[PATCH RFC 4/8] drm: msm: update to use component match support

[Rob Clark]

On Sat, Apr 26, 2014 at 7:02 PM, Russell King
<rmk+kernel at arm.linux.org.uk> wrote:
> Update MSM's DRM driver to use the component match support rather than
> add_components.

Looks like the component helper improvements make things nicer for the
driver.  Let me know when you are ready to merge the set, if you want
me to take this one via my tree or not.

Reviewed-by: Rob Clark <robdclark at gmail.com>

> Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
> ---
>  drivers/gpu/drm/msm/msm_drv.c | 81 ++++++++++++++++++-------------------------
>  1 file changed, 34 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index f9de156b9e65..26be58bd611d 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -865,12 +865,41 @@ static int compare_of(struct device *dev, void *data)
>  {
>         return dev->of_node == data;
>  }
> +#else
> +static int compare_dev(struct device *dev, void *data)
> +{
> +       return dev == data;
> +}
> +#endif
> +
> +static int msm_drm_bind(struct device *dev)
> +{
> +       return drm_platform_init(&msm_driver, to_platform_device(dev));
> +}
> +
> +static void msm_drm_unbind(struct device *dev)
> +{
> +       drm_put_dev(platform_get_drvdata(to_platform_device(dev)));
> +}
> +
> +static const struct component_master_ops msm_drm_ops = {
> +       .bind = msm_drm_bind,
> +       .unbind = msm_drm_unbind,
> +};
> +
> +/*
> + * Platform driver:
> + */
>
> -static int msm_drm_add_components(struct device *master, struct master *m)
> +static int msm_pdev_probe(struct platform_device *pdev)
>  {
> +       struct component_match *match = NULL;
> +#ifdef CONFIG_OF
> +       /* NOTE: the CONFIG_OF case duplicates the same code as exynos or imx
> +        * (or probably any other).. so probably some room for some helpers
> +        */
>         struct device_node *np = master->of_node;
>         unsigned i;
> -       int ret;
>
>         for (i = 0; ; i++) {
>                 struct device_node *node;
> @@ -879,22 +908,9 @@ static int msm_drm_add_components(struct device *master, struct master *m)
>                 if (!node)
>                         break;
>
> -               ret = component_master_add_child(m, compare_of, node);
> -               of_node_put(node);
> -
> -               if (ret)
> -                       return ret;
> +               component_match_add(&pdev->dev, &match, compare_of, node);
>         }
> -       return 0;
> -}
>  #else
> -static int compare_dev(struct device *dev, void *data)
> -{
> -       return dev == data;
> -}
> -
> -static int msm_drm_add_components(struct device *master, struct master *m)
> -{
>         /* For non-DT case, it kinda sucks.  We don't actually have a way
>          * to know whether or not we are waiting for certain devices (or if
>          * they are simply not present).  But for non-DT we only need to
> @@ -918,41 +934,12 @@ static int msm_drm_add_components(struct device *master, struct master *m)
>                         return -EPROBE_DEFER;
>                 }
>
> -               ret = component_master_add_child(m, compare_dev, dev);
> -               if (ret) {
> -                       DBG("could not add child: %d", ret);
> -                       return ret;
> -               }
> +               component_match_add(&pdev->dev, &match, compare_dev, dev);
>         }
> -
> -       return 0;
> -}
>  #endif
>
> -static int msm_drm_bind(struct device *dev)
> -{
> -       return drm_platform_init(&msm_driver, to_platform_device(dev));
> -}
> -
> -static void msm_drm_unbind(struct device *dev)
> -{
> -       drm_put_dev(platform_get_drvdata(to_platform_device(dev)));
> -}
> -
> -static const struct component_master_ops msm_drm_ops = {
> -               .add_components = msm_drm_add_components,
> -               .bind = msm_drm_bind,
> -               .unbind = msm_drm_unbind,
> -};
> -
> -/*
> - * Platform driver:
> - */
> -
> -static int msm_pdev_probe(struct platform_device *pdev)
> -{
>         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> -       return component_master_add(&pdev->dev, &msm_drm_ops);
> +       return component_master_add_with_match(&pdev->dev, &msm_drm_ops, match);
>  }
>
>  static int msm_pdev_remove(struct platform_device *pdev)
> --
> 1.8.3.1
>