ARM: mxs: add gpio support for device tree boot

It adds gpio support for device tree boot.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/imx23.dtsi

@@ -14,6 +14,12 @@
 / {
 	interrupt-parent = <&icoll>;
 
+	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+	};
+
 	cpus {
 		cpu@0 {
 			compatible = "arm,arm926ejs";
@@ -74,9 +80,36 @@
 			pinctrl@80018000 {
 				#address-cells = <1>;
 				#size-cells = <0>;
-				compatible = "fsl,imx23-pinctrl";
+				compatible = "fsl,imx23-pinctrl", "simple-bus";
 				reg = <0x80018000 2000>;
 
+				gpio0: gpio@0 {
+					compatible = "fsl,imx23-gpio", "fsl,mxs-gpio";
+					interrupts = <16>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio1: gpio@1 {
+					compatible = "fsl,imx23-gpio", "fsl,mxs-gpio";
+					interrupts = <17>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio2: gpio@2 {
+					compatible = "fsl,imx23-gpio", "fsl,mxs-gpio";
+					interrupts = <18>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
 				duart_pins_a: duart@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <0x11a2 0x11b2>;

arch/arm/boot/dts/imx28.dtsi

@@ -14,6 +14,14 @@
 / {
 	interrupt-parent = <&icoll>;
 
+	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		gpio4 = &gpio4;
+	};
+
 	cpus {
 		cpu@0 {
 			compatible = "arm,arm926ejs";
@@ -97,9 +105,54 @@
 			pinctrl@80018000 {
 				#address-cells = <1>;
 				#size-cells = <0>;
-				compatible = "fsl,imx28-pinctrl";
+				compatible = "fsl,imx28-pinctrl", "simple-bus";
 				reg = <0x80018000 2000>;
 
+				gpio0: gpio@0 {
+					compatible = "fsl,imx28-gpio", "fsl,mxs-gpio";
+					interrupts = <127>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio1: gpio@1 {
+					compatible = "fsl,imx28-gpio", "fsl,mxs-gpio";
+					interrupts = <126>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio2: gpio@2 {
+					compatible = "fsl,imx28-gpio", "fsl,mxs-gpio";
+					interrupts = <125>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio3: gpio@3 {
+					compatible = "fsl,imx28-gpio", "fsl,mxs-gpio";
+					interrupts = <124>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
+				gpio4: gpio@4 {
+					compatible = "fsl,imx28-gpio", "fsl,mxs-gpio";
+					interrupts = <123>;
+					gpio-controller;
+					#gpio-cells = <2>;
+					interrupt-controller;
+					#interrupt-cells = <2>;
+				};
+
 				duart_pins_a: duart@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <0x3102 0x3112>;

arch/arm/mach-mxs/mach-mxs.c

@@ -30,8 +30,20 @@ static int __init mxs_icoll_add_irq_domain(struct device_node *np,
 	return 0;
 }
 
+static int __init mxs_gpio_add_irq_domain(struct device_node *np,
+				struct device_node *interrupt_parent)
+{
+	static int gpio_irq_base = MXS_GPIO_IRQ_START;
+
+	irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, NULL);
+	gpio_irq_base += 32;
+
+	return 0;
+}
+
 static const struct of_device_id mxs_irq_match[] __initconst = {
 	{ .compatible = "fsl,mxs-icoll", .data = mxs_icoll_add_irq_domain, },
+	{ .compatible = "fsl,mxs-gpio", .data = mxs_gpio_add_irq_domain, },
 	{ /* sentinel */ }
 };