target/linux/bcm27xx/patches-5.15/950-0649-dtoverlays-Add-backlight-gpio-parameter-to-vc4-kms-d.patch

   1 From 97a59d460244efdb87b464b9f07c1e90e7e7129a Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Fri, 7 Jan 2022 11:12:08 +0000
   4 Subject: [PATCH] dtoverlays: Add backlight-gpio parameter to
   5  vc4-kms-dpi-generic
   6
   7 To allow for the cases where a simple panel does have a GPIO
   8 controlled backlight. Defaults to having no backlight defined.
   9
  10 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  11 ---
  12  arch/arm/boot/dts/overlays/README             |  2 ++
  13  .../overlays/vc4-kms-dpi-generic-overlay.dts  | 19 +++++++++++++++++++
  14  2 files changed, 21 insertions(+)
  15
  16 --- a/arch/arm/boot/dts/overlays/README
  17 +++ b/arch/arm/boot/dts/overlays/README
  18 @@ -3638,6 +3638,8 @@ Params: clock-frequency         Display
  19          rgb888                  Change to RGB888 output on GPIOs 0-27
  20          bus-format              Override the bus format for a MEDIA_BUS_FMT_*
  21                                  value. NB also overridden by rgbXXX overrides.
  22 +        backlight-gpio          Defines a GPIO to be used for backlight control
  23 +                                (default of none).
  24
  25
  26  Name:   vc4-kms-dsi-7inch
  27 --- a/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts
  28 +++ b/arch/arm/boot/dts/overlays/vc4-kms-dpi-generic-overlay.dts
  29 @@ -63,6 +63,23 @@
  30                 };
  31         };
  32
  33 +       fragment@2 {
  34 +               target = <&panel>;
  35 +               __dormant__  {
  36 +                       backlight = <&backlight>;
  37 +               };
  38 +       };
  39 +
  40 +       fragment@3 {
  41 +               target-path = "/";
  42 +               __dormant__  {
  43 +                       backlight: backlight {
  44 +                               compatible = "gpio-backlight";
  45 +                               gpios = <&gpio 255 GPIO_ACTIVE_HIGH>;
  46 +                       };
  47 +               };
  48 +       };
  49 +
  50         __overrides__ {
  51                 clock-frequency = <&timing>, "clock-frequency:0";
  52                 hactive = <&timing>, "hactive:0";
  53 @@ -88,5 +105,7 @@
  54                 rgb888 = <&panel>, "bus-format:0=0x100a",
  55                         <&dpi_node>, "pinctrl-0:0=",<&dpi_gpio0>;
  56                 bus-format = <&panel>, "bus-format:0";
  57 +               backlight-gpio = <0>, "+2+3",
  58 +                       <&backlight>, "gpios:4";
  59         };
  60  };