[PATCH v8 10/14] dt-bindings: display: bridge: Add i.MX8qm/qxp LVDS display bridge binding

Liu Ying
2022-06-09T06:49:49Z

This patch adds bindings for i.MX8qm/qxp LVDS display bridge(LDB).

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v7->v8:
* No change.

v6->v7:
* No change.

v5->v6:
* No change.

v4->v5:
* No change.

v3->v4:
* Add Rob's R-b tag.

v2->v3:
* Drop 'fsl,syscon' property. (Rob)
* Mention the CSR module controls LDB.

v1->v2:
* Use graph schema. (Laurent)
* Side note i.MX8qxp LDB official name 'pixel mapper'. (Laurent)

.../display/bridge/fsl,imx8qxp-ldb.yaml | 173 ++++++++++++++++++
1 file changed, 173 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
new file mode 100644
index 000000000000..94543006f5de
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-ldb.yaml
@@ -0,0 +1,173 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-ldb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qm/qxp LVDS Display Bridge
+
+maintainers:
+ - Liu Ying <victor.liu@nxp.com>
+
+description: |
+ The Freescale i.MX8qm/qxp LVDS Display Bridge(LDB) has two channels.
+
+ The i.MX8qm/qxp LDB is controlled by Control and Status Registers(CSR) module.
+ The CSR module, as a system controller, contains the LDB's configuration
+ registers.
+
+ For i.MX8qxp LDB, each channel supports up to 24bpp parallel input color
+ format and can map the input to VESA or JEIDA standards. The two channels
+ cannot be used simultaneously, that is to say, the user should pick one of
+ them to use. Two LDB channels from two LDB instances can work together in
+ LDB split mode to support a dual link LVDS display. The channel indexes
+ have to be different. Channel0 outputs odd pixels and channel1 outputs
+ even pixels.
+
+ For i.MX8qm LDB, each channel additionally supports up to 30bpp parallel
+ input color format. The two channels can be used simultaneously, either
+ in dual mode or split mode. In dual mode, the two channels output identical
+ data. In split mode, channel0 outputs odd pixels and channel1 outputs even
+ pixels.
+
+ A side note is that i.MX8qm/qxp LDB is officially called pixel mapper in
+ the SoC reference manuals. The pixel mapper uses logic of LDBs embedded in
+ i.MX6qdl/sx SoCs, i.e., it is essentially based on them. To keep the naming
+ consistency, this binding calls it LDB.
+
+properties:
+ compatible:
+ enum:
+ - fsl,imx8qm-ldb
+ - fsl,imx8qxp-ldb
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ clocks:
+ items:
+ - description: pixel clock
+ - description: bypass clock
+
+ clock-names:
+ items:
+ - const: pixel
+ - const: bypass
+
+ power-domains:
+ maxItems: 1
+
+ fsl,companion-ldb:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: |
+ A phandle which points to companion LDB which is used in LDB split mode.
+
+patternProperties:
+ "^channel@[0-1]$":
+ type: object
+ description: Represents a channel of LDB.
+
+ properties:
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ reg:
+ description: The channel index.
+ enum: [ 0, 1 ]
+
+ phys:
+ description: A phandle to the phy module representing the LVDS PHY.
+ maxItems: 1
+
+ phy-names:
+ const: lvds_phy
+
+ port@0:
+ $ref: /schemas/graph.yaml#/properties/port
+ description: Input port of the channel.
+
+ port@1:
+ $ref: /schemas/graph.yaml#/properties/port
+ description: Output port of the channel.
+
+ required:
+ - "#address-cells"
+ - "#size-cells"
+ - reg
+ - phys
+ - phy-names
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - "#address-cells"
+ - "#size-cells"
+ - clocks
+ - clock-names
+ - power-domains
+ - channel@0
+ - channel@1
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: fsl,imx8qm-ldb
+ then:
+ properties:
+ fsl,companion-ldb: false
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/firmware/imx/rsrc.h>
+ ldb {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "fsl,imx8qxp-ldb";
+ clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_MISC2>,
+ <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_BYPASS>;
+ clock-names = "pixel", "bypass";
+ power-domains = <&pd IMX_SC_R_LVDS_0>;
+
+ channel@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+ phys = <&mipi_lvds_0_phy>;
+ phy-names = "lvds_phy";
+
+ port@0 {
+ reg = <0>;
+
+ mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi: endpoint {
+ remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0>;
+ };
+ };
+ };
+
+ channel@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <1>;
+ phys = <&mipi_lvds_0_phy>;
+ phy-names = "lvds_phy";
+
+ port@0 {
+ reg = <0>;
+
+ mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi: endpoint {
+ remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1>;
+ };
+ };
+ };
+ };
--
2.25.1