linux-kernel - [RFC PATCH 1/2] dt-bindings: display: xlnx: Add Xilinx DSI TX subsystem bindings

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Message-Id: <1587417656-48078-2-git-send-email-venkateshwar.rao.gannavarapu@xilinx.com>
Date:   Tue, 21 Apr 2020 02:50:55 +0530
From:   Venkateshwar Rao Gannavarapu 
        <venkateshwar.rao.gannavarapu@...inx.com>
To:     hyun.kwon@...inx.com, laurent.pinchart@...asonboard.com,
        dri-devel@...ts.freedesktop.org
Cc:     airlied@...ux.ie, daniel@...ll.ch, linux-kernel@...r.kernel.org,
        sandipk@...inx.com, vgannava@...inx.com,
        Venkateshwar Rao Gannavarapu 
        <venkateshwar.rao.gannavarapu@...inx.com>
Subject: [RFC PATCH 1/2] dt-bindings: display: xlnx: Add Xilinx DSI TX subsystem bindings

This add a dt binding for Xilinx DSI TX subsystem.

The Xilinx MIPI DSI (Display serial interface) Transmitter Subsystem
implements the Mobile Industry Processor Interface (MIPI) based display
interface. It supports the interface with the programmable logic (FPGA).

Signed-off-by: Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@...inx.com>
---
 .../devicetree/bindings/display/xlnx/xlnx,dsi.txt  | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/xlnx/xlnx,dsi.txt

diff --git a/Documentation/devicetree/bindings/display/xlnx/xlnx,dsi.txt b/Documentation/devicetree/bindings/display/xlnx/xlnx,dsi.txt
new file mode 100644
index 0000000..ef69729
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/xlnx/xlnx,dsi.txt
@@ -0,0 +1,68 @@
+Device-Tree bindings for Xilinx MIPI DSI Tx IP core
+
+The IP core supports transmission of video data in MIPI DSI protocol.
+
+Required properties:
+ - compatible: Should be "xlnx-dsi".
+ - reg: physical base address and length of the registers set for the device.
+ - xlnx,dsi-num-lanes: Possible number of DSI lanes for the Tx controller.
+   The values should be 1, 2, 3 or 4. Based on xlnx,dsi-num-lanes and
+   line rate for the MIPI D-PHY core in Mbps, the AXI4-stream received by
+   Xilinx MIPI DSI Tx IP core adds markers as per DSI protocol and the packet
+   thus framed is convered to serial data by MIPI D-PHY core. Please refer
+   Xilinx pg238 for more details. This value should be equal to the number
+   of lanes supported by the connected DSI panel. Panel has to support this
+   value or has to be programmed to the same value that DSI Tx controller is
+   configured to.
+ - xlnx,dsi-datatype: Color format. The value should be one of "MIPI_DSI_FMT_RGB888",
+  "MIPI_DSI_FMT_RGB666", "MIPI_DSI_FMT_RGB666_PACKED" or "MIPI_DSI_FMT_RGB565".
+ - #address-cells, #size-cells: should be set respectively to <1> and <0>
+   according to DSI host bindings (see MIPI DSI bindings [1])
+ - clock-names: Must contain "s_axis_aclk" and "dphy_clk_200M" in same order as
+   clocks listed in clocks property.
+ - clocks: List of phandles to Video and 200Mhz DPHY clocks.
+ - port: Logical block can be used / connected independently with
+   external device. In the display controller port nodes, topology
+   for entire pipeline should be described using the DT bindings defined in
+   Documentation/devicetree/bindings/graph.txt.
+ - simple_panel: The subnode for connected panel. This represents the
+   DSI peripheral connected to the DSI host node. Please refer to
+   Documentation/devicetree/bindings/display/mipi-dsi-bus.txt. The
+   simple-panel driver has auo,b101uan01 panel timing parameters added along
+   with other existing panels. DSI driver derive the required Tx IP controller
+   timing values from the panel timing parameters.
+
+Required simple_panel properties:
+ - compatible: Value should be one of the panel names in
+   Documentation/devicetree/bindings/display/panel/. e.g. "auo,b101uan01".
+   For available panel compatible strings, please refer to bindings in
+   Documentation/devicetree/bindings/display/panel/
+
+Optional properties:
+ - xlnx,dsi-cmd-mode: denotes command mode enable.
+
+[1]: Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
+[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+       mipi_dsi_tx_subsystem@...00000 {
+               compatible = "xlnx,dsi";
+               reg = <0x0 0x80000000 0x0 0x10000>;
+               xlnx,dsi-num-lanes = <4>;
+               xlnx,dsi-data-type = <MIPI_DSI_FMT_RGB888>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+               clock-names = "dphy_clk_200M", "s_axis_aclk";
+               clocks = <&misc_clk_0>, <&misc_clk_1>;
+               encoder_dsi_port: port@0 {
+                       reg = <0>;
+                       dsi_encoder: endpoint {
+                               remote-endpoint = <&xdsi_ep>;
+                       };
+               };
+               simple_panel: simple-panel@0 {
+                       compatible = "auo,b101uan01";
+                       reg = <0>;
+                       };
+               };
--
2.7.4

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