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Subject: Re: [PATCH 4/6] clk: qcom: Add ipq6018 Global Clock Controller
 support
To:     Stephen Boyd <sboyd@kernel.org>, agross@kernel.org,
        devicetree@vger.kernel.org, linus.walleij@linaro.org,
        linux-arm-kernel@lists.infradead.org,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-soc@vger.kernel.org, robh+dt@kernel.org
References: <1559755738-28643-1-git-send-email-sricharan@codeaurora.org>
 <1559755738-28643-5-git-send-email-sricharan@codeaurora.org>
 <20190610152205.1EC24207E0@mail.kernel.org>
From:   Sricharan R <sricharan@codeaurora.org>
Message-ID: <a0212a93-c790-1535-4531-3112e2fa27fb@codeaurora.org>
Date:   Thu, 19 Dec 2019 15:56:18 +0530
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Hi Stephen,
  Sorry for the late response, started looking in to this again.

On 6/10/2019 8:52 PM, Stephen Boyd wrote:
> Quoting Sricharan R (2019-06-05 10:28:56)
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index e1ff83c..e5fb091 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -120,6 +120,15 @@ config IPQ_GCC_8074
>>           i2c, USB, SD/eMMC, etc. Select this for the root clock
>>           of ipq8074.
>>  
>> +config IPQ_GCC_6018
>> +       tristate "IPQ6018 Global Clock Controller"
>> +       depends on COMMON_CLK_QCOM
> 
> Not sure I commented on this, but this should be removed. The whole
> thing is inside an if now.
> 

 ok, will change.

>> +       help
>> +         Support for global clock controller on ipq6018 devices.
>> +         Say Y if you want to use peripheral devices such as UART, SPI,
>> +         i2c, USB, SD/eMMC, etc. Select this for the root clock
>> +         of ipq6018.
>> +
>>  config MSM_GCC_8660
>>         tristate "MSM8660 Global Clock Controller"
>>         help
>> diff --git a/drivers/clk/qcom/gcc-ipq6018.c b/drivers/clk/qcom/gcc-ipq6018.c
>> new file mode 100644
>> index 0000000..9f4552b
>> --- /dev/null
>> +++ b/drivers/clk/qcom/gcc-ipq6018.c
>> @@ -0,0 +1,5267 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/regmap.h>
>> +
>> +#include <linux/reset-controller.h>
>> +#include <dt-bindings/clock/qcom,gcc-ipq6018.h>
>> +
>> +#include "common.h"
>> +#include "clk-regmap.h"
>> +#include "clk-pll.h"
>> +#include "clk-rcg.h"
>> +#include "clk-branch.h"
>> +#include "clk-alpha-pll.h"
>> +#include "clk-regmap-divider.h"
>> +#include "clk-regmap-mux.h"
>> +#include "reset.h"
>> +
>> +#define F(f, s, h, m, n) { (f), (s), (2 * (h) - 1), (m), (n) }
> [...]
>> +
>> +static struct clk_alpha_pll gpll0_main = {
>> +       .offset = 0x21000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_DEFAULT],
>> +       .clkr = {
>> +               .enable_reg = 0x0b000,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gpll0_main",
>> +                       .parent_names = (const char *[]){
>> +                               "xo"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_alpha_pll_ops,
>> +                       .flags = CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 

 Need not be critical, will remove it here and in
 rest of the places as well.

>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_fixed_factor gpll0_out_main_div2 = {
>> +       .mult = 1,
>> +       .div = 2,
>> +       .hw.init = &(struct clk_init_data){
>> +               .name = "gpll0_out_main_div2",
>> +               .parent_names = (const char *[]){
>> +                       "gpll0_main"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_fixed_factor_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll_postdiv gpll0 = {
>> +       .offset = 0x21000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_DEFAULT],
>> +       .width = 4,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gpll0",
>> +               .parent_names = (const char *[]){
>> +                       "gpll0_main"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_alpha_pll_postdiv_ro_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll ubi32_pll_main = {
>> +       .offset = 0x25000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_HUAYRA],
>> +       .flags = SUPPORTS_DYNAMIC_UPDATE,
>> +       .clkr = {
>> +               .enable_reg = 0x0b000,
>> +               .enable_mask = BIT(6),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "ubi32_pll_main",
>> +                       .parent_names = (const char *[]){
>> +                               "xo"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_alpha_pll_huayra_ops,
>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll_postdiv ubi32_pll = {
>> +       .offset = 0x25000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_HUAYRA],
>> +       .width = 2,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "ubi32_pll",
>> +               .parent_names = (const char *[]){
>> +                       "ubi32_pll_main"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_alpha_pll_postdiv_ro_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll gpll6_main = {
>> +       .offset = 0x37000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_BRAMMO],
>> +       .clkr = {
>> +               .enable_reg = 0x0b000,
>> +               .enable_mask = BIT(7),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gpll6_main",
>> +                       .parent_names = (const char *[]){
>> +                               "xo"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_alpha_pll_ops,
>> +                       .flags = CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll_postdiv gpll6 = {
>> +       .offset = 0x37000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_BRAMMO],
>> +       .width = 2,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gpll6",
>> +               .parent_names = (const char *[]){
>> +                       "gpll6_main"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_alpha_pll_postdiv_ro_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll gpll4_main = {
>> +       .offset = 0x24000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_DEFAULT],
>> +       .clkr = {
>> +               .enable_reg = 0x0b000,
>> +               .enable_mask = BIT(5),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gpll4_main",
>> +                       .parent_names = (const char *[]){
>> +                               "xo"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_alpha_pll_ops,
>> +                       .flags = CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll_postdiv gpll4 = {
>> +       .offset = 0x24000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_DEFAULT],
>> +       .width = 4,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gpll4",
>> +               .parent_names = (const char *[]){
>> +                       "gpll4_main"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_alpha_pll_postdiv_ro_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static const struct freq_tbl ftbl_pcnoc_bfdcd_clk_src[] = {
>> +       F(24000000, P_XO, 1, 0, 0),
>> +       F(50000000, P_GPLL0, 16, 0, 0),
>> +       F(100000000, P_GPLL0, 8, 0, 0),
>> +       { }
>> +};
>> +
>> +static struct clk_rcg2 pcnoc_bfdcd_clk_src = {
>> +       .cmd_rcgr = 0x27000,
>> +       .freq_tbl = ftbl_pcnoc_bfdcd_clk_src,
>> +       .hid_width = 5,
>> +       .parent_map = gcc_xo_gpll0_gpll0_out_main_div2_map,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "pcnoc_bfdcd_clk_src",
>> +               .parent_names = gcc_xo_gpll0_gpll0_out_main_div2,
>> +               .num_parents = 3,
>> +               .ops = &clk_rcg2_ops,
>> +               .flags = CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +       },
>> +};
>> +
>> +static struct clk_fixed_factor pcnoc_clk_src = {
>> +       .mult = 1,
>> +       .div = 1,
>> +       .hw.init = &(struct clk_init_data){
>> +               .name = "pcnoc_clk_src",
>> +               .parent_names = (const char *[]){
>> +                       "pcnoc_bfdcd_clk_src"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_fixed_factor_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
>> +
>> +static struct clk_alpha_pll gpll2_main = {
>> +       .offset = 0x4a000,
>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_DEFAULT],
>> +       .clkr = {
>> +               .enable_reg = 0x0b000,
>> +               .enable_mask = BIT(2),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gpll2_main",
>> +                       .parent_names = (const char *[]){
>> +                               "xo"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_alpha_pll_ops,
>> +                       .flags = CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +               },
>> +       },
>> +};
>> +
> [...]
>> +
>> +static struct clk_fixed_factor system_noc_clk_src = {
>> +       .mult = 1,
>> +       .div = 1,
>> +       .hw.init = &(struct clk_init_data){
>> +               .name = "system_noc_clk_src",
>> +               .parent_names = (const char *[]){
>> +                       "system_noc_bfdcd_clk_src"
>> +               },
>> +               .num_parents = 1,
>> +               .ops = &clk_fixed_factor_ops,
>> +               .flags = CLK_SET_RATE_PARENT,
>> +       },
>> +};
> 
> What is the point of these fixed factor 1/1 clks? Just to rename things?
> Does it matter, or can we just specify system_noc_bfdcd_clk_src as the
> parent and drop this intermediate clk?
> 

  ok, will remove it.

>> +
>> +static struct clk_branch gcc_sleep_clk_src = {
>> +       .halt_reg = 0x30000,
>> +       .clkr = {
>> +               .enable_reg = 0x30000,
>> +               .enable_mask = BIT(1),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_sleep_clk_src",
>> +                       .parent_names = (const char *[]){
>> +                               "sleep_clk"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .ops = &clk_branch2_ops,
>> +                       .flags = CLK_IS_CRITICAL,
>> +               },
>> +       },
>> +};
>> +
> [...]
>> +
>> +static struct clk_branch gcc_qdss_at_clk = {
>> +       .halt_reg = 0x29024,
>> +       .clkr = {
>> +               .enable_reg = 0x29024,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_qdss_at_clk",
>> +                       .parent_names = (const char *[]){
>> +                               "qdss_at_clk_src"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_branch gcc_qdss_dap_clk = {
>> +       .halt_reg = 0x29084,
>> +       .clkr = {
>> +               .enable_reg = 0x29084,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_qdss_dap_clk",
>> +                       .parent_names = (const char *[]){
>> +                               "qdss_dap_sync_clk_src"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> 
> Can you add a comment on why this is critical?
> 
>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +
>> +static struct clk_branch gcc_qpic_ahb_clk = {
>> +       .halt_reg = 0x57024,
>> +       .clkr = {
>> +               .enable_reg = 0x57024,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_qpic_ahb_clk",
>> +                       .parent_names = (const char *[]){
>> +                               "pcnoc_clk_src"
>> +                       },
>> +                       .num_parents = 1,
>> +                       .flags = CLK_SET_RATE_PARENT,
>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +
> [...]
>> +static struct clk_branch gcc_dcc_clk = {
>> +       .halt_reg = 0x77004,
>> +       .clkr = {
>> +               .enable_reg = 0x77004,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_dcc_clk",
>> +                       .parent_names = (const char *[]){
>> +                               "pcnoc_clk_src"
>> +                       },
> 
> Can you use the new method of specifying clk parents here? That will
> make this simpler.
> 

 ok, will use it.

>> +                       .num_parents = 1,
>> +                       .flags = CLK_SET_RATE_PARENT,
>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +
>> +static const struct alpha_pll_config ubi32_pll_config = {
>> +       .l = 0x3e,
>> +       .alpha = 0x57,
>> +       .config_ctl_val = 0x200d6aa8,
>> +       .config_ctl_hi_val = 0x3c2,
>> +       .main_output_mask = BIT(0),
>> +       .aux_output_mask = BIT(1),
>> +       .pre_div_val = 0x0,
>> +       .pre_div_mask = BIT(12),
>> +       .post_div_val = 0x0,
>> +       .post_div_mask = GENMASK(9, 8),
>> +};
>> +
>> +static const struct alpha_pll_config nss_crypto_pll_config = {
>> +       .l = 0x32,
>> +       .alpha = 0x0,
>> +       .alpha_hi = 0x0,
>> +       .config_ctl_val = 0x4001055b,
>> +       .main_output_mask = BIT(0),
>> +       .pre_div_val = 0x0,
>> +       .pre_div_mask = GENMASK(14, 12),
>> +       .post_div_val = 0x1 << 8,
>> +       .post_div_mask = GENMASK(11, 8),
>> +       .vco_mask = GENMASK(21, 20),
>> +       .vco_val = 0x0,
>> +       .alpha_en_mask = BIT(24),
>> +};
>> +
>> +static struct clk_hw *gcc_ipq6018_hws[] = {
> 
> It would be nice to trim this down to a list of 0.
> 
>> +       &gpll0_out_main_div2.hw,
>> +       &pcnoc_clk_src.hw,
>> +       &snoc_nssnoc_clk_src.hw,
>> +       &system_noc_clk_src.hw,
>> +       &gcc_xo_div4_clk_src.hw,
>> +       &ubi32_mem_noc_clk_src.hw,
>> +       &nss_ppe_cdiv_clk_src.hw,
>> +       &gpll6_out_main_div2.hw,
> 
> Why do we need this? Does anyone use it?
> 

   Yes, will remove the fixed factor 1/1 parents from this list.
   But other div clks are still required.

Regards,
 Sricharan
    

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