arm: v2m_musca: Enable GPIO support

Enable CMSDK GPIO driver on v2m_musca SoC/Board.  Add LEDs that are on
the board and init the pinmux for those LEDs to work.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

boards/arm/v2m_musca/Kconfig.defconfig

@@ -21,6 +21,15 @@ config BOARD
 endif
 
 
+if GPIO
+
+config GPIO_CMSDK_AHB
+	default y
+
+config GPIO_CMSDK_AHB_PORT0
+	default y
+
+endif
 
 if SERIAL
 

boards/arm/v2m_musca/pinmux.c

@@ -22,6 +22,10 @@
 #define IOMUX_ALTF1_OUTSEL	(0x44 >> 2)
 #define IOMUX_ALTF1_OENSEL	(0x48 >> 2)
 #define IOMUX_ALTF1_DEFAULT_IN	(0x4c >> 2)
+#define IOMUX_ALTF2_INSEL	(0x50 >> 2)
+#define IOMUX_ALTF2_OUTSEL	(0x54 >> 2)
+#define IOMUX_ALTF2_OENSEL	(0x58 >> 2)
+#define IOMUX_ALTF2_DEFAULT_IN	(0x5c >> 2)
 
 #ifdef CONFIG_TRUSTED_EXECUTION_SECURE
 /*
@@ -47,6 +51,13 @@ static void arm_musca_pinmux_defaults(void)
 #else
 static void arm_musca_pinmux_defaults(void)
 {
+	volatile u32_t *scc = (u32_t *)DT_ARM_SCC_BASE_ADDRESS;
+
+	/* Enable PINs for LEDS */
+	scc[IOMUX_ALTF1_OUTSEL] &= ~(BIT(2) | BIT(3) | BIT(4));
+	scc[IOMUX_ALTF1_OENSEL] &= ~(BIT(2) | BIT(3) | BIT(4));
+	scc[IOMUX_ALTF2_OUTSEL] &= ~(BIT(2) | BIT(3) | BIT(4));
+	scc[IOMUX_ALTF2_OENSEL] &= ~(BIT(2) | BIT(3) | BIT(4));
 }
 #endif
 

boards/arm/v2m_musca/v2m_musca-common.dtsi

@@ -69,3 +69,15 @@ scc@10c000 {
 	compatible = "arm,scc";
 	reg = <0x10c000 0x1000>;
 };
+
+gpio: gpio@110000 {
+	compatible = "arm,cmsdk-gpio";
+	reg = <0x110000 0x1000>;
+	interrupts = <51 3 52 3 53 3 54 3
+		      55 3 56 3 57 3 58 3
+		      59 3 60 3 61 3 62 3
+		      63 3 64 3 65 3 66 3>;
+	gpio-controller;
+	#gpio-cells = <2>;
+	label = "GPIO_0";
+};

boards/arm/v2m_musca/v2m_musca.dts

@@ -13,6 +13,12 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	aliases {
+		led0 = &green_led;
+		led1 = &blue_led;
+		led2 = &red_led;
+	};
+
 	chosen {
 		zephyr,console = &uart1;
 		zephyr,sram = &sram0;
@@ -20,6 +26,21 @@
 		zephyr,shell-uart = &uart1;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		red_led: led_0 {
+			gpios = <&gpio 2 0>;
+			label = "User LD1";
+		};
+		green_led: led_1 {
+			gpios = <&gpio 3 0>;
+			label = "User LD2";
+		};
+		blue_led: led_2 {
+			gpios = <&gpio 4 0>;
+			label = "User LD3";
+		};
+	};
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

boards/arm/v2m_musca/v2m_musca.yaml

@@ -8,3 +8,4 @@ toolchain:
   - zephyr
 supported:
   - counter
+  - gpio

soc/arm/arm/musca_a/dts_fixup.h

@@ -36,6 +36,10 @@
 /* SCC */
 #define DT_ARM_SCC_BASE_ADDRESS			DT_ARM_SCC_4010C000_BASE_ADDRESS
 
+/* CMSDK AHB General Purpose Input/Output (GPIO) */
+#define DT_CMSDK_AHB_GPIO0			DT_ARM_CMSDK_GPIO_40110000_BASE_ADDRESS
+#define DT_IRQ_PORT0_ALL			DT_ARM_CMSDK_GPIO_40110000_IRQ_0
+
 #else
 
 /* CMSDK APB Universal Asynchronous Receiver-Transmitter (UART) */
@@ -62,6 +66,10 @@
 /* SCC */
 #define DT_ARM_SCC_BASE_ADDRESS			DT_ARM_SCC_5010C000_BASE_ADDRESS
 
+/* CMSDK AHB General Purpose Input/Output (GPIO) */
+#define DT_CMSDK_AHB_GPIO0			DT_ARM_CMSDK_GPIO_50110000_BASE_ADDRESS
+#define DT_IRQ_PORT0_ALL			DT_ARM_CMSDK_GPIO_50110000_IRQ_0
+
 #endif
 
 /* End of SoC Level DTS fixup file */