return ret;
> +}
> +
> +static int sg2042_clk_register_gates(struct sg2042_clk_data *clk_data,
> +				     const struct sg2042_gate_clock gate_clks[],
> +				     int num_gate_clks)
> +{
> +	struct clk_hw *hw;
> +	const struct sg2042_gate_clock *gate;
> +	int i, ret = 0;
> +
> +	for (i = 0; i < num_gate_clks; i++) {
> +		gate = &gate_clks[i];
> +		hw = clk_hw_register_gate(NULL,
> +					  gate->hw.init->name,
> +					  gate->hw.init->parent_names[0],
> +					  gate->hw.init->flags,
> +					  clk_data->iobase + gate->offset_enable,
> +					  gate->bit_idx,
> +					  0,
> +					  &sg2042_clk_lock);
> +		if (IS_ERR(hw)) {
> +			pr_err("failed to register clock %s\n", gate->hw.init->name);
> +			ret = PTR_ERR(hw);
> +			break;
> +		}
> +
> +		clk_data->onecell_data.hws[gate->id] = hw;
> +	}
> +
> +	/* leave unregister to outside if failed */
> +	return ret;
> +}
> +
> +static int sg2042_mux_notifier_cb(struct notifier_block *nb,
> +				  unsigned long event,
> +				  void *data)
> +{
> +	int ret = 0;
> +	struct clk_notifier_data *ndata = data;
> +	struct clk_hw *hw = __clk_get_hw(ndata->clk);
> +	const struct clk_ops *ops = &clk_mux_ops;
> +	struct sg2042_mux_clock *mux = to_sg2042_mux_nb(nb);
> +
> +	/* To switch to fpll before changing rate and restore after that */
> +	if (event == PRE_RATE_CHANGE) {
> +		mux->original_index = ops->get_parent(hw);
> +
> +		/*
> +		 * "1" is the array index of the second parent input source of
> +		 * mux. For SG2042, it's fpll for all mux clocks.
> +		 * "0" is the array index of the frist parent input source of
> +		 * mux, For SG2042, it's mpll.
> +		 * FIXME, any good idea to avoid magic number?
> +		 */
> +		if (mux->original_index == 0)
> +			ret = ops->set_parent(hw, 1);
> +	} else if (event == POST_RATE_CHANGE) {
> +		ret = ops->set_parent(hw, mux->original_index);
> +	}
> +
> +	return notifier_from_errno(ret);
> +}
> +
> +static int sg2042_clk_register_muxs(struct sg2042_clk_data *clk_data,
> +				    struct sg2042_mux_clock mux_clks[],
> +				    int num_mux_clks)
> +{
> +	struct clk_hw *hw;
> +	struct sg2042_mux_clock *mux;
> +	int i, ret = 0;
> +
> +	for (i = 0; i < num_mux_clks; i++) {
> +		mux = &mux_clks[i];
> +
> +		hw = clk_hw_register_mux_table(NULL,
> +					       mux->hw.init->name,
> +					       mux->hw.init->parent_names,
> +					       mux->hw.init->num_parents,
> +					       mux->hw.init->flags,
> +					       clk_data->iobase + mux->offset_select,
> +					       mux->shift,
> +					       BIT(mux->width) - 1,
> +					       0,
> +					       sg2042_mux_table,
> +					       &sg2042_clk_lock);
> +		if (IS_ERR(hw)) {
> +			pr_err("failed to register clock %s\n", mux->hw.init->name);
> +			ret = PTR_ERR(hw);
> +			break;
> +		}
> +
> +		clk_data->onecell_data.hws[mux->id] = hw;
> +
> +		/*
> +		 * FIXME: Theoretically, we should set parent for the
> +		 * mux, but seems hardware has done this for us with
> +		 * default value, so we don't set parent again here.
> +		 */
> +
> +		if (!(mux->hw.init->flags & CLK_MUX_READ_ONLY)) {
> +			mux->clk_nb.notifier_call = sg2042_mux_notifier_cb;
> +			ret = clk_notifier_register(hw->clk, &mux->clk_nb);
> +			if (ret) {
> +				pr_err("failed to register clock notifier for %s\n",
> +				       mux->hw.init->name);
> +				goto error_cleanup;
> +			}
> +		}
> +	}
> +
> +	return 0;
> +
> +error_cleanup:
> +	/* unregister notifier and release the memory allocated */
> +	for (i = 0; i < num_mux_clks; i++) {
> +		mux = &mux_clks[i];
> +
> +		hw = clk_data->onecell_data.hws[mux->id];
> +
> +		if (hw)
> +			clk_notifier_unregister(hw->clk, &mux->clk_nb);
> +	}
> +
> +	/* leave clk unregister to outside if failed */
> +	return ret;
> +}
> +
> +static int sg2042_init_clkdata(struct platform_device *pdev,
> +			       int num_clks,
> +			       struct sg2042_clk_data **pp_clk_data)
> +{
> +	struct sg2042_clk_data *clk_data = NULL;
> +
> +	clk_data = devm_kzalloc(&pdev->dev,
> +				struct_size(clk_data, onecell_data.hws, num_clks),
> +				GFP_KERNEL);
> +	if (!clk_data)
> +		return -ENOMEM;
> +
> +	clk_data->iobase = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
> +	if (WARN_ON(IS_ERR(clk_data->iobase)))
> +		return PTR_ERR(clk_data->iobase);
> +
> +	clk_data->onecell_data.num = num_clks;
> +
> +	*pp_clk_data = clk_data;
> +
> +	return 0;
> +}
> +
> +static int sg2042_clkgen_probe(struct platform_device *pdev)
> +{
> +	struct sg2042_clk_data *clk_data = NULL;
> +	int i, ret = 0;
> +	int num_clks = 0;
> +
> +	num_clks = ARRAY_SIZE(sg2042_div_clks) +
> +		   ARRAY_SIZE(sg2042_gate_clks) +
> +		   ARRAY_SIZE(sg2042_mux_clks);
> +	if (num_clks == 0) {
> +		ret = -EINVAL;
> +		goto error_out;
> +	}
> +
> +	ret = sg2042_init_clkdata(pdev, num_clks, &clk_data);
> +	if (ret < 0)
> +		goto error_out;
> +
> +	ret = sg2042_clk_register_divs(clk_data, sg2042_div_clks,
> +				       ARRAY_SIZE(sg2042_div_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_clks,
> +					ARRAY_SIZE(sg2042_gate_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	ret = sg2042_clk_register_muxs(clk_data, sg2042_mux_clks,
> +				       ARRAY_SIZE(sg2042_mux_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	return devm_of_clk_add_hw_provider(&pdev->dev,
> +					   of_clk_hw_onecell_get,
> +					   &clk_data->onecell_data);
> +
> +cleanup:
> +	for (i = 0; i < num_clks; i++) {
> +		if (clk_data->onecell_data.hws[i])
> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
> +	}
> +
> +error_out:
> +	pr_err("%s failed error number %d\n", __func__, ret);
> +	return ret;
> +}
> +
> +static int sg2042_rpgate_probe(struct platform_device *pdev)
> +{
> +	struct sg2042_clk_data *clk_data = NULL;
> +	int i, ret = 0;
> +	int num_clks = 0;
> +
> +	num_clks = ARRAY_SIZE(sg2042_gate_rp);
> +	if (num_clks == 0) {
> +		ret = -EINVAL;
> +		goto error_out;
> +	}
> +
> +	ret = sg2042_init_clkdata(pdev, num_clks, &clk_data);
> +	if (ret < 0)
> +		goto error_out;
> +
> +	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_rp,
> +					ARRAY_SIZE(sg2042_gate_rp));
> +	if (ret)
> +		goto cleanup;
> +
> +	return devm_of_clk_add_hw_provider(&pdev->dev,
> +					   of_clk_hw_onecell_get,
> +					   &clk_data->onecell_data);
> +
> +cleanup:
> +	for (i = 0; i < num_clks; i++) {
> +		if (clk_data->onecell_data.hws[i])
> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
> +	}
> +
> +error_out:
> +	pr_err("%s failed error number %d\n", __func__, ret);
> +	return ret;
> +}
> +
> +static int sg2042_pll_probe(struct platform_device *pdev)
> +{
> +	struct sg2042_clk_data *clk_data = NULL;
> +	int i, ret = 0;
> +	int num_clks = 0;
> +
> +	num_clks = ARRAY_SIZE(sg2042_pll_clks);
> +	if (num_clks == 0) {
> +		ret = -EINVAL;
> +		goto error_out;
> +	}
> +
> +	ret = sg2042_init_clkdata(pdev, num_clks, &clk_data);
> +	if (ret < 0)
> +		goto error_out;
> +
> +	ret = sg2042_clk_register_plls(clk_data, sg2042_pll_clks,
> +				       ARRAY_SIZE(sg2042_pll_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	return devm_of_clk_add_hw_provider(&pdev->dev,
> +					   of_clk_hw_onecell_get,
> +					   &clk_data->onecell_data);
> +
> +cleanup:
> +	for (i = 0; i < num_clks; i++) {
> +		if (clk_data->onecell_data.hws[i])
> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
> +	}
> +
> +error_out:
> +	pr_err("%s failed error number %d\n", __func__, ret);
> +	return ret;
> +}
> +
> +static const struct of_device_id sg2042_clkgen_match[] = {
> +	{ .compatible = "sophgo,sg2042-clkgen" },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver sg2042_clkgen_driver = {
> +	.probe = sg2042_clkgen_probe,
> +	.driver = {
> +		.name = "clk-sophgo-sg2042-clkgen",
> +		.of_match_table = sg2042_clkgen_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +builtin_platform_driver(sg2042_clkgen_driver);
> +
> +static const struct of_device_id sg2042_rpgate_match[] = {
> +	{ .compatible = "sophgo,sg2042-rpgate" },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver sg2042_rpgate_driver = {
> +	.probe = sg2042_rpgate_probe,
> +	.driver = {
> +		.name = "clk-sophgo-sg2042-rpgate",
> +		.of_match_table = sg2042_rpgate_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +builtin_platform_driver(sg2042_rpgate_driver);
> +
> +static const struct of_device_id sg2042_pll_match[] = {
> +	{ .compatible = "sophgo,sg2042-pll" },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver sg2042_pll_driver = {
> +	.probe = sg2042_pll_probe,
> +	.driver = {
> +		.name = "clk-sophgo-sg2042-pll",
> +		.of_match_table = sg2042_pll_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +builtin_platform_driver(sg2042_pll_driver);
> diff --git a/drivers/clk/sophgo/clk-sophgo-sg2042.h b/drivers/clk/sophgo/clk-sophgo-sg2042.h
> new file mode 100644
> index 000000000000..407fec6f3f02
> --- /dev/null
> +++ b/drivers/clk/sophgo/clk-sophgo-sg2042.h
> @@ -0,0 +1,216 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef __CLK_SOPHGO_SG2042_H
> +#define __CLK_SOPHGO_SG2042_H
> +
> +/* Registers defined in SYS_CTRL */
> +#define R_PLL_BEGIN		0xC0
> +#define R_PLL_STAT		(0xC0 - R_PLL_BEGIN)
> +#define R_PLL_CLKEN_CONTROL	(0xC4 - R_PLL_BEGIN)
> +#define R_MPLL_CONTROL		(0xE8 - R_PLL_BEGIN)
> +#define R_FPLL_CONTROL		(0xF4 - R_PLL_BEGIN)
> +#define R_DPLL0_CONTROL		(0xF8 - R_PLL_BEGIN)
> +#define R_DPLL1_CONTROL		(0xFC - R_PLL_BEGIN)
> +
> +#define R_SYSGATE_BEGIN		0x0368
> +#define R_RP_RXU_CLK_ENABLE	(0x0368 - R_SYSGATE_BEGIN)
> +#define R_MP0_STATUS_REG	(0x0380 - R_SYSGATE_BEGIN)
> +#define R_MP0_CONTROL_REG	(0x0384 - R_SYSGATE_BEGIN)
> +#define R_MP1_STATUS_REG	(0x0388 - R_SYSGATE_BEGIN)
> +#define R_MP1_CONTROL_REG	(0x038C - R_SYSGATE_BEGIN)
> +#define R_MP2_STATUS_REG	(0x0390 - R_SYSGATE_BEGIN)
> +#define R_MP2_CONTROL_REG	(0x0394 - R_SYSGATE_BEGIN)
> +#define R_MP3_STATUS_REG	(0x0398 - R_SYSGATE_BEGIN)
> +#define R_MP3_CONTROL_REG	(0x039C - R_SYSGATE_BEGIN)
> +#define R_MP4_STATUS_REG	(0x03A0 - R_SYSGATE_BEGIN)
> +#define R_MP4_CONTROL_REG	(0x03A4 - R_SYSGATE_BEGIN)
> +#define R_MP5_STATUS_REG	(0x03A8 - R_SYSGATE_BEGIN)
> +#define R_MP5_CONTROL_REG	(0x03AC - R_SYSGATE_BEGIN)
> +#define R_MP6_STATUS_REG	(0x03B0 - R_SYSGATE_BEGIN)
> +#define R_MP6_CONTROL_REG	(0x03B4 - R_SYSGATE_BEGIN)
> +#define R_MP7_STATUS_REG	(0x03B8 - R_SYSGATE_BEGIN)
> +#define R_MP7_CONTROL_REG	(0x03BC - R_SYSGATE_BEGIN)
> +#define R_MP8_STATUS_REG	(0x03C0 - R_SYSGATE_BEGIN)
> +#define R_MP8_CONTROL_REG	(0x03C4 - R_SYSGATE_BEGIN)
> +#define R_MP9_STATUS_REG	(0x03C8 - R_SYSGATE_BEGIN)
> +#define R_MP9_CONTROL_REG	(0x03CC - R_SYSGATE_BEGIN)
> +#define R_MP10_STATUS_REG	(0x03D0 - R_SYSGATE_BEGIN)
> +#define R_MP10_CONTROL_REG	(0x03D4 - R_SYSGATE_BEGIN)
> +#define R_MP11_STATUS_REG	(0x03D8 - R_SYSGATE_BEGIN)
> +#define R_MP11_CONTROL_REG	(0x03DC - R_SYSGATE_BEGIN)
> +#define R_MP12_STATUS_REG	(0x03E0 - R_SYSGATE_BEGIN)
> +#define R_MP12_CONTROL_REG	(0x03E4 - R_SYSGATE_BEGIN)
> +#define R_MP13_STATUS_REG	(0x03E8 - R_SYSGATE_BEGIN)
> +#define R_MP13_CONTROL_REG	(0x03EC - R_SYSGATE_BEGIN)
> +#define R_MP14_STATUS_REG	(0x03F0 - R_SYSGATE_BEGIN)
> +#define R_MP14_CONTROL_REG	(0x03F4 - R_SYSGATE_BEGIN)
> +#define R_MP15_STATUS_REG	(0x03F8 - R_SYSGATE_BEGIN)
> +#define R_MP15_CONTROL_REG	(0x03FC - R_SYSGATE_BEGIN)
> +
> +/* Registers defined in CLOCK */
> +#define R_CLKENREG0		0x00
> +#define R_CLKENREG1		0x04
> +#define R_CLKSELREG0		0x20
> +#define R_CLKDIVREG0		0x40
> +#define R_CLKDIVREG1		0x44
> +#define R_CLKDIVREG2		0x48
> +#define R_CLKDIVREG3		0x4C
> +#define R_CLKDIVREG4		0x50
> +#define R_CLKDIVREG5		0x54
> +#define R_CLKDIVREG6		0x58
> +#define R_CLKDIVREG7		0x5C
> +#define R_CLKDIVREG8		0x60
> +#define R_CLKDIVREG9		0x64
> +#define R_CLKDIVREG10		0x68
> +#define R_CLKDIVREG11		0x6C
> +#define R_CLKDIVREG12		0x70
> +#define R_CLKDIVREG13		0x74
> +#define R_CLKDIVREG14		0x78
> +#define R_CLKDIVREG15		0x7C
> +#define R_CLKDIVREG16		0x80
> +#define R_CLKDIVREG17		0x84
> +#define R_CLKDIVREG18		0x88
> +#define R_CLKDIVREG19		0x8C
> +#define R_CLKDIVREG20		0x90
> +#define R_CLKDIVREG21		0x94
> +#define R_CLKDIVREG22		0x98
> +#define R_CLKDIVREG23		0x9C
> +#define R_CLKDIVREG24		0xA0
> +#define R_CLKDIVREG25		0xA4
> +#define R_CLKDIVREG26		0xA8
> +#define R_CLKDIVREG27		0xAC
> +#define R_CLKDIVREG28		0xB0
> +#define R_CLKDIVREG29		0xB4
> +#define R_CLKDIVREG30		0xB8
> +
> +/*
> + * Common data of clock-controller
> + * Note: this structure will be used both by clkgen & sysclk.
> + * @iobase: base address of clock-controller
> + * @onecell_data: used for adding providers.
> + */
> +struct sg2042_clk_data {
> +	void __iomem *iobase;
> +	struct clk_hw_onecell_data onecell_data;
> +};
> +
> +/*
> + * PLL clock
> + * @hw:				clk_hw for initialization
> + * @id:				used to map clk_onecell_data
> + * @base:			used for readl/writel.
> + *				**NOTE**: PLL registers are all in SYS_CTRL!
> + * @lock:			spinlock to protect register access, modification
> + *				of frequency can only be served one at the time.
> + * @offset_status:		offset of pll status registers
> + * @offset_enable:		offset of pll enable registers
> + * @offset_ctrl:		offset of pll control registers
> + * @shift_status_lock:		shift of XXX_LOCK in pll status register
> + * @shift_status_updating:	shift of UPDATING_XXX in pll status register
> + * @shift_enable:		shift of XXX_CLK_EN in pll enable register
> + */
> +struct sg2042_pll_clock {
> +	struct clk_hw hw;
> +
> +	unsigned int id;
> +	void __iomem *base;
> +	/* protect register access */
> +	spinlock_t *lock;
> +
> +	u32 offset_status;
> +	u32 offset_enable;
> +	u32 offset_ctrl;
> +	u8 shift_status_lock;
> +	u8 shift_status_updating;
> +	u8 shift_enable;
> +};
> +
> +#define to_sg2042_pll_clk(_hw) container_of(_hw, struct sg2042_pll_clock, hw)
> +
> +/*
> + * Divider clock
> + * @hw:			clk_hw for initialization
> + * @id:			used to map clk_onecell_data
> + * @reg:		used for readl/writel.
> + *			**NOTE**: DIV registers are ALL in CLOCK!
> + * @lock:		spinlock to protect register access, modification of
> + *			frequency can only be served one at the time
> + * @offset_ctrl:	offset of divider control registers
> + * @shift:		shift of "Clock Divider Factor" in divider control register
> + * @width:		width of "Clock Divider Factor" in divider control register
> + * @div_flags:		private flags for this clock, not for framework-specific
> + * @initval:		In the divider control register, we can configure whether
> + *			to use the value of "Clock Divider Factor" or just use
> + *			the initial value pre-configured by IC. BIT[3] controls
> + *			this and by default (value is 0), means initial value
> + *			is used.
> + *			**NOTE** that we cannot read the initial value (default
> + *			value when poweron) and default value of "Clock Divider
> + *			Factor" is zero, which I think is a hardware design flaw
> + *			and should be sync-ed with the initial value. So in
> + *			software we have to add a configuration item (initval)
> + *			to manually configure this value and use it when BIT[3]
> + *			is zero.
> + */
> +struct sg2042_divider_clock {
> +	struct clk_hw hw;
> +
> +	unsigned int id;
> +
> +	void __iomem *reg;
> +	/* protect register access */
> +	spinlock_t *lock;
> +
> +	unsigned long offset_ctrl;
> +	u8 shift;
> +	u8 width;
> +	u8 div_flags;
> +	u32 initval;
> +};
> +
> +#define to_sg2042_clk_divider(_hw)	\
> +	container_of(_hw, struct sg2042_divider_clock, hw)
> +
> +/*
> + * Gate clock
> + * @hw:			clk_hw for initialization
> + * @id:			used to map clk_onecell_data
> + * @offset_enable:	offset of gate enable registers
> + * @bit_idx:		which bit in the register controls gating of this clock
> + */
> +struct sg2042_gate_clock {
> +	struct clk_hw hw;
> +
> +	unsigned int id;
> +
> +	unsigned long offset_enable;
> +	u8 bit_idx;
> +};
> +
> +/*
> + * Mux clock
> + * @hw:			clk_hw for initialization
> + * @id:			used to map clk_onecell_data
> + * @offset_select:	offset of mux selection registers
> + *			**NOTE**: MUX registers are ALL in CLOCK!
> + * @shift:		shift of "Clock Select" in mux selection register
> + * @width:		width of "Clock Select" in mux selection register
> + * @clk_nb:		used for notification
> + * @original_index:	set by notifier callback
> + */
> +struct sg2042_mux_clock {
> +	struct clk_hw hw;
> +
> +	unsigned int id;
> +
> +	unsigned long offset_select;
> +	u8 shift;
> +	u8 width;
> +
> +	struct notifier_block clk_nb;
> +	u8 original_index;
> +};
> +
> +#define to_sg2042_mux_nb(_nb) container_of(_nb, struct sg2042_mux_clock, clk_nb)
> +
> +#endif /* __CLK_SOPHGO_SG2042_H */