linux-kernel - [PATCH v4 0/3] drm: Add support for Cadence MHDP DPI/DP bridge and J721E wrapper.

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Message-ID: <1580970588-21596-1-git-send-email-yamonkar@cadence.com>
Date:   Thu, 6 Feb 2020 07:29:45 +0100
From:   Yuti Amonkar <yamonkar@...ence.com>
To:     <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <robh+dt@...nel.org>,
        <maxime@...no.tech>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <mark.rutland@....com>, <a.hajda@...sung.com>,
        <narmstrong@...libre.com>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...l.net>
CC:     <praneeth@...com>, <jsarha@...com>, <tomi.valkeinen@...com>,
        <mparab@...ence.com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>
Subject: [PATCH v4 0/3] drm: Add support for Cadence MHDP DPI/DP bridge and J721E wrapper.

This patch series adds new DRM driver for Cadence Display Port.
The Cadence Display Port is also referred as MHDP (Mobile High
Definition Link, High-Definition Multimedia Interface Display
Port) Cadence Display Port complies with VESA DisplayPort (DP)
and embedded Display Port (eDP) standards. This driver implements
Single Stream Transport (SST) support. Adds Texas Instruments SoC
J721e specific wrapper and adds the device tree bindings in YAML format.

The patch series has three patches which applies the changes in the below sequence
1. 001-dt-bindings-drm-bridge-Document-Cadence-MHDP-bridge-bindings
Documents the bindings in yaml format.
2. 002-drm-bridge-Add-support-for-Cadence-MHDP-bridge
This patch adds new DRM driver for Cadence MHDP Display Port. The patch implements supports
for single stream transport mode.
3. 003-drm-bridge-cdns-mhdp-add-j721e-wrapper
Add Texas Instruments (TI) j721e wrapper for mhdp. The wrapper configures mhdp clocks
and muxes as required by SoC.

Version History:

v4:
- Added SPDX dual license tag to YAML bindings.
- Corrected indentation of the child node properties.
- Removed the maxItems in the conditional statement.
- Removed phy-names property from the bindings.
- Add Reviewed-by: Rob Herring <robh@...nel.org> tag to the
  "Document Cadence MHDP bridge bindings" patch.
- Renamed the DRM driver executable name from mhdp8546 to cdns-mhdp in Makefile.
- Renamed the DRM driver and header file from cdns-mhdp to cdns-mhdp-core.

v3:
- Added if / then clause to validate that the reg length is proper
  based on the value of the compatible property.
- Updated phy property description in YAML to a generic one.
- Renamed num_lanes and max_bit_rate property strings to cdns,num-lanes 
  and cdns,max-bit-rate based on update in PHY series [2].

v2:
- Use enum in compatible property of YAML file.
- Add reg-names property to YAML file
- Add minItems and maxItems to reg property in YAML.
- Remove cdns_mhdp_link_probe function to remove
  duplication of reading dpcd capabilities.

This patch series is dependent on PHY DisplayPort configuration patch [1]

[1]

https://lkml.org/lkml/2020/1/6/279

[2]

https://lkml.org/lkml/2020/2/6/15

Yuti Amonkar (3):
  dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings.
  drm: bridge: Add support for Cadence MHDP DPI/DP bridge
  drm: bridge: cdns-mhdp: add j721e wrapper

 .../bindings/display/bridge/cdns,mhdp.yaml    |  125 +
 drivers/gpu/drm/bridge/Kconfig                |   23 +
 drivers/gpu/drm/bridge/Makefile               |    6 +
 drivers/gpu/drm/bridge/cdns-mhdp-core.c       | 2220 +++++++++++++++++
 drivers/gpu/drm/bridge/cdns-mhdp-core.h       |  381 +++
 drivers/gpu/drm/bridge/cdns-mhdp-j721e.c      |   79 +
 drivers/gpu/drm/bridge/cdns-mhdp-j721e.h      |   55 +
 7 files changed, 2889 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/cdns,mhdp.yaml
 create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-core.c
 create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-core.h
 create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-j721e.c
 create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-j721e.h

-- 
2.20.1