target/linux/bcm27xx/patches-4.19/950-0790-Add-universal-device-tree-overlay-for-SPI-devices.patch

   1 From 4d19be9132ca10cf582450a86dcb2c41f227f589 Mon Sep 17 00:00:00 2001
   2 From: Ed Spiridonov <edo.rus@gmail.com>
   3 Date: Tue, 10 Dec 2019 22:45:04 +0300
   4 Subject: [PATCH] Add universal device tree overlay for SPI devices
   5
   6 Just specify the SPI address and device name ("compatible" property).
   7 This overlay lacks any device-specific parameter support!
   8 (some of them could be added later)
   9
  10 Examples:
  11 1. SPI NOR flash on spi0.1, maximum SPI clock frequency 45MHz:
  12     dtoverlay=anyspi:spi0-1,dev="jedec,spi-nor",speed=45000000
  13 2. MCP3204 ADC on spi1.2, maximum SPI clock frequency 500kHz:
  14     dtoverlay=anyspi:spi1-2,dev="microchip,mcp3204"
  15
  16 Signed-off-by: Ed Spiridonov <edo.rus@gmail.com>
  17 ---
  18  arch/arm/boot/dts/overlays/Makefile           |   1 +
  19  arch/arm/boot/dts/overlays/README             |  23 ++
  20  arch/arm/boot/dts/overlays/anyspi-overlay.dts | 205 ++++++++++++++++++
  21  3 files changed, 229 insertions(+)
  22  create mode 100755 arch/arm/boot/dts/overlays/anyspi-overlay.dts
  23
  24 --- a/arch/arm/boot/dts/overlays/Makefile
  25 +++ b/arch/arm/boot/dts/overlays/Makefile
  26 @@ -15,6 +15,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  27         allo-katana-dac-audio.dtbo \
  28         allo-piano-dac-pcm512x-audio.dtbo \
  29         allo-piano-dac-plus-pcm512x-audio.dtbo \
  30 +       anyspi.dtbo \
  31         apds9960.dtbo \
  32         applepi-dac.dtbo \
  33         at86rf233.dtbo \
  34 --- a/arch/arm/boot/dts/overlays/README
  35 +++ b/arch/arm/boot/dts/overlays/README
  36 @@ -441,6 +441,29 @@ Params: 24db_digital_gain       Allow ga
  37                                  better voice quality. (default Off)
  38
  39
  40 +Name:   anyspi
  41 +Info:   Universal device tree overlay for SPI devices
  42 +
  43 +        Just specify the SPI address and device name ("compatible" property).
  44 +        This overlay lacks any device-specific parameter support!
  45 +
  46 +        For devices on spi1 or spi2, the interfaces should be enabled
  47 +        with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
  48 +
  49 +        Examples:
  50 +        1. SPI NOR flash on spi0.1, maximum SPI clock frequency 45MHz:
  51 +            dtoverlay=anyspi:spi0-1,dev="jedec,spi-nor",speed=45000000
  52 +        2. MCP3204 ADC on spi1.2, maximum SPI clock frequency 500kHz:
  53 +            dtoverlay=anyspi:spi1-2,dev="microchip,mcp3204"
  54 +Load:   dtoverlay=anyspi,<param>=<val>
  55 +Params: spi<n>-<m>              Configure device at spi<n>, cs<m>
  56 +                                (boolean, required)
  57 +        dev                     Set device name to search compatible module
  58 +                                (string, required)
  59 +        speed                   Set SPI clock frequency in Hz
  60 +                                (integer, optional, default 500000)
  61 +
  62 +
  63  Name:   apds9960
  64  Info:   Configures the AVAGO APDS9960 digital proximity, ambient light, RGB and
  65          gesture sensor
  66 --- /dev/null
  67 +++ b/arch/arm/boot/dts/overlays/anyspi-overlay.dts
  68 @@ -0,0 +1,205 @@
  69 +/*
  70 + * Universal device tree overlay for SPI devices
  71 + */
  72 +
  73 +/dts-v1/;
  74 +/plugin/;
  75 +
  76 +/ {
  77 +       compatible = "brcm,bcm2835";
  78 +
  79 +       fragment@0 {
  80 +               target = <&spidev0>;
  81 +               __dormant__ {
  82 +                       status = "disabled";
  83 +               };
  84 +       };
  85 +
  86 +       fragment@1 {
  87 +               target = <&spidev1>;
  88 +               __dormant__ {
  89 +                       status = "disabled";
  90 +               };
  91 +       };
  92 +
  93 +       fragment@2 {
  94 +               target-path = "spi1/spidev@0";
  95 +               __dormant__ {
  96 +                       status = "disabled";
  97 +               };
  98 +       };
  99 +
 100 +       fragment@3 {
 101 +               target-path = "spi1/spidev@1";
 102 +               __dormant__ {
 103 +                       status = "disabled";
 104 +               };
 105 +       };
 106 +
 107 +       fragment@4 {
 108 +               target-path = "spi1/spidev@2";
 109 +               __dormant__ {
 110 +                       status = "disabled";
 111 +               };
 112 +       };
 113 +
 114 +       fragment@5 {
 115 +               target-path = "spi2/spidev@0";
 116 +               __dormant__ {
 117 +                       status = "disabled";
 118 +               };
 119 +       };
 120 +
 121 +       fragment@6 {
 122 +               target-path = "spi2/spidev@1";
 123 +               __dormant__ {
 124 +                       status = "disabled";
 125 +               };
 126 +       };
 127 +
 128 +       fragment@7 {
 129 +               target-path = "spi2/spidev@2";
 130 +               __dormant__ {
 131 +                       status = "disabled";
 132 +               };
 133 +       };
 134 +
 135 +       fragment@8 {
 136 +               target = <&spi0>;
 137 +               __dormant__ {
 138 +                       status = "okay";
 139 +                       #address-cells = <1>;
 140 +                       #size-cells = <0>;
 141 +
 142 +                       anyspi_00: anyspi@0 {
 143 +                               reg = <0>;
 144 +                               spi-max-frequency = <500000>;
 145 +                       };
 146 +               };
 147 +       };
 148 +
 149 +       fragment@9 {
 150 +               target = <&spi0>;
 151 +               __dormant__ {
 152 +                       status = "okay";
 153 +                       #address-cells = <1>;
 154 +                       #size-cells = <0>;
 155 +
 156 +                       anyspi_01: anyspi@1 {
 157 +                               reg = <1>;
 158 +                               spi-max-frequency = <500000>;
 159 +                       };
 160 +               };
 161 +       };
 162 +
 163 +       fragment@10 {
 164 +               target = <&spi1>;
 165 +               __dormant__ {
 166 +                       status = "okay";
 167 +                       #address-cells = <1>;
 168 +                       #size-cells = <0>;
 169 +
 170 +                       anyspi_10: anyspi@0 {
 171 +                               reg = <0>;
 172 +                               spi-max-frequency = <500000>;
 173 +                       };
 174 +               };
 175 +       };
 176 +
 177 +       fragment@11 {
 178 +               target = <&spi1>;
 179 +               __dormant__ {
 180 +                       status = "okay";
 181 +                       #address-cells = <1>;
 182 +                       #size-cells = <0>;
 183 +
 184 +                       anyspi_11: anyspi@1 {
 185 +                               reg = <1>;
 186 +                               spi-max-frequency = <500000>;
 187 +                       };
 188 +               };
 189 +       };
 190 +
 191 +       fragment@12 {
 192 +               target = <&spi1>;
 193 +               __dormant__ {
 194 +                       status = "okay";
 195 +                       #address-cells = <1>;
 196 +                       #size-cells = <0>;
 197 +
 198 +                       anyspi_12: anyspi@2 {
 199 +                               reg = <2>;
 200 +                               spi-max-frequency = <500000>;
 201 +                       };
 202 +               };
 203 +       };
 204 +
 205 +       fragment@13 {
 206 +               target = <&spi2>;
 207 +               __dormant__ {
 208 +                       status = "okay";
 209 +                       #address-cells = <1>;
 210 +                       #size-cells = <0>;
 211 +
 212 +                       anyspi_20: anyspi@0 {
 213 +                               reg = <0>;
 214 +                               spi-max-frequency = <500000>;
 215 +                       };
 216 +               };
 217 +       };
 218 +
 219 +       fragment@14 {
 220 +               target = <&spi2>;
 221 +               __dormant__ {
 222 +                       status = "okay";
 223 +                       #address-cells = <1>;
 224 +                       #size-cells = <0>;
 225 +
 226 +                       anyspi_21: anyspi@1 {
 227 +                               reg = <1>;
 228 +                               spi-max-frequency = <500000>;
 229 +                       };
 230 +               };
 231 +       };
 232 +
 233 +       fragment@15 {
 234 +               target = <&spi2>;
 235 +               __dormant__ {
 236 +                       status = "okay";
 237 +                       #address-cells = <1>;
 238 +                       #size-cells = <0>;
 239 +
 240 +                       anyspi_22: anyspi@2 {
 241 +                               reg = <2>;
 242 +                               spi-max-frequency = <500000>;
 243 +                       };
 244 +               };
 245 +       };
 246 +
 247 +       __overrides__ {
 248 +               spi0-0 = <0>, "+0+8";
 249 +               spi0-1 = <0>, "+1+9";
 250 +               spi1-0 = <0>, "+2+10";
 251 +               spi1-1 = <0>, "+3+11";
 252 +               spi1-2 = <0>, "+4+12";
 253 +               spi2-0 = <0>, "+5+13";
 254 +               spi2-1 = <0>, "+6+14";
 255 +               spi2-2 = <0>, "+7+15";
 256 +               dev = <&anyspi_00>,"compatible",
 257 +                     <&anyspi_01>,"compatible",
 258 +                     <&anyspi_10>,"compatible",
 259 +                     <&anyspi_11>,"compatible",
 260 +                     <&anyspi_12>,"compatible",
 261 +                     <&anyspi_20>,"compatible",
 262 +                     <&anyspi_21>,"compatible",
 263 +                     <&anyspi_22>,"compatible";
 264 +               speed = <&anyspi_00>, "spi-max-frequency:0",
 265 +                       <&anyspi_01>, "spi-max-frequency:0",
 266 +                       <&anyspi_10>, "spi-max-frequency:0",
 267 +                       <&anyspi_11>, "spi-max-frequency:0",
 268 +                       <&anyspi_12>, "spi-max-frequency:0",
 269 +                       <&anyspi_20>, "spi-max-frequency:0",
 270 +                       <&anyspi_21>, "spi-max-frequency:0",
 271 +                       <&anyspi_22>, "spi-max-frequency:0";
 272 +       };
 273 +};