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

[Shengjiu Wang <shengjiu.wang@gmail.com>]

On Thu, May 30, 2024 at 4:51 PM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> 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@nxp.com>
> > Reviewed-by: Frank Li <Frank.Li@nxp.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@denx.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.
>

ok, will add it.

best regards
Shengjiu Wang

> 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
> >
> >
> >