linux-kernel - Re: [PATCH v6 2/5] clk: imx: clk-audiomix: Add reset controller

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Message-ID: <20240530085115.ttmzx4dve4x6nep2@pengutronix.de>
Date: Thu, 30 May 2024 10:51:15 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: p.zabel@...gutronix.de, abelvesa@...nel.org, peng.fan@....com,
	mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	marex@...x.de, linux-clk@...r.kernel.org, imx@...ts.linux.dev,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, shengjiu.wang@...il.com
Subject: Re: [PATCH v6 2/5] clk: imx: clk-audiomix: Add reset controller

On 24-05-30, Shengjiu Wang wrote:
> Audiomix block control can be a reset controller for
> Enhanced Audio Return Channel (EARC), which is one of
> modules in this audiomix subsystem.
> 
> The reset controller is supported by the auxiliary device
> framework.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/clk/imx/Kconfig               |  1 +
>  drivers/clk/imx/clk-imx8mp-audiomix.c | 60 +++++++++++++++++++++++++++
>  2 files changed, 61 insertions(+)
> 
> diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
> index 6da0fba68225..9edfb030bea9 100644
> --- a/drivers/clk/imx/Kconfig
> +++ b/drivers/clk/imx/Kconfig
> @@ -81,6 +81,7 @@ config CLK_IMX8MP
>  	tristate "IMX8MP CCM Clock Driver"
>  	depends on ARCH_MXC || COMPILE_TEST
>  	select MXC_CLK
> +	select AUXILIARY_BUS
>  	help
>  	    Build the driver for i.MX8MP CCM Clock Driver
>  
> diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-imx8mp-audiomix.c
> index b381d6f784c8..a3dc2f3606ee 100644
> --- a/drivers/clk/imx/clk-imx8mp-audiomix.c
> +++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
> @@ -5,6 +5,7 @@
>   * Copyright (C) 2022 Marek Vasut <marex@...x.de>
>   */
>  
> +#include <linux/auxiliary_bus.h>
>  #include <linux/clk-provider.h>
>  #include <linux/device.h>
>  #include <linux/io.h>
> @@ -13,6 +14,7 @@
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/slab.h>
>  
>  #include <dt-bindings/clock/imx8mp-clock.h>
>  
> @@ -217,6 +219,60 @@ struct clk_imx8mp_audiomix_priv {
>  	struct clk_hw_onecell_data clk_data;
>  };
>  
> +#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
> +
> +static void clk_imx8mp_audiomix_reset_unregister_adev(void *_adev)
> +{
> +	struct auxiliary_device *adev = _adev;
> +
> +	auxiliary_device_delete(adev);
> +	auxiliary_device_uninit(adev);
> +}
> +
> +static void clk_imx8mp_audiomix_reset_adev_release(struct device *dev)
> +{
> +	struct auxiliary_device *adev = to_auxiliary_dev(dev);
> +
> +	kfree(adev);
> +}
> +
> +static int clk_imx8mp_audiomix_reset_controller_register(struct device *dev,
> +							 struct clk_imx8mp_audiomix_priv *priv)
> +{
> +	struct auxiliary_device *adev __free(kfree) = NULL;
> +	int ret;

Since the reset-controller is optional you need to check the existence
of the '#reset-cells' property before you register it.

Regards,
  Marco

> +
> +	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
> +	if (!adev)
> +		return -ENOMEM;
> +
> +	adev->name = "reset";
> +	adev->dev.parent = dev;
> +	adev->dev.release = clk_imx8mp_audiomix_reset_adev_release;
> +
> +	ret = auxiliary_device_init(adev);
> +	if (ret)
> +		return ret;
> +
> +	ret = auxiliary_device_add(adev);
> +	if (ret) {
> +		auxiliary_device_uninit(adev);
> +		return ret;
> +	}
> +
> +	return devm_add_action_or_reset(dev, clk_imx8mp_audiomix_reset_unregister_adev,
> +					no_free_ptr(adev));
> +}
> +
> +#else /* !CONFIG_RESET_CONTROLLER */
> +
> +static int clk_imx8mp_audiomix_reset_controller_register(struct clk_imx8mp_audiomix_priv *priv)
> +{
> +	return 0;
> +}
> +
> +#endif /* !CONFIG_RESET_CONTROLLER */
> +
>  static void clk_imx8mp_audiomix_save_restore(struct device *dev, bool save)
>  {
>  	struct clk_imx8mp_audiomix_priv *priv = dev_get_drvdata(dev);
> @@ -337,6 +393,10 @@ static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_clk_register;
>  
> +	ret = clk_imx8mp_audiomix_reset_controller_register(dev, priv);
> +	if (ret)
> +		goto err_clk_register;
> +
>  	pm_runtime_put_sync(dev);
>  	return 0;
>  
> -- 
> 2.34.1
> 
> 
>