linux-kernel - Re: [PATCH v2 3/3] clk: qcom: camcc: Add camera clock controller driver for SC7180

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Date:   Tue, 13 Oct 2020 18:59:11 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Taniya Das <tdas@...eaurora.org>
Cc:     David Brown <david.brown@...aro.org>,
        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,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        robh@...nel.org, robh+dt@...nel.org,
        Taniya Das <tdas@...eaurora.org>
Subject: Re: [PATCH v2 3/3] clk: qcom: camcc: Add camera clock controller driver for SC7180

Quoting Taniya Das (2020-10-13 10:11:50)
> diff --git a/drivers/clk/qcom/camcc-sc7180.c b/drivers/clk/qcom/camcc-sc7180.c
> new file mode 100644
> index 0000000..e954d21
> --- /dev/null
> +++ b/drivers/clk/qcom/camcc-sc7180.c
> @@ -0,0 +1,1737 @@
[...]
> +
> +enum {
> +       P_BI_TCXO,
> +       P_CAM_CC_PLL0_OUT_EVEN,
> +       P_CAM_CC_PLL1_OUT_EVEN,
> +       P_CAM_CC_PLL2_OUT_AUX,
> +       P_CAM_CC_PLL2_OUT_EARLY,
> +       P_CAM_CC_PLL3_OUT_MAIN,
> +       P_CORE_BI_PLL_TEST_SE,
> +};
> +
> +static struct pll_vco agera_vco[] = {

Can this be const?

> +       { 600000000, 3300000000, 0 },
> +};
> +
> +static struct pll_vco fabia_vco[] = {

Can this be const?

> +       { 249600000, 2000000000, 0 },
> +};
> +
[...]
> +
> +static int cam_cc_sc7180_probe(struct platform_device *pdev)
> +{
> +       struct regmap *regmap;
> +       int ret;
> +
> +       pm_runtime_enable(&pdev->dev);
> +       ret = pm_clk_create(&pdev->dev);
> +       if (ret)
> +               return ret;
> +
> +       ret = pm_clk_add(&pdev->dev, "xo");
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "Failed to acquire XO clock\n");
> +               goto disable_pm_runtime;
> +       }
> +
> +       ret = pm_clk_add(&pdev->dev, "iface");
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "Failed to acquire iface clock\n");
> +               goto disable_pm_runtime;
> +       }
> +
> +       ret = pm_clk_runtime_resume(&pdev->dev);
> +       if (ret) {
> +               dev_err(&pdev->dev, "pm runtime resume failed\n");
> +               goto destroy_pm_clk;
> +       }
> +
> +       regmap = qcom_cc_map(pdev, &cam_cc_sc7180_desc);
> +       if (IS_ERR(regmap)) {
> +               ret = PTR_ERR(regmap);
> +               goto destroy_pm_clk;
> +       }
> +
> +       clk_fabia_pll_configure(&cam_cc_pll0, regmap, &cam_cc_pll0_config);
> +       clk_fabia_pll_configure(&cam_cc_pll1, regmap, &cam_cc_pll1_config);
> +       clk_agera_pll_configure(&cam_cc_pll2, regmap, &cam_cc_pll2_config);
> +       clk_fabia_pll_configure(&cam_cc_pll3, regmap, &cam_cc_pll3_config);
> +
> +       ret = qcom_cc_really_probe(pdev, &cam_cc_sc7180_desc, regmap);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to register CAM CC clocks\n");
> +               goto suspend_pm_runtime;

ret is non-zero here

> +       }
> +
> +suspend_pm_runtime:
> +       ret = pm_clk_runtime_suspend(&pdev->dev);

But then it is overwritten here.

> +       if (ret)
> +               dev_err(&pdev->dev, "pm runtime suspend failed\n");
> +
> +       return 0;

And we return 0 when there was a failure to probe the clks?

> +
> +destroy_pm_clk:
> +       pm_clk_destroy(&pdev->dev);
> +
> +disable_pm_runtime:
> +       pm_runtime_disable(&pdev->dev);
> +
> +       return ret;
> +}