From: Markus Schneider-Pargmann <msp@baylibre.com>

This patch adds a embedded displayport driver for the MediaTek mt8195
SoC.

It supports the MT8195, the embedded DisplayPort units. It offers
DisplayPort 1.4 with up to 4 lanes.

The driver creates a child device for the phy. The child device will
never exist without the parent being active. As they are sharing a
register range, the parent passes a regmap pointer to the child so
that
both can work with the same register range. The phy driver sets
device
data that is read by the parent to get the phy device that can be
used
to control the phy properties.

This driver is based on an initial version by
Jitao shi [off-list ref]

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <redacted>
[Bo-Chen: Cleanup the drivers and modify comments from reviewers]
Signed-off-by: Bo-Chen Chen <redacted>
---
 drivers/gpu/drm/mediatek/Kconfig       |   10 +
 drivers/gpu/drm/mediatek/Makefile      |    1 +
 drivers/gpu/drm/mediatek/mtk_dp.c      | 2198
++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  543 ++++++
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |    3 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |    3 +
 6 files changed, 2758 insertions(+)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h

diff --git a/drivers/gpu/drm/mediatek/Kconfig

b/drivers/gpu/drm/mediatek/Kconfig
index 2976d21e9a34..6d3af73e7e8c 100644

--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig

@@ -15,12 +15,22 @@ config DRM_MEDIATEK
 	select MTK_SMI
 	select PHY_MTK_MIPI_DSI
 	select VIDEOMODE_HELPERS
+	select DRM_MEDIATEK_DP

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c

b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 78e79c8449c8..8023f1bd5f7e 100644

--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -1033,6 +1033,9 @@ static struct platform_driver * const

mtk_drm_drivers[] = {
 	&mtk_disp_ovl_driver,
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
+#if IS_REACHABLE(CONFIG_DRM_MEDIATEK_DP)
+	&mtk_dp_driver,
+#endif