git.openwrt.org Git - openwrt/staging/blogic.git/blob

   1 From 67cd4f249333f3de9b449b9e6ebadd08facc6957 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 4 Oct 2021 14:15:38 +0100
   4 Subject: [PATCH] dtoverlays: Add overlay for ST7735R (160x128) TinyDRM
   5  driver
   6
   7 Adds an overlay to configure the TinyDRM driver for ST7735R
   8 based 160x128 and 128x128 (untested) displays such as the
   9 Adafruit 1.8" display.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 ---
  13  arch/arm/boot/dts/overlays/Makefile           |  1 +
  14  arch/arm/boot/dts/overlays/README             | 14 ++++
  15  .../dts/overlays/adafruit-st7735r-overlay.dts | 83 +++++++++++++++++++
  16  3 files changed, 98 insertions(+)
  17  create mode 100644 arch/arm/boot/dts/overlays/adafruit-st7735r-overlay.dts
  18
  19 --- a/arch/arm/boot/dts/overlays/Makefile
  20 +++ b/arch/arm/boot/dts/overlays/Makefile
  21 @@ -4,6 +4,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += overlay_ma
  22
  23  dtbo-$(CONFIG_ARCH_BCM2835) += \
  24         act-led.dtbo \
  25 +       adafruit-st7735r.dtbo \
  26         adafruit18.dtbo \
  27         adau1977-adc.dtbo \
  28         adau7002-simple.dtbo \
  29 --- a/arch/arm/boot/dts/overlays/README
  30 +++ b/arch/arm/boot/dts/overlays/README
  31 @@ -299,9 +299,23 @@ Params: activelow               Set to "
  32                                  REQUIRED
  33
  34
  35 +Name:   adafruit-st7735r
  36 +Info:   Overlay for the SPI-connected Adafruit 1.8" 160x128 or 128x128 displays,
  37 +        based on the ST7735R chip.
  38 +        This overlay uses the newer DRM/KMS "Tiny" driver.
  39 +Load:   dtoverlay=adafruit-st7735r,<param>=<val>
  40 +Params: 128x128                 Select the 128x128 driver (default 160x128)
  41 +        rotate                  Display rotation {0,90,180,270} (default 90)
  42 +        speed                   SPI bus speed in Hz (default 4000000)
  43 +        dc_pin                  GPIO pin for D/C (default 24)
  44 +        reset_pin               GPIO pin for RESET (default 25)
  45 +        led_pin                 GPIO used to control backlight (default 18)
  46 +
  47 +
  48  Name:   adafruit18
  49  Info:   Overlay for the SPI-connected Adafruit 1.8" display (based on the
  50          ST7735R chip). It includes support for the "green tab" version.
  51 +        This overlay uses the older fbtft driver.
  52  Load:   dtoverlay=adafruit18,<param>=<val>
  53  Params: green                   Use the adafruit18_green variant.
  54          rotate                  Display rotation {0,90,180,270}
  55 --- /dev/null
  56 +++ b/arch/arm/boot/dts/overlays/adafruit-st7735r-overlay.dts
  57 @@ -0,0 +1,83 @@
  58 +/*
  59 + * adafruit-st7735r-overlay.dts
  60 + *
  61 + * ST7735R based SPI LCD displays. Either
  62 + * Adafruit 1.8" 160x128
  63 + *   or
  64 + * Okaya 1.44" 128x128
  65 + */
  66 +
  67 +/dts-v1/;
  68 +/plugin/;
  69 +
  70 +#include <dt-bindings/gpio/gpio.h>
  71 +
  72 +/ {
  73 +       compatible = "brcm,bcm2835";
  74 +
  75 +       fragment@0 {
  76 +               target = <&spidev0>;
  77 +               __overlay__ {
  78 +                       status = "disabled";
  79 +               };
  80 +       };
  81 +
  82 +       fragment@1 {
  83 +               target = <&gpio>;
  84 +               __overlay__ {
  85 +                       adafruit_pins: adafruit_pins {
  86 +                               brcm,pins = <25 24>;
  87 +                               brcm,function = <1>; /* out */
  88 +                       };
  89 +                       backlight_pins: backlight_pins {
  90 +                               brcm,pins = <18>;
  91 +                               brcm,function = <1>; /* out */
  92 +                       };
  93 +               };
  94 +       };
  95 +
  96 +       fragment@2 {
  97 +               target-path = "/";
  98 +               __overlay__ {
  99 +                       af18_backlight: backlight {
 100 +                               compatible = "gpio-backlight";
 101 +                               gpios = <&gpio 18 GPIO_ACTIVE_HIGH>;
 102 +                               pinctrl-names = "default";
 103 +                               pinctrl-0 = <&backlight_pins>;
 104 +                       };
 105 +               };
 106 +       };
 107 +
 108 +       fragment@3 {
 109 +               target = <&spi0>;
 110 +               __overlay__ {
 111 +                       /* needed to avoid dtc warning */
 112 +                       #address-cells = <1>;
 113 +                       #size-cells = <0>;
 114 +                       status = "okay";
 115 +
 116 +                       af18: adafruit18@0 {
 117 +                               compatible = "jianda,jd-t18003-t01";
 118 +                               reg = <0>;
 119 +                               spi-max-frequency = <32000000>;
 120 +                               dc-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
 121 +                               reset-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
 122 +                               rotate = <90>;
 123 +                               pinctrl-names = "default";
 124 +                               pinctrl-0 = <&adafruit_pins>;
 125 +                               backlight = <&af18_backlight>;
 126 +                       };
 127 +               };
 128 +       };
 129 +
 130 +       __overrides__ {
 131 +               128x128 = <&af18>, "compatible=okaya,rh128128t";
 132 +               speed = <&af18>,"spi-max-frequency:0";
 133 +               rotate = <&af18>,"rotate:0";
 134 +               dc_pin = <&af18>,"dc-gpios:4", <&adafruit_pins>,"brcm,pins:4";
 135 +               reset_pin = <&af18>,"reset-gpios:4",
 136 +                           <&adafruit_pins>,"brcm,pins:0";
 137 +               led_pin = <&af18_backlight>,"gpios:4",
 138 +                         <&backlight_pins>,"brcm,pins:0";
 139 +       };
 140 +};