arm64: dts: bitmain: Add GPIO Line names for Sophon Edge board

Add GPIO line names for Sophon Edge board based on BM1880 SoC from
Bitmain. Line names are based on the board schematics as well as the
96Boards Consumer Edition specification v1.0.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm64/boot/dts/bitmain/bm1880-sophon-edge.dts

@@ -8,6 +8,28 @@
 
 #include "bm1880.dtsi"
 
+/*
+ * GPIO name legend: proper name = the GPIO line is used as GPIO
+ *         NC = not connected (pin out but not routed from the chip to
+ *              anything the board)
+ *         "[PER]" = pin is muxed for [peripheral] (not GPIO)
+ *         LSEC = Low Speed External Connector
+ *         HSEC = High Speed External Connector
+ *
+ * Line names are taken from the schematic "sophon-edge-schematics"
+ * version, 1.0210.
+ *
+ * For the lines routed to the external connectors the
+ * lines are named after the 96Boards CE Specification 1.0,
+ * Appendix "Expansion Connector Signal Description".
+ *
+ * When the 96Board naming of a line and the schematic name of
+ * the same line are in conflict, the 96Board specification
+ * takes precedence. This is only for the informational
+ * lines i.e. "[FOO]", the GPIO named lines "GPIO-A" thru "GPIO-L"
+ * are the only ones actually used for GPIO.
+ */
+
 / {
 	compatible = "bitmain,sophon-edge", "bitmain,bm1880";
 	model = "Sophon Edge";
@@ -32,6 +54,98 @@
 		clock-frequency = <500000000>;
 		#clock-cells = <0>;
 	};
+
+	soc {
+		gpio0: gpio@50027000 {
+			porta: gpio-controller@0 {
+				gpio-line-names =
+					"GPIO-A", /* GPIO0, LSEC pin 23 */
+					"GPIO-C", /* GPIO1, LSEC pin 25 */
+					"[GPIO2_PHY0_RST]", /* GPIO2 */
+					"GPIO-E", /* GPIO3, LSEC pin 27 */
+					"[USB_DET]", /* GPIO4 */
+					"[EN_P5V]", /* GPIO5 */
+					"[VDDIO_MS1_SEL]", /* GPIO6 */
+					"GPIO-G", /* GPIO7, LSEC pin 29 */
+					"[BM_TUSB_RST_L]", /* GPIO8 */
+					"[EN_P5V_USBHUB]", /* GPIO9 */
+					"NC",
+					"LED_WIFI", /* GPIO11 */
+					"LED_BT", /* GPIO12 */
+					"[BM_BLM8221_EN_L]", /* GPIO13 */
+					"NC", /* GPIO14 */
+					"NC", /* GPIO15 */
+					"NC", /* GPIO16 */
+					"NC", /* GPIO17 */
+					"NC", /* GPIO18 */
+					"NC", /* GPIO19 */
+					"NC", /* GPIO20 */
+					"NC", /* GPIO21 */
+					"NC", /* GPIO22 */
+					"NC", /* GPIO23 */
+					"NC", /* GPIO24 */
+					"NC", /* GPIO25 */
+					"NC", /* GPIO26 */
+					"NC", /* GPIO27 */
+					"NC", /* GPIO28 */
+					"NC", /* GPIO29 */
+					"NC", /* GPIO30 */
+					"NC"; /* GPIO31 */
+			};
+		};
+
+		gpio1: gpio@50027400 {
+			portb: gpio-controller@0 {
+				gpio-line-names =
+					"NC", /* GPIO32 */
+					"NC", /* GPIO33 */
+					"[I2C0_SDA]", /* GPIO34, LSEC pin 17 */
+					"[I2C0_SCL]", /* GPIO35, LSEC pin 15 */
+					"[JTAG0_TDO]", /* GPIO36 */
+					"[JTAG0_TCK]", /* GPIO37 */
+					"[JTAG0_TDI]", /* GPIO38 */
+					"[JTAG0_TMS]", /* GPIO39 */
+					"[JTAG0_TRST_X]", /* GPIO40 */
+					"[JTAG1_TDO]", /* GPIO41 */
+					"[JTAG1_TCK]", /* GPIO42 */
+					"[JTAG1_TDI]", /* GPIO43 */
+					"[CPU_TX]", /* GPIO44 */
+					"[CPU_RX]", /* GPIO45 */
+					"[UART1_TXD]", /* GPIO46 */
+					"[UART1_RXD]", /* GPIO47 */
+					"[UART0_TXD]", /* GPIO48 */
+					"[UART0_RXD]", /* GPIO49 */
+					"GPIO-I", /* GPIO50, LSEC pin 31 */
+					"GPIO-K", /* GPIO51, LSEC pin 33 */
+					"USER_LED2", /* GPIO52 */
+					"USER_LED1", /* GPIO53 */
+					"[UART0_RTS]", /* GPIO54 */
+					"[UART0_CTS]", /* GPIO55 */
+					"USER_LED4", /* GPIO56, JTAG1_TRST_X */
+					"USER_LED3", /* GPIO57, JTAG1_TMS */
+					"[I2S0_SCLK]", /* GPIO58 */
+					"[I2S0_FS]", /* GPIO59 */
+					"[I2S0_SDI]", /* GPIO60 */
+					"[I2S0_SDO]", /* GPIO61 */
+					"GPIO-B", /* GPIO62, LSEC pin 24 */
+					"GPIO-F"; /* GPIO63, I2S1_SCLK, LSEC pin 28 */
+			};
+		};
+
+		gpio2: gpio@50027800 {
+			portc: gpio-controller@0 {
+				gpio-line-names =
+					"GPIO-D", /* GPIO64, I2S1_FS, LSEC pin 26 */
+					"GPIO-J", /* GPIO65, I2S1_SDI, LSEC pin 32 */
+					"GPIO-H", /* GPIO66, I2S1_SDO, LSEC pin 30 */
+					"GPIO-L", /* GPIO67, LSEC pin 34 */
+					"[SPI0_CS]", /* GPIO68, SPI1_CS, LSEC pin 12 */
+					"[SPI0_DIN]", /* GPIO69, SPI1_SDI, LSEC pin 10 */
+					"[SPI0_DOUT]", /* GPIO70, SPI1_SDO, LSEC pin 14 */
+					"[SPI0_SCLK]"; /* GPIO71, SPI1_SCK, LSEC pin 8 */
+			};
+		};
+	};
 };
 
 &uart0 {