dts: socfpga: Add support for SD/MMC on the SOCFPGA platform

Introduce "altr,socfpga-dw-mshc" to enable Altera's SOCFPGA platform
specific implementation of the dw_mmc driver.

Also add the "syscon" binding to the "altr,sys-mgr" node. The clock
driver can use the syscon driver to toggle the register for the SD/MMC
clock phase shift settings.

Finally, fix an indentation error for the sysmgr node.
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Acked-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Tested-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Chris Ball <chris@printf.net>

Documentation/devicetree/bindings/mmc/socfpga-dw-mshc.txt

+* Altera SOCFPGA specific extensions to the Synopsys Designware Mobile
+  Storage Host Controller
+
+The Synopsys designware mobile storage host controller is used to interface
+a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
+differences between the core Synopsys dw mshc controller properties described
+by synopsys-dw-mshc.txt and the properties used by the Altera SOCFPGA specific
+extensions to the Synopsys Designware Mobile Storage Host Controller.
+
+Required Properties:
+
+* compatible: should be
+	- "altr,socfpga-dw-mshc": for Altera's SOCFPGA platform
+
+Example:
+
+	mmc: dwmmc0@ff704000 {
+		compatible = "altr,socfpga-dw-mshc";
+		reg = <0xff704000 0x1000>;
+		interrupts = <0 129 4>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};

arch/arm/boot/dts/socfpga.dtsi

@@ -499,6 +499,17 @@ L2: l2-cache@fffef000 {
 			arm,data-latency = <2 1 1>;
 		};
 
+		mmc: dwmmc0@ff704000 {
+			compatible = "altr,socfpga-dw-mshc";
+			reg = <0xff704000 0x1000>;
+			interrupts = <0 139 4>;
+			fifo-depth = <0x400>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&l4_mp_clk>, <&sdmmc_clk>;
+			clock-names = "biu", "ciu";
+		};
+
 		/* Local timer */
 		timer@fffec600 {
 			compatible = "arm,cortex-a9-twd-timer";
@@ -553,8 +564,8 @@ rstmgr@ffd05000 {
 		};
 
 		sysmgr@ffd08000 {
-				compatible = "altr,sys-mgr";
-				reg = <0xffd08000 0x4000>;
-			};
+			compatible = "altr,sys-mgr", "syscon";
+			reg = <0xffd08000 0x4000>;
+		};
 	};
 };

arch/arm/boot/dts/socfpga_arria5.dtsi

@@ -27,6 +27,17 @@ osc1 {
 			};
 		};
 
+		dwmmc0@ff704000 {
+			num-slots = <1>;
+			supports-highspeed;
+			broken-cd;
+
+			slot@0 {
+				reg = <0>;
+				bus-width = <4>;
+			};
+		};
+
 		serial0@ffc02000 {
 			clock-frequency = <100000000>;
 		};

arch/arm/boot/dts/socfpga_cyclone5.dtsi

@@ -28,6 +28,17 @@ osc1 {
 			};
 		};
 
+		dwmmc0@ff704000 {
+			num-slots = <1>;
+			supports-highspeed;
+			broken-cd;
+
+			slot@0 {
+				reg = <0>;
+				bus-width = <4>;
+			};
+		};
+
 		ethernet@ff702000 {
 			phy-mode = "rgmii";
 			phy-addr = <0xffffffff>; /* probe for phy addr */

arch/arm/boot/dts/socfpga_vt.dts

@@ -41,6 +41,17 @@ osc1 {
 			};
 		};
 
+		dwmmc0@ff704000 {
+			num-slots = <1>;
+			supports-highspeed;
+			broken-cd;
+
+			slot@0 {
+				reg = <0>;
+				bus-width = <4>;
+			};
+		};
+
 		ethernet@ff700000 {
 			phy-mode = "gmii";
 			status = "okay";