serial: UniPhier: support OF configuration

This commit implements the ofdata_to_platdata handler for the UniPhier
serial driver and adds serial device nodes to the device tree sources.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

arch/arm/dts/uniphier-ph1-ld4-ref.dts

@@ -21,5 +21,14 @@
 
 	chosen {
 		bootargs = "console=ttyPS0,115200 earlyprintk";
+		stdout-path = &uart0;
 	};
 };
+
+&uart0 {
+       status = "okay";
+};
+
+&uart1 {
+       status = "okay";
+};

arch/arm/dts/uniphier-ph1-ld4.dtsi

@@ -28,5 +28,33 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
+
+		uart0: serial@54006800 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006800 0x20>;
+			clock-frequency = <36864000>;
+		};
+
+		uart1: serial@54006900 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006900 0x20>;
+			clock-frequency = <36864000>;
+		};
+
+		uart2: serial@54006a00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006a00 0x20>;
+			clock-frequency = <36864000>;
+		};
+
+		uart3: serial@54006b00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006b00 0x20>;
+			clock-frequency = <36864000>;
+		};
 	};
 };

arch/arm/dts/uniphier-ph1-pro4-ref.dts

@@ -21,5 +21,14 @@
 
 	chosen {
 		bootargs = "console=ttyPS0,115200 earlyprintk";
+		stdout-path = &uart0;
 	};
 };
+
+&uart0 {
+       status = "okay";
+};
+
+&uart1 {
+       status = "okay";
+};

arch/arm/dts/uniphier-ph1-pro4.dtsi

@@ -34,5 +34,33 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
+
+		uart0: serial@54006800 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006800 0x20>;
+			clock-frequency = <73728000>;
+		};
+
+		uart1: serial@54006900 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006900 0x20>;
+			clock-frequency = <73728000>;
+		};
+
+		uart2: serial@54006a00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006a00 0x20>;
+			clock-frequency = <73728000>;
+		};
+
+		uart3: serial@54006b00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006b00 0x20>;
+			clock-frequency = <73728000>;
+		};
 	};
 };

arch/arm/dts/uniphier-ph1-sld8-ref.dts

@@ -21,5 +21,14 @@
 
 	chosen {
 		bootargs = "console=ttyPS0,115200 earlyprintk";
+		stdout-path = &uart0;
 	};
 };
+
+&uart0 {
+       status = "okay";
+};
+
+&uart1 {
+       status = "okay";
+};

arch/arm/dts/uniphier-ph1-sld8.dtsi

@@ -28,5 +28,33 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
+
+		uart0: serial@54006800 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006800 0x20>;
+			clock-frequency = <80000000>;
+		};
+
+		uart1: serial@54006900 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006900 0x20>;
+			clock-frequency = <80000000>;
+		};
+
+		uart2: serial@54006a00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006a00 0x20>;
+			clock-frequency = <80000000>;
+		};
+
+		uart3: serial@54006b00 {
+			compatible = "panasonic,uniphier-uart";
+			status = "disabled";
+			reg = <0x54006b00 0x20>;
+			clock-frequency = <80000000>;
+		};
 	};
 };

drivers/serial/serial_uniphier.c

@@ -11,6 +11,7 @@
 #include <dm/device.h>
 #include <dm/platform_data/serial-uniphier.h>
 #include <serial.h>
+#include <fdtdec.h>
 
 #define UART_REG(x)					\
 	u8 x;						\
@@ -113,19 +114,21 @@ static int uniphier_serial_remove(struct udevice *dev)
 }
 
 #ifdef CONFIG_OF_CONTROL
-static const struct udevice_id uniphier_uart_of_match = {
-	{ .compatible = "panasonic,uniphier-uart"},
+static const struct udevice_id uniphier_uart_of_match[] = {
+	{ .compatible = "panasonic,uniphier-uart" },
 	{},
 };
 
 static int uniphier_serial_ofdata_to_platdata(struct udevice *dev)
 {
-	/*
-	 * TODO: Masahiro Yamada (yamada.m@jp.panasonic.com)
-	 *
-	 * Implement conversion code from DTB to platform data
-	 * when supporting CONFIG_OF_CONTROL on UniPhir platform.
-	 */
+	struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
+	DECLARE_GLOBAL_DATA_PTR;
+
+	plat->base = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+	plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+				       "clock-frequency", 0);
+
+	return 0;
 }
 #endif