linux-kernel - Re: [PATCH v1 2/2] clk: qcom: Add Global Clock controller (GCC) driver for SC7280

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Message-ID: <a70505c8-9d29-463f-99bb-b5c046ee8da3@codeaurora.org>
Date:   Wed, 10 Feb 2021 23:54:02 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh@...nel.org, robh+dt@...nel.org
Subject: Re: [PATCH v1 2/2] clk: qcom: Add Global Clock controller (GCC)
 driver for SC7280

Thanks Stephen for your review comments.

On 1/13/2021 1:34 AM, Stephen Boyd wrote:

>> +
>> +static struct clk_rcg2 gcc_sdcc1_apps_clk_src = {
>> +       .cmd_rcgr = 0x7500c,
>> +       .mnd_width = 8,
>> +       .hid_width = 5,
>> +       .parent_map = gcc_parent_map_8,
>> +       .freq_tbl = ftbl_gcc_sdcc1_apps_clk_src,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gcc_sdcc1_apps_clk_src",
>> +               .parent_data = gcc_parent_data_8,
>> +               .num_parents = ARRAY_SIZE(gcc_parent_data_8),
>> +               .flags = CLK_SET_RATE_PARENT,
>> +               .ops = &clk_rcg2_ops,
> 
> This needs to use floor clk ops?
> 

My bad I missed them in my patch, latest patch has this fixed.

>> +       },
>> +};
>> +
>> +static const struct freq_tbl ftbl_gcc_sdcc1_ice_core_clk_src[] = {
>> +       F(100000000, P_GCC_GPLL0_OUT_EVEN, 3, 0, 0),
>> +       F(150000000, P_GCC_GPLL0_OUT_EVEN, 2, 0, 0),
>> +       F(300000000, P_GCC_GPLL0_OUT_EVEN, 1, 0, 0),
>> +       { }
>> +};
>> +
>> +static struct clk_rcg2 gcc_sdcc1_ice_core_clk_src = {
>> +       .cmd_rcgr = 0x7502c,
>> +       .mnd_width = 0,
>> +       .hid_width = 5,
>> +       .parent_map = gcc_parent_map_1,
>> +       .freq_tbl = ftbl_gcc_sdcc1_ice_core_clk_src,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gcc_sdcc1_ice_core_clk_src",
>> +               .parent_data = gcc_parent_data_1,
>> +               .num_parents = ARRAY_SIZE(gcc_parent_data_1),
>> +               .flags = CLK_SET_RATE_PARENT,
>> +               .ops = &clk_rcg2_ops,
> 
> Same.
> 
>> +       },
>> +};
>> +
>> +static const struct freq_tbl ftbl_gcc_sdcc2_apps_clk_src[] = {
>> +       F(400000, P_BI_TCXO, 12, 1, 4),
>> +       F(19200000, P_BI_TCXO, 1, 0, 0),
>> +       F(25000000, P_GCC_GPLL0_OUT_EVEN, 12, 0, 0),
>> +       F(50000000, P_GCC_GPLL0_OUT_EVEN, 6, 0, 0),
>> +       F(100000000, P_GCC_GPLL0_OUT_EVEN, 3, 0, 0),
>> +       F(202000000, P_GCC_GPLL9_OUT_MAIN, 4, 0, 0),
>> +       { }
>> +};
>> +
>> +static struct clk_rcg2 gcc_sdcc2_apps_clk_src = {
>> +       .cmd_rcgr = 0x1400c,
>> +       .mnd_width = 8,
>> +       .hid_width = 5,
>> +       .parent_map = gcc_parent_map_9,
>> +       .freq_tbl = ftbl_gcc_sdcc2_apps_clk_src,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gcc_sdcc2_apps_clk_src",
>> +               .parent_data = gcc_parent_data_9,
>> +               .num_parents = ARRAY_SIZE(gcc_parent_data_9),
>> +               .flags = CLK_SET_RATE_PARENT,
>> +               .ops = &clk_rcg2_ops,
> 
> Same.
> 
>> +       },
>> +};
>> +
>> +static const struct freq_tbl ftbl_gcc_sdcc4_apps_clk_src[] = {
>> +       F(400000, P_BI_TCXO, 12, 1, 4),
>> +       F(19200000, P_BI_TCXO, 1, 0, 0),
>> +       F(25000000, P_GCC_GPLL0_OUT_EVEN, 12, 0, 0),
>> +       F(50000000, P_GCC_GPLL0_OUT_EVEN, 6, 0, 0),
>> +       F(100000000, P_GCC_GPLL0_OUT_EVEN, 3, 0, 0),
>> +       { }
>> +};
>> +
>> +static struct clk_rcg2 gcc_sdcc4_apps_clk_src = {
>> +       .cmd_rcgr = 0x1600c,
>> +       .mnd_width = 8,
>> +       .hid_width = 5,
>> +       .parent_map = gcc_parent_map_1,
>> +       .freq_tbl = ftbl_gcc_sdcc4_apps_clk_src,
>> +       .clkr.hw.init = &(struct clk_init_data){
>> +               .name = "gcc_sdcc4_apps_clk_src",
>> +               .parent_data = gcc_parent_data_1,
>> +               .num_parents = ARRAY_SIZE(gcc_parent_data_1),
>> +               .flags = CLK_SET_RATE_PARENT,
>> +               .ops = &clk_rcg2_ops,
> 
> Same.
> 
>> +       },
>> +};
>> +
> [...]
>> +static struct clk_branch gcc_cpuss_ahb_clk = {
>> +       .halt_reg = 0x48000,
>> +       .halt_check = BRANCH_HALT_VOTED,
>> +       .hwcg_reg = 0x48000,
>> +       .hwcg_bit = 1,
>> +       .clkr = {
>> +               .enable_reg = 0x52000,
>> +               .enable_mask = BIT(21),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "gcc_cpuss_ahb_clk",
>> +                       .parent_data = &(const struct clk_parent_data){
>> +                               .hw = &gcc_cpuss_ahb_postdiv_clk_src.clkr.hw,
>> +                       },
>> +                       .num_parents = 1,
>> +                       .flags = CLK_IS_CRITICAL | CLK_SET_RATE_PARENT,
> 
> Why is it critical? Please add a comment like sc7180.
> 

Updated the comment in the latest patch.

>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +

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