ARM: EXYNOS: Adds G-Scaler device from Device Tree

This patch adds,
- 4 G-Scaler devices to the DT device list
- G-Scaler specific entries to the machine file
- binding documentation for G-Scaler entries
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com>
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Documentation/devicetree/bindings/media/exynos5-gsc.txt

+* Samsung Exynos5 G-Scaler device
+
+G-Scaler is used for scaling and color space conversion on EXYNOS5 SoCs.
+
+Required properties:
+- compatible: should be "samsung,exynos5-gsc"
+- reg: should contain G-Scaler physical address location and length.
+- interrupts: should contain G-Scaler interrupt number
+
+Example:
+
+gsc_0:  gsc@0x13e00000 {
+	compatible = "samsung,exynos5-gsc";
+	reg = <0x13e00000 0x1000>;
+	interrupts = <0 85 0>;
+};
+
+Aliases:
+Each G-Scaler node should have a numbered alias in the aliases node,
+in the form of gscN, N = 0...3. G-Scaler driver uses these aliases
+to retrieve the device IDs using "of_alias_get_id()" call.
+
+Example:
+
+aliases {
+	gsc0 =&gsc_0;
+	gsc1 =&gsc_1;
+	gsc2 =&gsc_2;
+	gsc3 =&gsc_3;
+};

arch/arm/boot/dts/exynos5250.dtsi

@@ -27,6 +27,10 @@ aliases {
 		spi0 = &spi_0;
 		spi1 = &spi_1;
 		spi2 = &spi_2;
+		gsc0 = &gsc_0;
+		gsc1 = &gsc_1;
+		gsc2 = &gsc_2;
+		gsc3 = &gsc_3;
 	};
 
 	gic:interrupt-controller@10481000 {
@@ -460,4 +464,28 @@ gpz: gpio-controller@03860000 {
 			#gpio-cells = <4>;
 		};
 	};
+
+	gsc_0:  gsc@0x13e00000 {
+		compatible = "samsung,exynos5-gsc";
+		reg = <0x13e00000 0x1000>;
+		interrupts = <0 85 0>;
+	};
+
+	gsc_1:  gsc@0x13e10000 {
+		compatible = "samsung,exynos5-gsc";
+		reg = <0x13e10000 0x1000>;
+		interrupts = <0 86 0>;
+	};
+
+	gsc_2:  gsc@0x13e20000 {
+		compatible = "samsung,exynos5-gsc";
+		reg = <0x13e20000 0x1000>;
+		interrupts = <0 87 0>;
+	};
+
+	gsc_3:  gsc@0x13e30000 {
+		compatible = "samsung,exynos5-gsc";
+		reg = <0x13e30000 0x1000>;
+		interrupts = <0 88 0>;
+	};
 };

arch/arm/mach-exynos/include/mach/map.h

@@ -121,6 +121,11 @@
 #define EXYNOS4_PA_SYSMMU_MFC_L		0x13620000
 #define EXYNOS4_PA_SYSMMU_MFC_R		0x13630000
 
+#define EXYNOS5_PA_GSC0			0x13E00000
+#define EXYNOS5_PA_GSC1			0x13E10000
+#define EXYNOS5_PA_GSC2			0x13E20000
+#define EXYNOS5_PA_GSC3			0x13E30000
+
 #define EXYNOS5_PA_SYSMMU_MDMA1		0x10A40000
 #define EXYNOS5_PA_SYSMMU_SSS		0x10A50000
 #define EXYNOS5_PA_SYSMMU_2D		0x10A60000

arch/arm/mach-exynos/mach-exynos5-dt.c

@@ -56,6 +56,14 @@ static const struct of_dev_auxdata exynos5250_auxdata_lookup[] __initconst = {
 	OF_DEV_AUXDATA("arm,pl330", EXYNOS5_PA_PDMA0, "dma-pl330.0", NULL),
 	OF_DEV_AUXDATA("arm,pl330", EXYNOS5_PA_PDMA1, "dma-pl330.1", NULL),
 	OF_DEV_AUXDATA("arm,pl330", EXYNOS5_PA_MDMA1, "dma-pl330.2", NULL),
+	OF_DEV_AUXDATA("samsung,exynos5-gsc", EXYNOS5_PA_GSC0,
+				"exynos-gsc.0", NULL),
+	OF_DEV_AUXDATA("samsung,exynos5-gsc", EXYNOS5_PA_GSC1,
+				"exynos-gsc.1", NULL),
+	OF_DEV_AUXDATA("samsung,exynos5-gsc", EXYNOS5_PA_GSC2,
+				"exynos-gsc.2", NULL),
+	OF_DEV_AUXDATA("samsung,exynos5-gsc", EXYNOS5_PA_GSC3,
+				"exynos-gsc.3", NULL),
 	{},
 };