From 8913e1aea4b32a866343b14e565c62cec54f3f78 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Mon, 20 Dec 2021 11:28:22 +0100
Subject: [PATCH] drm/tegra: dpaux: Populate AUX bus
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 8cf5aeb9db6c6..201f5175ecfec 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 1f96e416fa082..d7a731d287d23 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -19,6 +19,7 @@
#include <linux/workqueue.h>
#include <drm/drm_dp_helper.h>
+#include <drm/drm_dp_aux_bus.h>
#include <drm/drm_panel.h>
#include "dp.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;
}
--
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