aspeed: Device Tree configuration for Reset Driver

Add Reset Driver configuration to ast2500 SoC Device Tree and bindings
for various reset signals

Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/ast2500-evb.dts

@@ -21,3 +21,18 @@
 &sdrammc {
 	clock-frequency = <400000000>;
 };
+
+&wdt1 {
+	u-boot,dm-pre-reloc;
+	status = "okay";
+};
+
+&wdt2 {
+	u-boot,dm-pre-reloc;
+	status = "okay";
+};
+
+&wdt3 {
+	u-boot,dm-pre-reloc;
+	status = "okay";
+};

arch/arm/dts/ast2500-u-boot.dtsi

@@ -1,4 +1,5 @@
 #include <dt-bindings/clock/ast2500-scu.h>
+#include <dt-bindings/reset/ast2500-reset.h>
 
 #include "ast2500.dtsi"
 
@@ -11,12 +12,21 @@
 		#reset-cells = <1>;
 	};
 
+	rst: reset-controller {
+		u-boot,dm-pre-reloc;
+		compatible = "aspeed,ast2500-reset";
+		aspeed,wdt = <&wdt1>;
+		#reset-cells = <1>;
+	};
+
 	sdrammc: sdrammc@1e6e0000 {
 		u-boot,dm-pre-reloc;
 		compatible = "aspeed,ast2500-sdrammc";
 		reg = <0x1e6e0000 0x174
 			0x1e6e0200 0x1d4 >;
+		#reset-cells = <1>;
 		clocks = <&scu PLL_MPLL>;
+		resets = <&rst AST_RESET_SDRAM>;
 	};
 
 	ahb {

include/dt-bindings/reset/ast2500-reset.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2017 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _ABI_MACH_ASPEED_AST2500_RESET_H_
+#define _ABI_MACH_ASPEED_AST2500_RESET_H_
+
+/*
+ * The values are intentionally layed out as flags in
+ * WDT reset parameter.
+ */
+
+#define AST_RESET_SOC			0
+#define AST_RESET_CHIP			1
+#define AST_RESET_CPU			(1 << 1)
+#define AST_RESET_ARM			(1 << 2)
+#define AST_RESET_COPROC		(1 << 3)
+#define AST_RESET_SDRAM			(1 << 4)
+#define AST_RESET_AHB			(1 << 5)
+#define AST_RESET_I2C			(1 << 6)
+#define AST_RESET_MAC1			(1 << 7)
+#define AST_RESET_MAC2			(1 << 8)
+#define AST_RESET_GCRT			(1 << 9)
+#define AST_RESET_USB20			(1 << 10)
+#define AST_RESET_USB11_HOST		(1 << 11)
+#define AST_RESET_USB11_HID		(1 << 12)
+#define AST_RESET_VIDEO			(1 << 13)
+#define AST_RESET_HAC			(1 << 14)
+#define AST_RESET_LPC			(1 << 15)
+#define AST_RESET_SDIO			(1 << 16)
+#define AST_RESET_MIC			(1 << 17)
+#define AST_RESET_CRT2D			(1 << 18)
+#define AST_RESET_PWM			(1 << 19)
+#define AST_RESET_PECI			(1 << 20)
+#define AST_RESET_JTAG			(1 << 21)
+#define AST_RESET_ADC			(1 << 22)
+#define AST_RESET_GPIO			(1 << 23)
+#define AST_RESET_MCTP			(1 << 24)
+#define AST_RESET_XDMA			(1 << 25)
+#define AST_RESET_SPI			(1 << 26)
+#define AST_RESET_MISC			(1 << 27)
+
+#endif  /* _ABI_MACH_ASPEED_AST2500_RESET_H_ */