ARM: bcm2835: Add names for the RPi Zero GPIO lines

This adds the GPIO names for the Raspberry Pi Zero. The GPIO lines
of the RPi Zero are almost identical to the Model A+ except:

* GPIO 35, 38, 40 and 45 are not connected
* Status LED is active low

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/arch/arm/boot/dts/bcm2835-rpi-zero.dts b/arch/arm/boot/dts/bcm2835-rpi-zero.dts
index 7c1c18048948bf1e7de448e7ce89495cd6c4ecdd..cc8b832c4c781446d685ecccf37839ad11d61247 100644 (file)
--- a/arch/arm/boot/dts/bcm2835-rpi-zero.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-zero.dts
@@ -26,6 +26,71 @@ act {
 };
 
 &gpio {
+       /*
+        * This is based on the official GPU firmware DT blob.
+        *
+        * Legend:
+        * "NC" = not connected (no rail from the SoC)
+        * "FOO" = GPIO line named "FOO" on the schematic
+        * "FOO_N" = GPIO line named "FOO" on schematic, active low
+        */
+       gpio-line-names = "SDA0",
+                         "SCL0",
+                         "SDA1",
+                         "SCL1",
+                         "GPIO_GCLK",
+                         "GPIO5",
+                         "GPIO6",
+                         "SPI_CE1_N",
+                         "SPI_CE0_N",
+                         "SPI_MISO",
+                         "SPI_MOSI",
+                         "SPI_SCLK",
+                         "GPIO12",
+                         "GPIO13",
+                         /* Serial port */
+                         "TXD0",
+                         "RXD0",
+                         "GPIO16",
+                         "GPIO17",
+                         "GPIO18",
+                         "GPIO19",
+                         "GPIO20",
+                         "GPIO21",
+                         "GPIO22",
+                         "GPIO23",
+                         "GPIO24",
+                         "GPIO25",
+                         "GPIO26",
+                         "GPIO27",
+                         "SDA0",
+                         "SCL0",
+                         "NC", /* GPIO30 */
+                         "NC", /* GPIO31 */
+                         "CAM_GPIO1", /* GPIO32 */
+                         "NC", /* GPIO33 */
+                         "NC", /* GPIO34 */
+                         "NC", /* GPIO35 */
+                         "NC", /* GPIO36 */
+                         "NC", /* GPIO37 */
+                         "NC", /* GPIO38 */
+                         "NC", /* GPIO39 */
+                         "NC", /* GPIO40 */
+                         "CAM_GPIO0", /* GPIO41 */
+                         "NC", /* GPIO42 */
+                         "NC", /* GPIO43 */
+                         "NC", /* GPIO44 */
+                         "NC", /* GPIO45 */
+                         "HDMI_HPD_N",
+                         "STATUS_LED_N",
+                         /* Used by SD Card */
+                         "SD_CLK_R",
+                         "SD_CMD_R",
+                         "SD_DATA0_R",
+                         "SD_DATA1_R",
+                         "SD_DATA2_R",
+                         "SD_DATA3_R";
+
        pinctrl-0 = <&gpioout &alt0 &i2s_alt0>;
 
        /* I2S interface */