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Date: Thu, 29 Oct 2020 14:32:54 +0530
From: Taniya Das <tdas@...eaurora.org>
To: Douglas Anderson <dianders@...omium.org>,
Stephen Boyd <sboyd@...nel.org>
Cc: David Brown <david.brown@...aro.org>,
Rajendra Nayak <rnayak@...eaurora.org>,
linux-soc@...r.kernel.org, Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Michael Turquette <mturquette@...libre.com>,
linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] clk: qcom: lpass-sc7180: Disentangle the two clock
devices
Reviewed-by: Taniya Das <tdas@...eaurora.org>
On 10/20/2020 4:19 AM, Douglas Anderson wrote:
> The sc7180 lpass clock driver manages two different devices. These
> two devices were tangled together, using one probe and a lookup to
> figure out the real probe. I think it's cleaner to really separate
> the probe for these two devices since they're really different things,
> just both managed by the same driver.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
> Note: this is now a 2-patch cleanup series with no actual bugfixes
> since the problem solved by patch #3 was better solved with:
>
> https://lore.kernel.org/r/20201017020137.1251319-1-sboyd@kernel.org
>
> Changes in v5:
> - Two blank lines inserted before "return" statements.
>
> Changes in v3:
> - ("clk: qcom: lpass-sc7180: Disentangle the two clock devices") new for v3.
>
> drivers/clk/qcom/lpasscorecc-sc7180.c | 103 ++++++++++++++++----------
> 1 file changed, 64 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/clk/qcom/lpasscorecc-sc7180.c b/drivers/clk/qcom/lpasscorecc-sc7180.c
> index 2d15e33ec837..1a3925badd7c 100644
> --- a/drivers/clk/qcom/lpasscorecc-sc7180.c
> +++ b/drivers/clk/qcom/lpasscorecc-sc7180.c
> @@ -366,12 +366,39 @@ static void lpass_pm_clk_destroy(void *data)
> pm_clk_destroy(data);
> }
>
> +static int lpass_create_pm_clks(struct platform_device *pdev)
> +{
> + int ret;
> +
> + pm_runtime_enable(&pdev->dev);
> + ret = devm_add_action_or_reset(&pdev->dev, lpass_pm_runtime_disable, &pdev->dev);
> + if (ret)
> + return ret;
> +
> + ret = pm_clk_create(&pdev->dev);
> + if (ret)
> + return ret;
> + ret = devm_add_action_or_reset(&pdev->dev, lpass_pm_clk_destroy, &pdev->dev);
> + if (ret)
> + return ret;
> +
> + ret = pm_clk_add(&pdev->dev, "iface");
> + if (ret < 0)
> + dev_err(&pdev->dev, "failed to acquire iface clock\n");
> +
> + return ret;
> +}
> +
> static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
> {
> const struct qcom_cc_desc *desc;
> struct regmap *regmap;
> int ret;
>
> + ret = lpass_create_pm_clks(pdev);
> + if (ret)
> + return ret;
> +
> lpass_core_cc_sc7180_regmap_config.name = "lpass_audio_cc";
> desc = &lpass_audio_hm_sc7180_desc;
> ret = qcom_cc_probe_by_index(pdev, 1, desc);
> @@ -402,6 +429,11 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
> static int lpass_hm_core_probe(struct platform_device *pdev)
> {
> const struct qcom_cc_desc *desc;
> + int ret;
> +
> + ret = lpass_create_pm_clks(pdev);
> + if (ret)
> + return ret;
>
> lpass_core_cc_sc7180_regmap_config.name = "lpass_hm_core";
> desc = &lpass_core_hm_sc7180_desc;
> @@ -409,55 +441,28 @@ static int lpass_hm_core_probe(struct platform_device *pdev)
> return qcom_cc_probe_by_index(pdev, 0, desc);
> }
>
> -static const struct of_device_id lpass_core_cc_sc7180_match_table[] = {
> +static const struct of_device_id lpass_hm_sc7180_match_table[] = {
> {
> .compatible = "qcom,sc7180-lpasshm",
> - .data = lpass_hm_core_probe,
> },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, lpass_hm_sc7180_match_table);
> +
> +static const struct of_device_id lpass_core_cc_sc7180_match_table[] = {
> {
> .compatible = "qcom,sc7180-lpasscorecc",
> - .data = lpass_core_cc_sc7180_probe,
> },
> { }
> };
> MODULE_DEVICE_TABLE(of, lpass_core_cc_sc7180_match_table);
>
> -static int lpass_core_sc7180_probe(struct platform_device *pdev)
> -{
> - int (*clk_probe)(struct platform_device *p);
> - int ret;
> -
> - pm_runtime_enable(&pdev->dev);
> - ret = devm_add_action_or_reset(&pdev->dev, lpass_pm_runtime_disable, &pdev->dev);
> - if (ret)
> - return ret;
> -
> - ret = pm_clk_create(&pdev->dev);
> - if (ret)
> - return ret;
> - ret = devm_add_action_or_reset(&pdev->dev, lpass_pm_clk_destroy, &pdev->dev);
> - if (ret)
> - return ret;
> -
> - ret = pm_clk_add(&pdev->dev, "iface");
> - if (ret < 0) {
> - dev_err(&pdev->dev, "failed to acquire iface clock\n");
> - return ret;
> - }
> -
> - clk_probe = of_device_get_match_data(&pdev->dev);
> - if (!clk_probe)
> - return -EINVAL;
> -
> - return clk_probe(pdev);
> -}
> -
> static const struct dev_pm_ops lpass_core_cc_pm_ops = {
> SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
> };
>
> static struct platform_driver lpass_core_cc_sc7180_driver = {
> - .probe = lpass_core_sc7180_probe,
> + .probe = lpass_core_cc_sc7180_probe,
> .driver = {
> .name = "lpass_core_cc-sc7180",
> .of_match_table = lpass_core_cc_sc7180_match_table,
> @@ -465,17 +470,37 @@ static struct platform_driver lpass_core_cc_sc7180_driver = {
> },
> };
>
> -static int __init lpass_core_cc_sc7180_init(void)
> +static const struct dev_pm_ops lpass_hm_pm_ops = {
> + SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
> +};
> +
> +static struct platform_driver lpass_hm_sc7180_driver = {
> + .probe = lpass_hm_core_probe,
> + .driver = {
> + .name = "lpass_hm-sc7180",
> + .of_match_table = lpass_hm_sc7180_match_table,
> + .pm = &lpass_hm_pm_ops,
> + },
> +};
> +
> +static int __init lpass_sc7180_init(void)
> {
> - return platform_driver_register(&lpass_core_cc_sc7180_driver);
> + int ret;
> +
> + ret = platform_driver_register(&lpass_core_cc_sc7180_driver);
> + if (ret)
> + return ret;
> +
> + return platform_driver_register(&lpass_hm_sc7180_driver);
> }
> -subsys_initcall(lpass_core_cc_sc7180_init);
> +subsys_initcall(lpass_sc7180_init);
>
> -static void __exit lpass_core_cc_sc7180_exit(void)
> +static void __exit lpass_sc7180_exit(void)
> {
> + platform_driver_unregister(&lpass_hm_sc7180_driver);
> platform_driver_unregister(&lpass_core_cc_sc7180_driver);
> }
> -module_exit(lpass_core_cc_sc7180_exit);
> +module_exit(lpass_sc7180_exit);
>
> MODULE_DESCRIPTION("QTI LPASS_CORE_CC SC7180 Driver");
> MODULE_LICENSE("GPL v2");
>
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