[PATCH 5.14 166/432] drm/panel: Fix up DT bindings for Samsung lms397kf04

Greg Kroah-Hartman
2021-09-16T17:30:48Z

From: Linus Walleij <linus.walleij@linaro.org>

[ Upstream commit 710fa9aa16321f2ffdd8383f6f780c9cc1e5a197 ]

Improve the bindings and make them more usable:

- Pick in spi-cpha and spi-cpol from the SPI node parent,
this will specify that we are "type 3" in the device tree
rather than hardcoding it in the operating system.
- Drop the u32 ref from the SPI frequency: comes in from
the SPI host bindings.
- Make spi-cpha, spi-cpol and port compulsory.
- Update the example with a real-world SPI controller,
spi-gpio.

Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210701213618.3818821-1-linus.walleij@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../display/panel/samsung,lms397kf04.yaml | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml b/Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
index 4cb75a5f2e3a..cd62968426fb 100644
--- a/Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
+++ b/Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
@@ -33,8 +33,11 @@ properties:

backlight: true

+ spi-cpha: true
+
+ spi-cpol: true
+
spi-max-frequency:
- $ref: /schemas/types.yaml#/definitions/uint32
description: inherited as a SPI client node, the datasheet specifies
maximum 300 ns minimum cycle which gives around 3 MHz max frequency
maximum: 3000000
@@ -44,6 +47,9 @@ properties:
required:
- compatible
- reg
+ - spi-cpha
+ - spi-cpol
+ - port

additionalProperties: false

@@ -52,15 +58,23 @@ examples:
#include <dt-bindings/gpio/gpio.h>

spi {
+ compatible = "spi-gpio";
+ sck-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+ miso-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+ mosi-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+ cs-gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
+ num-chipselects = <1>;
#address-cells = <1>;
#size-cells = <0>;
panel@0 {
compatible = "samsung,lms397kf04";
spi-max-frequency = <3000000>;
+ spi-cpha;
+ spi-cpol;
reg = <0>;
vci-supply = <&lcd_3v0_reg>;
vccio-supply = <&lcd_1v8_reg>;
- reset-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+ reset-gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
backlight = <&ktd259>;

port {
--
2.30.2