drm/bridge: Support for Toshiba tc358768 RGB to DSI bridge

From:		Peter Ujfalusi <peter.ujfalusi-AT-ti.com>
To:		<airlied-AT-linux.ie>, <daniel-AT-ffwll.ch>, <robh+dt-AT-kernel.org>, <mark.rutland-AT-arm.com>, <a.hajda-AT-samsung.com>, <narmstrong-AT-baylibre.com>
Subject:		[PATCH v3 0/2] drm/bridge: Support for Toshiba tc358768 RGB to DSI bridge
Date:		Mon, 27 Jan 2020 12:56:32 +0200
Message-ID:		<20200127105634.7638-1-peter.ujfalusi@ti.com>
Cc:		<tomi.valkeinen-AT-ti.com>, <dri-devel-AT-lists.freedesktop.org>, <devicetree-AT-vger.kernel.org>, <linux-kernel-AT-vger.kernel.org>, <Laurent.pinchart-AT-ideasonboard.com>, <jonas-AT-kwiboo.se>, <jernej.skrabec-AT-siol.net>
Archive-link:		Article

Hi,

Changes since v2:
- Implement pre_enable and post_disbale callbacks and move code from enable and
  disable callbacks.
- hw_enable/disable is removed from tc358768_dsi_host_transfer()
- Defines for DSI_CONFW accesses
- breakout from the loops  (the check for it) is moved one level up in
  tc358768_calc_pll()

Changes since v1:
DT bindings document:
- Removed MaxItems for the regulators
- additionalProperties: false added to port@1

Driver:
- Year is now 2020
- Includes shorted
- The three letter members of the private struct documented 0 they are named as
  in the datasheet
- Error handling for the IO functions is following what sil-sii8620.c does
- regmap regcache is disabled along with refcache_sync() and volatile callback
  for regmap
- The hw enable and disable functions got separated
- Taken the suggested simplifactions from Andrzej for tc358768_calc_pll() and
  tc358768_dsi_host_transfer()
- The driver no longer stores the drm_display_mode, it relies on
  priv->bridge.encoder->crtc->state->adjusted_mode where it needs it
- tc358768_calc_pll() can be used for verification only to not modify the state
- refcounting added for hw enable state as a dsi transfer was shutting down the
  bridge when it was already enabled.

Tested on top of drm-next + LED backlight patches + DT patches on dra7-evm with
osd101t2045 (panel-simple) and osd101t2587 panel drivers.

Cover letter from v1:
TC358768 is a parallel RGB to MIPI DSI bridge.

The initial driver supports MIPI_DSI_MODE_VIDEO, MIPI_DSI_FMT_RGB888 and
only write is implemented for mipi_dsi_host_ops.transfer due to lack of hardware
where other modes can be tested.

Regards,
Peter
---
Peter Ujfalusi (2):
  dt-bindings: display: bridge: Add documentation for Toshiba tc358768
  drm/bridge: Add tc358768 driver

 .../display/bridge/toshiba,tc358768.yaml      |  158 +++
 drivers/gpu/drm/bridge/Kconfig                |   10 +
 drivers/gpu/drm/bridge/Makefile               |    1 +
 drivers/gpu/drm/bridge/tc358768.c             | 1040 +++++++++++++++++
 4 files changed, 1209 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358768.yaml
 create mode 100644 drivers/gpu/drm/bridge/tc358768.c

-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki