linux-kernel - Re: [PATCH v4 2/2] cpufreq: tegra124: Allow building as a module

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Message-ID: <da080e61-4e54-4334-a239-1619bf8fea0c@nvidia.com>
Date: Wed, 14 May 2025 11:31:55 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: webgeek1234@...il.com, "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Thierry Reding <thierry.reding@...il.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-tegra@...r.kernel.org
Subject: Re: [PATCH v4 2/2] cpufreq: tegra124: Allow building as a module


On 09/05/2025 01:04, Aaron Kling via B4 Relay wrote:
> From: Aaron Kling <webgeek1234@...il.com>
> 
> This requires three changes:
> * A soft dependency on cpufreq-dt as this driver only handles power
>    management and cpufreq-dt does the real operations
> * Adding a remove routine to remove the cpufreq-dt device
> * Adding a exit routine to handle cleaning up the driver
> 
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
>   drivers/cpufreq/Kconfig.arm        |  2 +-
>   drivers/cpufreq/tegra124-cpufreq.c | 36 ++++++++++++++++++++++++++++++++----
>   2 files changed, 33 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index 4f9cb943d945c244eb2b29f543d14df6cac4e5d4..625f6fbdaaf5fd774e3b0bb996eb7ce980da41ee 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -238,7 +238,7 @@ config ARM_TEGRA20_CPUFREQ
>   	  This adds the CPUFreq driver support for Tegra20/30 SOCs.
>   
>   config ARM_TEGRA124_CPUFREQ
> -	bool "Tegra124 CPUFreq support"
> +	tristate "Tegra124 CPUFreq support"
>   	depends on ARCH_TEGRA || COMPILE_TEST
>   	depends on CPUFREQ_DT
>   	default y
> diff --git a/drivers/cpufreq/tegra124-cpufreq.c b/drivers/cpufreq/tegra124-cpufreq.c
> index bc0691e8971f9454def37f489e4a3e244100b9f4..b6059c91f2474c56809c403eca94eacf51df734f 100644
> --- a/drivers/cpufreq/tegra124-cpufreq.c
> +++ b/drivers/cpufreq/tegra124-cpufreq.c
> @@ -16,6 +16,8 @@
>   #include <linux/pm_opp.h>
>   #include <linux/types.h>
>   
> +static struct platform_device *platform_device;
> +
>   struct tegra124_cpufreq_priv {
>   	struct clk *cpu_clk;
>   	struct clk *pllp_clk;
> @@ -176,6 +178,21 @@ static int __maybe_unused tegra124_cpufreq_resume(struct device *dev)
>   	return err;
>   }
>   
> +static void tegra124_cpufreq_remove(struct platform_device *pdev)
> +{
> +	struct tegra124_cpufreq_priv *priv = dev_get_drvdata(&pdev->dev);
> +
> +	if (!IS_ERR(priv->cpufreq_dt_pdev)) {
> +		platform_device_unregister(priv->cpufreq_dt_pdev);
> +		priv->cpufreq_dt_pdev = ERR_PTR(-ENODEV);
> +	}
> +
> +	clk_put(priv->pllp_clk);
> +	clk_put(priv->pllx_clk);
> +	clk_put(priv->dfll_clk);
> +	clk_put(priv->cpu_clk);


If we use devm_clk_get() in probe, then we should be able to avoid this.

Jon

-- 
nvpublic