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@xxxxxxx>
> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> 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@xxxxxxx>
> */
>
> +#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
>
>
>
