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Subject[PATCH v9 08/11] drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus
Date
We want to provide our panel with access to the DP AUX channel. The
way to do this is to let our panel be a child of ours using the fancy
new DP AUX bus support.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
---

Changes in v9:
- Rebased atop v9 ("Promote the AUX channel") patch.

Changes in v7:
- Patch to support for DP AUX bus on ti-sn65dsi86 new for v7.

drivers/gpu/drm/bridge/Kconfig | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++
2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index c96e4b38d1d3..5e1e28d4520f 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -293,6 +293,7 @@ config DRM_TI_SN65DSI86
select DRM_PANEL
select DRM_MIPI_DSI
select AUXILIARY_BUS
+ select DRM_DP_AUX_BUS
help
Texas Instruments SN65DSI86 DSI to eDP Bridge driver

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 8e61005cf4ad..32bd35c98d95 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -23,6 +23,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
+#include <drm/drm_dp_aux_bus.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
@@ -1426,12 +1427,17 @@ static int ti_sn_aux_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
+ int ret;

pdata->aux.name = "ti-sn65dsi86-aux";
pdata->aux.dev = &adev->dev;
pdata->aux.transfer = ti_sn_aux_transfer;
drm_dp_aux_init(&pdata->aux);

+ ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux);
+ if (ret)
+ return ret;
+
/*
* The eDP to MIPI bridge parts don't work until the AUX channel is
* setup so we don't add it in the main driver probe, we add it now.
--
2.32.0.rc1.229.g3e70b5a671-goog
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