Message-Id: <20210203071256.42050-1-jagan@amarulasolutions.com>
Date:   Wed,  3 Feb 2021 12:42:55 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-amarula@...rulasolutions.com,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: [PATCH v2 1/2] dt-bindings: display: bridge: Add documentation for SN65DSI84

SN65DSI84 is a Single Channel DSI to Dual-link LVDS bridge from
Texas Instruments.

SN65DSI83, SN65DSI85 are variants of the same family of bridge
controllers.

Right now the bridge driver is supporting a single link, dual-link
support requires to initiate I2C Channel B registers, so dt-bindings
documented with single link LVDS.

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
---
Changes for v2:
- none

 .../bindings/display/bridge/ti,sn65dsi84.yaml | 127 ++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml
new file mode 100644
index 000000000000..891382a76c1a
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml
@@ -0,0 +1,127 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/ti,sn65dsi84.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI SN65DSI84 MIPI DSI to LVDS bridge bindings
+
+maintainers:
+  - Jagan Teki <jagan@...rulasolutions.com>
+
+description: |
+  The SN65DSI84 DSI to FlatLink bridge features a single channel MIPI D-PHY receiver
+  front-end configuration with 4 lanes per channel operating at 1 Gbps per lanes.
+  The bridge decodes MIPI DSI 18bpp RGB666 and 240bpp RG888 packets and converts
+  the formatted video data stream to a FlatLink compatible LVDS output operating
+  at pixel clocks operating from 25 MHx to 154 MHz, offering a Dual-Link LVDS,
+  Single-Link LVDS interface with four data lanes per link.
+
+  https://www.ti.com/product/SN65DSI84
+
+properties:
+  compatible:
+    const: ti,sn65dsi84
+
+  reg:
+    maxItems: 1
+    description: i2c address of the bridge, 0x2c
+
+  enable-gpios:
+    maxItems: 1
+    description: GPIO specifier for bridge enable pin (active high).
+
+  ports:
+    type: object
+    description:
+      A node containing input and output port nodes with endpoint definitions
+      as documented in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      port@0:
+        type: object
+        description: |
+          DSI Input. The remote endpoint phandle should be a
+          reference to a valid mipi_dsi_host device node.
+
+      port@1:
+        type: object
+        description: |
+          Video port for LVDS output (panel or connector).
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - enable-gpios
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       ports {
+           #address-cells = <1>;
+           #size-cells = <0>;
+
+           port@0 {
+               reg = <0>;
+               dsi_in: endpoint {
+                   remote-endpoint = <&ltdc_ep0_out>;
+               };
+           };
+
+           port@1 {
+               reg = <1>;
+               dsi_out: endpoint {
+                   remote-endpoint = <&bridge_in>;
+                   data-lanes = <0 1>;
+               };
+           };
+       };
+    };
+
+    i2c6 {
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       bridge@2c {
+           compatible = "ti,sn65dsi84";
+           reg = <0x2c>;
+           enable-gpios = <&gpiof 15 GPIO_ACTIVE_HIGH>;
+
+           ports {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               port@0 {
+                   reg = <0>;
+                   bridge_in: endpoint {
+                        remote-endpoint = <&dsi_out>;
+                   };
+               };
+
+               port@1 {
+                   reg = <1>;
+                   bridge_out: endpoint {
+                        remote-endpoint = <&panel_in_lvds>;
+                   };
+               };
+           };
+       };
+    };
-- 
2.25.1

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