Subject: Re: [PATCH v10 2/6] clk: hisilicon: add CRG driver for hi3519 soc
To: <sboyd@codeaurora.org>
References: <1457403618-18317-1-git-send-email-xuejiancheng@huawei.com>
 <1457403618-18317-3-git-send-email-xuejiancheng@huawei.com>
CC: <mturquette@baylibre.com>, <p.zabel@pengutronix.de>, <robh+dt@kernel.org>,
        <pawel.moll@arm.com>, <mark.rutland@arm.com>,
        <ijc+devicetree@hellion.org.uk>, <galak@codeaurora.org>,
        <linux@arm.linux.org.uk>, <khilman@linaro.org>, <arnd@arndb.de>,
        <olof@lixom.net>, <xuwei5@hisilicon.com>, <haojian.zhuang@linaro.org>,
        <zhangfei.gao@linaro.org>, <bintian.wang@huawei.com>,
        <linux-kernel@vger.kernel.org>, <linux-clk@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
        <yanhaifeng@hisilicon.com>, <yanghongwei@hisilicon.com>,
        <suwenping@hisilicon.com>, <raojun@hisilicon.com>,
        <ml.yang@hisilicon.com>, <gaofei@hisilicon.com>,
        <zhangzhenxing@hisilicon.com>, <xuejiancheng@hisilicon.com>,
        <lidongpo@hisilicon.com>
From: Jiancheng Xue <xuejiancheng@huawei.com>
Message-ID: <56F4EDB4.80207@huawei.com>
Date: Fri, 25 Mar 2016 15:50:12 +0800
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Hi Stephen,
    I haven't received any comments for two weeks. Can you help me to ack this patch?
    Thank you very much.

Regards,
Jiancheng

On 2016/3/8 10:20, Jiancheng Xue wrote:
> The CRG(Clock and Reset Generator) block provides clock
> and reset signals for other modules in hi3519 soc.
> 
> Signed-off-by: Jiancheng Xue <xuejiancheng@huawei.com>
> Acked-by: Rob Herring <robh@kernel.org>
> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
>  .../devicetree/bindings/clock/hi3519-crg.txt       |  46 ++++++++
>  drivers/clk/hisilicon/Kconfig                      |  15 +++
>  drivers/clk/hisilicon/Makefile                     |   2 +
>  drivers/clk/hisilicon/clk-hi3519.c                 | 129 +++++++++++++++++++++
>  drivers/clk/hisilicon/reset.c                      | 124 ++++++++++++++++++++
>  drivers/clk/hisilicon/reset.h                      |  32 +++++
>  include/dt-bindings/clock/hi3519-clock.h           |  40 +++++++
>  7 files changed, 388 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/hi3519-crg.txt
>  create mode 100644 drivers/clk/hisilicon/clk-hi3519.c
>  create mode 100644 drivers/clk/hisilicon/reset.c
>  create mode 100644 drivers/clk/hisilicon/reset.h
>  create mode 100644 include/dt-bindings/clock/hi3519-clock.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/hi3519-crg.txt b/Documentation/devicetree/bindings/clock/hi3519-crg.txt
> new file mode 100644
> index 0000000..acd1f23
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/hi3519-crg.txt
> @@ -0,0 +1,46 @@
> +* Hisilicon Hi3519 Clock and Reset Generator(CRG)
> +
> +The Hi3519 CRG module provides clock and reset signals to various
> +controllers within the SoC.
> +
> +This binding uses the following bindings:
> +    Documentation/devicetree/bindings/clock/clock-bindings.txt
> +    Documentation/devicetree/bindings/reset/reset.txt
> +
> +Required Properties:
> +
> +- compatible: should be one of the following.
> +  - "hisilicon,hi3519-crg" - controller compatible with Hi3519 SoC.
> +
> +- reg: physical base address of the controller and length of memory mapped
> +  region.
> +
> +- #clock-cells: should be 1.
> +
> +Each clock is assigned an identifier and client nodes use this identifier
> +to specify the clock which they consume.
> +
> +All these identifier could be found in <dt-bindings/clock/hi3519-clock.h>.
> +
> +- #reset-cells: should be 2.
> +
> +A reset signal can be controlled by writing a bit register in the CRG module.
> +The reset specifier consists of two cells. The first cell represents the
> +register offset relative to the base address. The second cell represents the
> +bit index in the register.
> +
> +Example: CRG nodes
> +CRG: clock-reset-controller@12010000 {
> +	compatible = "hisilicon,hi3519-crg";
> +	reg = <0x12010000 0x10000>;
> +	#clock-cells = <1>;
> +	#reset-cells = <2>;
> +};
> +
> +Example: consumer nodes
> +i2c0: i2c@12110000 {
> +	compatible = "hisilicon,hi3519-i2c";
> +	reg = <0x12110000 0x1000>;
> +	clocks = <&CRG HI3519_I2C0_RST>;
> +	resets = <&CRG 0xe4 0>;
> +};
> diff --git a/drivers/clk/hisilicon/Kconfig b/drivers/clk/hisilicon/Kconfig
> index e434854..3f537a0 100644
> --- a/drivers/clk/hisilicon/Kconfig
> +++ b/drivers/clk/hisilicon/Kconfig
> @@ -1,3 +1,11 @@
> +config COMMON_CLK_HI3519
> +	tristate "Hi3519 Clock Driver"
> +	depends on ARCH_HISI || COMPILE_TEST
> +	select RESET_HISI
> +	default ARCH_HISI
> +	help
> +	  Build the clock driver for hi3519.
> +
>  config COMMON_CLK_HI6220
>  	bool "Hi6220 Clock Driver"
>  	depends on ARCH_HISI || COMPILE_TEST
> @@ -5,6 +13,13 @@ config COMMON_CLK_HI6220
>  	help
>  	  Build the Hisilicon Hi6220 clock driver based on the common clock framework.
>  
> +config RESET_HISI
> +	bool "HiSilicon Reset Controller Driver"
> +	depends on ARCH_HISI || COMPILE_TEST
> +	select RESET_CONTROLLER
> +	help
> +	  Build reset controller driver for HiSilicon device chipsets.
> +
>  config STUB_CLK_HI6220
>  	bool "Hi6220 Stub Clock Driver"
>  	depends on COMMON_CLK_HI6220 && MAILBOX
> diff --git a/drivers/clk/hisilicon/Makefile b/drivers/clk/hisilicon/Makefile
> index 74dba31..e169ec7 100644
> --- a/drivers/clk/hisilicon/Makefile
> +++ b/drivers/clk/hisilicon/Makefile
> @@ -7,5 +7,7 @@ obj-y	+= clk.o clkgate-separated.o clkdivider-hi6220.o
>  obj-$(CONFIG_ARCH_HI3xxx)	+= clk-hi3620.o
>  obj-$(CONFIG_ARCH_HIP04)	+= clk-hip04.o
>  obj-$(CONFIG_ARCH_HIX5HD2)	+= clk-hix5hd2.o
> +obj-$(CONFIG_COMMON_CLK_HI3519)	+= clk-hi3519.o
>  obj-$(CONFIG_COMMON_CLK_HI6220)	+= clk-hi6220.o
> +obj-$(CONFIG_RESET_HISI)	+= reset.o
>  obj-$(CONFIG_STUB_CLK_HI6220)	+= clk-hi6220-stub.o
> diff --git a/drivers/clk/hisilicon/clk-hi3519.c b/drivers/clk/hisilicon/clk-hi3519.c
> new file mode 100644
> index 0000000..ee9df82
> --- /dev/null
> +++ b/drivers/clk/hisilicon/clk-hi3519.c
> @@ -0,0 +1,129 @@
> +/*
> + * Hi3519 Clock Driver
> + *
> + * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <dt-bindings/clock/hi3519-clock.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include "clk.h"
> +#include "reset.h"
> +
> +#define HI3519_INNER_CLK_OFFSET	64
> +#define HI3519_FIXED_24M	65
> +#define HI3519_FIXED_50M	66
> +#define HI3519_FIXED_75M	67
> +#define HI3519_FIXED_125M	68
> +#define HI3519_FIXED_150M	69
> +#define HI3519_FIXED_200M	70
> +#define HI3519_FIXED_250M	71
> +#define HI3519_FIXED_300M	72
> +#define HI3519_FIXED_400M	73
> +#define HI3519_FMC_MUX		74
> +
> +#define HI3519_NR_CLKS		128
> +
> +static const struct hisi_fixed_rate_clock hi3519_fixed_rate_clks[] = {
> +	{ HI3519_FIXED_24M, "24m", NULL, CLK_IS_ROOT, 24000000, },
> +	{ HI3519_FIXED_50M, "50m", NULL, CLK_IS_ROOT, 50000000, },
> +	{ HI3519_FIXED_75M, "75m", NULL, CLK_IS_ROOT, 75000000, },
> +	{ HI3519_FIXED_125M, "125m", NULL, CLK_IS_ROOT, 125000000, },
> +	{ HI3519_FIXED_150M, "150m", NULL, CLK_IS_ROOT, 150000000, },
> +	{ HI3519_FIXED_200M, "200m", NULL, CLK_IS_ROOT, 200000000, },
> +	{ HI3519_FIXED_250M, "250m", NULL, CLK_IS_ROOT, 250000000, },
> +	{ HI3519_FIXED_300M, "300m", NULL, CLK_IS_ROOT, 300000000, },
> +	{ HI3519_FIXED_400M, "400m", NULL, CLK_IS_ROOT, 400000000, },
> +};
> +
> +static const char *const fmc_mux_p[] = {
> +		"24m", "75m", "125m", "150m", "200m", "250m", "300m", "400m", };
> +static u32 fmc_mux_table[] = {0, 1, 2, 3, 4, 5, 6, 7};
> +
> +static const struct hisi_mux_clock hi3519_mux_clks[] = {
> +	{ HI3519_FMC_MUX, "fmc_mux", fmc_mux_p, ARRAY_SIZE(fmc_mux_p),
> +		CLK_SET_RATE_PARENT, 0xc0, 2, 3, 0, fmc_mux_table, },
> +};
> +
> +static const struct hisi_gate_clock hi3519_gate_clks[] = {
> +	{ HI3519_FMC_CLK, "clk_fmc", "fmc_mux",
> +		CLK_SET_RATE_PARENT, 0xc0, 1, 0, },
> +	{ HI3519_UART0_CLK, "clk_uart0", "24m",
> +		CLK_SET_RATE_PARENT, 0xe4, 20, 0, },
> +	{ HI3519_UART1_CLK, "clk_uart1", "24m",
> +		CLK_SET_RATE_PARENT, 0xe4, 21, 0, },
> +	{ HI3519_UART2_CLK, "clk_uart2", "24m",
> +		CLK_SET_RATE_PARENT, 0xe4, 22, 0, },
> +	{ HI3519_UART3_CLK, "clk_uart3", "24m",
> +		CLK_SET_RATE_PARENT, 0xe4, 23, 0, },
> +	{ HI3519_UART4_CLK, "clk_uart4", "24m",
> +		CLK_SET_RATE_PARENT, 0xe4, 24, 0, },
> +	{ HI3519_SPI0_CLK, "clk_spi0", "50m",
> +		CLK_SET_RATE_PARENT, 0xe4, 16, 0, },
> +	{ HI3519_SPI1_CLK, "clk_spi1", "50m",
> +		CLK_SET_RATE_PARENT, 0xe4, 17, 0, },
> +	{ HI3519_SPI2_CLK, "clk_spi2", "50m",
> +		CLK_SET_RATE_PARENT, 0xe4, 18, 0, },
> +};
> +
> +static int hi3519_clk_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct hisi_clock_data *clk_data;
> +
> +	clk_data = hisi_clk_init(np, HI3519_NR_CLKS);
> +	if (!clk_data)
> +		return -ENODEV;
> +
> +	hisi_clk_register_fixed_rate(hi3519_fixed_rate_clks,
> +				     ARRAY_SIZE(hi3519_fixed_rate_clks),
> +				     clk_data);
> +	hisi_clk_register_mux(hi3519_mux_clks, ARRAY_SIZE(hi3519_mux_clks),
> +					clk_data);
> +	hisi_clk_register_gate(hi3519_gate_clks,
> +			ARRAY_SIZE(hi3519_gate_clks), clk_data);
> +
> +	return hisi_reset_init(np);
> +}
> +
> +static const struct of_device_id hi3519_clk_match_table[] = {
> +	{ .compatible = "hisilicon,hi3519-crg" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, hi3519_clk_match_table);
> +
> +static struct platform_driver hi3519_clk_driver = {
> +	.probe          = hi3519_clk_probe,
> +	.driver         = {
> +		.name   = "hi3519-clk",
> +		.of_match_table = hi3519_clk_match_table,
> +	},
> +};
> +
> +static int __init hi3519_clk_init(void)
> +{
> +	return platform_driver_register(&hi3519_clk_driver);
> +}
> +core_initcall(hi3519_clk_init);
> +
> +static void __exit hi3519_clk_exit(void)
> +{
> +	platform_driver_unregister(&hi3519_clk_driver);
> +}
> +module_exit(hi3519_clk_exit);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("HiSilicon Hi3519 Clock Driver");
> diff --git a/drivers/clk/hisilicon/reset.c b/drivers/clk/hisilicon/reset.c
> new file mode 100644
> index 0000000..8035366
> --- /dev/null
> +++ b/drivers/clk/hisilicon/reset.c
> @@ -0,0 +1,124 @@
> +/*
> + * Hisilicon Reset Controller Driver
> + *
> + * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/of_address.h>
> +#include <linux/reset-controller.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#define	HISI_RESET_BIT_MASK	0x1f
> +#define	HISI_RESET_OFFSET_SHIFT	8
> +#define	HISI_RESET_OFFSET_MASK	0xffff00
> +
> +struct hisi_reset_controller {
> +	spinlock_t	lock;
> +	void __iomem	*membase;
> +	struct reset_controller_dev	rcdev;
> +};
> +
> +
> +#define to_hisi_reset_controller(rcdev)  \
> +	container_of(rcdev, struct hisi_reset_controller, rcdev)
> +
> +static int hisi_reset_of_xlate(struct reset_controller_dev *rcdev,
> +			const struct of_phandle_args *reset_spec)
> +{
> +	u32 offset;
> +	u8 bit;
> +
> +	if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
> +		return -EINVAL;
> +
> +	offset = (reset_spec->args[0] << HISI_RESET_OFFSET_SHIFT)
> +		& HISI_RESET_OFFSET_MASK;
> +	bit = reset_spec->args[1] & HISI_RESET_BIT_MASK;
> +	return (offset | bit);
> +}
> +
> +static int hisi_reset_assert(struct reset_controller_dev *rcdev,
> +			      unsigned long id)
> +{
> +	struct hisi_reset_controller *rstc = to_hisi_reset_controller(rcdev);
> +	unsigned long flags;
> +	u32 offset, reg;
> +	u8 bit;
> +
> +	offset = (id & HISI_RESET_OFFSET_MASK) >> HISI_RESET_OFFSET_SHIFT;
> +	bit = id & HISI_RESET_BIT_MASK;
> +
> +	spin_lock_irqsave(&rstc->lock, flags);
> +
> +	reg = readl(rstc->membase + offset);
> +	writel(reg | BIT(bit), rstc->membase + offset);
> +
> +	spin_unlock_irqrestore(&rstc->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int hisi_reset_deassert(struct reset_controller_dev *rcdev,
> +				unsigned long id)
> +{
> +	struct hisi_reset_controller *rstc = to_hisi_reset_controller(rcdev);
> +	unsigned long flags;
> +	u32 offset, reg;
> +	u8 bit;
> +
> +	offset = (id & HISI_RESET_OFFSET_MASK) >> HISI_RESET_OFFSET_SHIFT;
> +	bit = id & HISI_RESET_BIT_MASK;
> +
> +	spin_lock_irqsave(&rstc->lock, flags);
> +
> +	reg = readl(rstc->membase + offset);
> +	writel(reg & ~BIT(bit), rstc->membase + offset);
> +
> +	spin_unlock_irqrestore(&rstc->lock, flags);
> +
> +	return 0;
> +}
> +
> +static struct reset_control_ops hisi_reset_ops = {
> +	.assert		= hisi_reset_assert,
> +	.deassert	= hisi_reset_deassert,
> +};
> +
> +int hisi_reset_init(struct device_node *np)
> +{
> +	struct hisi_reset_controller *rstc;
> +
> +	rstc = kzalloc(sizeof(*rstc), GFP_KERNEL);
> +	if (!rstc)
> +		return -ENOMEM;
> +
> +	rstc->membase = of_iomap(np, 0);
> +	if (!rstc->membase)
> +		return -EINVAL;
> +
> +	spin_lock_init(&rstc->lock);
> +
> +	rstc->rcdev.owner = THIS_MODULE;
> +	rstc->rcdev.ops = &hisi_reset_ops;
> +	rstc->rcdev.of_node = np;
> +	rstc->rcdev.of_reset_n_cells = 2;
> +	rstc->rcdev.of_xlate = hisi_reset_of_xlate;
> +
> +	return reset_controller_register(&rstc->rcdev);
> +}
> +EXPORT_SYMBOL_GPL(hisi_reset_init);
> diff --git a/drivers/clk/hisilicon/reset.h b/drivers/clk/hisilicon/reset.h
> new file mode 100644
> index 0000000..ffad4d7
> --- /dev/null
> +++ b/drivers/clk/hisilicon/reset.h
> @@ -0,0 +1,32 @@
> +/*
> + * Copyright (c) 2015 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef	__HISI_RESET_H
> +#define	__HISI_RESET_H
> +
> +struct device_node;
> +
> +#ifdef CONFIG_RESET_CONTROLLER
> +int hisi_reset_init(struct device_node *np);
> +#else
> +static inline int hisi_reset_init(struct device_node *np)
> +{
> +	return 0;
> +}
> +#endif
> +
> +#endif	/* __HISI_RESET_H */
> diff --git a/include/dt-bindings/clock/hi3519-clock.h b/include/dt-bindings/clock/hi3519-clock.h
> new file mode 100644
> index 0000000..14f4d21
> --- /dev/null
> +++ b/include/dt-bindings/clock/hi3519-clock.h
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright (c) 2015 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef __DTS_HI3519_CLOCK_H
> +#define __DTS_HI3519_CLOCK_H
> +
> +#define HI3519_FMC_CLK			1
> +#define HI3519_SPI0_CLK			2
> +#define HI3519_SPI1_CLK			3
> +#define HI3519_SPI2_CLK			4
> +#define HI3519_UART0_CLK		5
> +#define HI3519_UART1_CLK		6
> +#define HI3519_UART2_CLK		7
> +#define HI3519_UART3_CLK		8
> +#define HI3519_UART4_CLK		9
> +#define HI3519_PWM_CLK			10
> +#define HI3519_DMA_CLK			11
> +#define HI3519_IR_CLK			12
> +#define HI3519_ETH_PHY_CLK		13
> +#define HI3519_ETH_MAC_CLK		14
> +#define HI3519_ETH_MACIF_CLK		15
> +#define HI3519_USB2_BUS_CLK		16
> +#define HI3519_USB2_PORT_CLK		17
> +#define HI3519_USB3_CLK			18
> +
> +#endif	/* __DTS_HI3519_CLOCK_H */
>