20.12.2021 13:48, Thierry Reding пишет:
> From: Thierry Reding <tred...@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 <tred...@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+.
