linux-kernel - Re: [PATCH v2] clk: qcom: gcc-sc8280xp: add cxo as parent for three ufs ref clks

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Date:   Tue, 15 Nov 2022 13:08:11 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Shazad Hussain <quic_shazhuss@...cinc.com>
Cc:     andersson@...nel.org, sboyd@...nel.org, bmasney@...hat.com,
        agross@...nel.org, mturquette@...libre.com,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: qcom: gcc-sc8280xp: add cxo as parent for three
 ufs ref clks

On Tue, Nov 15, 2022 at 03:52:17PM +0530, Shazad Hussain wrote:
> Added parent_data as CXO for three UFS reference clocks named,
> gcc_ufs_ref_clkref_clk, gcc_ufs_card_clkref_clk and
> gcc_ufs_1_card_clkref_clk.

The commit message should explain why this is needed rather than just
state what is being done. For example, something along the lines of

	The three UFS reference clocks gcc_ufs_ref_clkref_clk,
	gcc_ufs_card_clkref_clk and gcc_ufs_1_card_clkref_clk are all
	sourced from CXO.

	Update the clock driver to describe this.

should do.

> Fixes: d65d005f9a6c ("clk: qcom: add sc8280xp GCC driver")
> Link: https://lore.kernel.org/lkml/Y2Tber39cHuOSR%2FW@hovoldconsulting.com/
> Signed-off-by: Shazad Hussain <quic_shazhuss@...cinc.com>

Tested-by: Johan Hovold <johan+linaro@...nel.org>

And with a tweaked commit message you can also add:

Reviewed-by: Johan Hovold <johan+linaro@...nel.org>

>---
> Changes since v1:
> - Renamed patch subject. Did not include Brian's T-b comment.
> - Added parent data for two ufs phy ref clocks.
> 
> v1 of this patch can be found at
> https://lore.kernel.org/all/20221030142333.31019-1-quic_shazhuss@quicinc.com/
> 
> used below patches for verification on next-20221114
> https://lore.kernel.org/lkml/20221104092045.17410-2-johan+linaro@kernel.org/
> https://lore.kernel.org/lkml/20221104092045.17410-3-johan+linaro@kernel.org/
> https://lore.kernel.org/lkml/20221111113732.461881-1-thierry.reding@gmail.com/
> 
>  drivers/clk/qcom/gcc-sc8280xp.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/clk/qcom/gcc-sc8280xp.c b/drivers/clk/qcom/gcc-sc8280xp.c
> index a18ed88f3b82..b3198784e1c3 100644
> --- a/drivers/clk/qcom/gcc-sc8280xp.c
> +++ b/drivers/clk/qcom/gcc-sc8280xp.c
> @@ -5364,6 +5364,8 @@ static struct clk_branch gcc_ufs_1_card_clkref_clk = {
>  		.enable_mask = BIT(0),
>  		.hw.init = &(const struct clk_init_data) {
>  			.name = "gcc_ufs_1_card_clkref_clk",
> +			.parent_data = &gcc_parent_data_tcxo,
> +			.num_parents = 1,
>  			.ops = &clk_branch2_ops,
>  		},
>  	},
> @@ -5432,6 +5434,8 @@ static struct clk_branch gcc_ufs_card_clkref_clk = {
>  		.enable_mask = BIT(0),
>  		.hw.init = &(const struct clk_init_data) {
>  			.name = "gcc_ufs_card_clkref_clk",
> +			.parent_data = &gcc_parent_data_tcxo,
> +			.num_parents = 1,
>  			.ops = &clk_branch2_ops,
>  		},
>  	},
> @@ -5848,6 +5852,8 @@ static struct clk_branch gcc_ufs_ref_clkref_clk = {
>  		.enable_mask = BIT(0),
>  		.hw.init = &(const struct clk_init_data) {
>  			.name = "gcc_ufs_ref_clkref_clk",
> +			.parent_data = &gcc_parent_data_tcxo,
> +			.num_parents = 1,
>  			.ops = &clk_branch2_ops,
>  		},
>  	},

Johan