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

[Thierry Reding]

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;
 }
 
-- 
2.34.1