linux-kernel - Re: [PATCH v4 02/12] clk: qcom: Use qcom_branch_set_clk

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Date: Tue, 2 Jan 2024 11:35:46 +0100
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: 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>,
	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,
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v4 02/12] clk: qcom: Use qcom_branch_set_clk_en()

On Sat, Dec 30, 2023 at 02:04:04PM +0100, Konrad Dybcio wrote:
> Instead of magically poking at the bit0 of branch clocks' CBCR, use
> the newly introduced helper.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---

> diff --git a/drivers/clk/qcom/camcc-sc8280xp.c b/drivers/clk/qcom/camcc-sc8280xp.c
> index 3dcd79b01515..94db130b85e2 100644
> --- a/drivers/clk/qcom/camcc-sc8280xp.c
> +++ b/drivers/clk/qcom/camcc-sc8280xp.c
> @@ -3010,10 +3010,8 @@ static int camcc_sc8280xp_probe(struct platform_device *pdev)
>  	clk_lucid_pll_configure(&camcc_pll6, regmap, &camcc_pll6_config);
>  	clk_lucid_pll_configure(&camcc_pll7, regmap, &camcc_pll7_config);
>  
> -	/*
> -	 * Keep camcc_gdsc_clk always enabled:
> -	 */
> -	regmap_update_bits(regmap, 0xc1e4, BIT(0), 1);
> +	/* Keep the critical clocks always-on */
> +	qcom_branch_set_clk_en(regmap, 0xc1e4); /* CAMCC_GDSC_CLK */

I still think something along the lines of

	/* Keep some clocks always on */

is preferred as it is far from obvious why a camera clock would be
considered "critical".

Or perhaps you can come up with a better description of why we've
decided not to model these clocks and just leave them ungated.

>  
>  	ret = qcom_cc_really_probe(pdev, &camcc_sc8280xp_desc, regmap);
>  	if (ret)

Johan