[PATCH] dt-bindings: lcdif: Add support for specifying display with timings

Lukasz Majewski
2024-09-23T13:58:00Z

Up till now the fsl,lcdif.yaml was requiring the "port" property as a
must have to specify the display interface on iMX devices.

However, it shall also be possible to specify the display only with
passing its timing parameters (h* and v* ones) via "display" property:
(as in
Documentation/devicetree/bindings/display/panel/display-timings.yaml).

Such approach has already been used (also in the mainline) with several
imx28, imx5x and imx6q devices.

This change allows them to pass the DT_SCHEMA check without issues.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
.../bindings/display/fsl,lcdif.yaml | 51 ++++++++++++++++++-
1 file changed, 49 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
index 8e3a98aeec32..14bb64b5b72d 100644
--- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
+++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
@@ -50,6 +50,10 @@ properties:
- const: disp_axi
minItems: 1

+ display:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: The phandle for display timing information
+
dmas:
items:
- description: DMA specifier for the RX DMA channel.
@@ -64,6 +68,9 @@ properties:
- description: LCDIF Error interrupt
minItems: 1

+ lcd-supply:
+ description: Regulator for LCD supply voltage.
+
power-domains:
maxItems: 1

@@ -76,7 +83,10 @@ required:
- reg
- clocks
- interrupts
- - port
+
+patternProperties:
+ 'display([0-9])':
+ description: Node with display timing parameters

additionalProperties: false

@@ -197,5 +207,42 @@ examples:
};
};
};
-
+ - |
+ lcdif: lcdif@80030000 {
+ compatible = "fsl,imx28-lcdif";
+ reg = <0x80030000 0x2000>;
+ interrupts = <38>;
+ clocks = <&clks 55>;
+ dmas = <&dma_apbh 13>;
+ dma-names = "rx";
+ pinctrl-names = "default";
+ pinctrl-0 = <&lcdif_24bit_pins_a>, <&lcdif_sync_pins_bttc>,
+ <&lcdif_reset_pins_bttc>;
+ lcd-supply = <&reg_3v3>;
+ display = <&display0>;
+ status = "okay";
+
+ display0: display0 {
+ bits-per-pixel = <32>;
+ bus-width = <24>;
+ display-timings {
+ native-mode = <&timing0>;
+ timing0: timing0 {
+ clock-frequency = <6500000>;
+ hactive = <320>;
+ vactive = <240>;
+ hfront-porch = <20>;
+ hback-porch = <38>;
+ hsync-len = <30>;
+ vfront-porch = <4>;
+ vback-porch = <14>;
+ vsync-len = <4>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ de-active = <0>;
+ pixelclk-active = <1>;
+ };
+ };
+ };
+ };
...
--
2.39.2