linux-kernel - Re: [PATCH v6 01/12] clk: qcom: branch: Add a helper for setting the enable bit

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Date: Tue, 23 Jan 2024 15:03:03 +0530
From: Imran Shaik <quic_imrashai@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: Marijn Suijten <marijn.suijten@...ainline.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Johan Hovold
	<johan+linaro@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v6 01/12] clk: qcom: branch: Add a helper for setting the
 enable bit



On 1/13/2024 8:20 PM, Konrad Dybcio wrote:
> We hardcode some clocks to be always-on, as they're essential to the
> functioning of the SoC / some peripherals. Add a helper to do so
> to make the writes less magic.
> 
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/clk/qcom/clk-branch.h | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
> index 8ffed603c050..0514bc43100b 100644
> --- a/drivers/clk/qcom/clk-branch.h
> +++ b/drivers/clk/qcom/clk-branch.h
> @@ -64,6 +64,7 @@ struct clk_mem_branch {
>   #define CBCR_FORCE_MEM_PERIPH_OFF	BIT(12)
>   #define CBCR_WAKEUP			GENMASK(11, 8)
>   #define CBCR_SLEEP			GENMASK(7, 4)
> +#define CBCR_CLOCK_ENABLE		BIT(0)
>   
>   static inline void qcom_branch_set_force_mem_core(struct regmap *regmap,
>   						  struct clk_branch clk, bool on)
> @@ -98,6 +99,12 @@ static inline void qcom_branch_set_sleep(struct regmap *regmap, struct clk_branc
>   			   FIELD_PREP(CBCR_SLEEP, val));
>   }
>   
> +static inline void qcom_branch_set_clk_en(struct regmap *regmap, u32 cbcr)
> +{
> +	regmap_update_bits(regmap, cbcr, CBCR_CLOCK_ENABLE,
> +			   CBCR_CLOCK_ENABLE);
> +}
> +

Could you please help me understand how this helper function is useful?
Seems like this is just for reducing parameters compared to 
regmap_update_bits(). But anyhow the same is being done in the existing
clock controller drivers with a comment which explains the functionality.

Thanks & Regards,
Imran

>   extern const struct clk_ops clk_branch_ops;
>   extern const struct clk_ops clk_branch2_ops;
>   extern const struct clk_ops clk_branch_simple_ops;
>