linux-kernel - Re: [PATCH v2 1/2] clk: qcom: camcc-sm6350: add pm

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Date:   Mon, 13 Feb 2023 23:30:27 +0100
From:   Luca Weiss <luca@...tu.xyz>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Luca Weiss <luca.weiss@...rphone.com>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/2] clk: qcom: camcc-sm6350: add pm_runtime support

On Montag, 13. Februar 2023 14:08:06 CET Luca Weiss wrote:
> Make sure that we can enable and disable the power domains used for
> camcc when the clocks are and aren't used.
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>

Apparently I messed up v2 too and had the wrong email in my git config. Will 
send a v3 to fix that as well...

> ---
>  drivers/clk/qcom/camcc-sm6350.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/camcc-sm6350.c
> b/drivers/clk/qcom/camcc-sm6350.c index acba9f99d960..dd65f3ef0857 100644
> --- a/drivers/clk/qcom/camcc-sm6350.c
> +++ b/drivers/clk/qcom/camcc-sm6350.c
> @@ -7,6 +7,8 @@
>  #include <linux/clk-provider.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_clock.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
> 
>  #include <dt-bindings/clock/qcom,sm6350-camcc.h>
> @@ -1869,6 +1871,19 @@ MODULE_DEVICE_TABLE(of, camcc_sm6350_match_table);
>  static int camcc_sm6350_probe(struct platform_device *pdev)
>  {
>  	struct regmap *regmap;
> +	int ret;
> +
> +	ret = devm_pm_runtime_enable(&pdev->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = devm_pm_clk_create(&pdev->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = pm_runtime_get(&pdev->dev);
> +	if (ret)
> +		return ret;
> 
>  	regmap = qcom_cc_map(pdev, &camcc_sm6350_desc);
>  	if (IS_ERR(regmap))
> @@ -1879,14 +1894,26 @@ static int camcc_sm6350_probe(struct platform_device
> *pdev) clk_agera_pll_configure(&camcc_pll2, regmap, &camcc_pll2_config);
> clk_fabia_pll_configure(&camcc_pll3, regmap, &camcc_pll3_config);
> 
> -	return qcom_cc_really_probe(pdev, &camcc_sm6350_desc, regmap);
> +	ret = qcom_cc_really_probe(pdev, &camcc_sm6350_desc, regmap);
> +	pm_runtime_put(&pdev->dev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Failed to register CAM CC 
clocks\n");
> +		return ret;
> +	}
> +
> +	return 0;
>  }
> 
> +static const struct dev_pm_ops camcc_pm_ops = {
> +	SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
> +};
> +
>  static struct platform_driver camcc_sm6350_driver = {
>  	.probe = camcc_sm6350_probe,
>  	.driver = {
>  		.name = "sm6350-camcc",
>  		.of_match_table = camcc_sm6350_match_table,
> +		.pm = &camcc_pm_ops,
>  	},
>  };