Re: [PATCH 1/2] drm/tegra: dpaux: Populate AUX bus

[Dmitry Osipenko <digetx@gmail.com>]

20.12.2021 13:48, Thierry Reding пишет:
> From: Thierry Reding <treding@nvidia.com>
> 
> The DPAUX hardware block exposes an DP AUX interface that provides
> access to an AUX bus and the devices on that bus. Use the DP AUX bus
> infrastructure that was recently introduced to probe devices on this
> bus from DT.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  drivers/gpu/drm/tegra/Kconfig | 1 +
>  drivers/gpu/drm/tegra/dpaux.c | 7 +++++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
> index 8cf5aeb9db6c..201f5175ecfe 100644
> --- a/drivers/gpu/drm/tegra/Kconfig
> +++ b/drivers/gpu/drm/tegra/Kconfig
> @@ -5,6 +5,7 @@ config DRM_TEGRA
>  	depends on COMMON_CLK
>  	depends on DRM
>  	depends on OF
> +	select DRM_DP_AUX_BUS
>  	select DRM_KMS_HELPER
>  	select DRM_MIPI_DSI
>  	select DRM_PANEL
> diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
> index 1f96e416fa08..9da1edcdc835 100644
> --- a/drivers/gpu/drm/tegra/dpaux.c
> +++ b/drivers/gpu/drm/tegra/dpaux.c
> @@ -18,6 +18,7 @@
>  #include <linux/reset.h>
>  #include <linux/workqueue.h>
>  
> +#include <drm/drm_dp_aux_bus.h>
>  #include <drm/drm_dp_helper.h>
>  #include <drm/drm_panel.h>
>  
> @@ -570,6 +571,12 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
>  	list_add_tail(&dpaux->list, &dpaux_list);
>  	mutex_unlock(&dpaux_lock);
>  
> +	err = devm_of_dp_aux_populate_ep_devices(&dpaux->aux);
> +	if (err < 0) {
> +		dev_err(dpaux->dev, "failed to populate AUX bus: %d\n", err);
> +		return err;
> +	}
> +
>  	return 0;
>  }

Needs stable tag for 5.15+.