MIPS: SEAD3: Reset via generic syscon-reboot driver & DT

Remove the SEAD3 implementation of _machine_restart & instead make use
of the generic syscon-reboot driver probed via device tree.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14056/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/boot/dts/mti/sead3.dts

@@ -93,6 +93,18 @@
 		};
 	};
 
+	fpga_regs: system-controller@1f000000 {
+		compatible = "mti,sead3-fpga", "syscon", "simple-mfd";
+		reg = <0x1f000000 0x200>;
+
+		reboot {
+			compatible = "syscon-reboot";
+			regmap = <&fpga_regs>;
+			offset = <0x50>;
+			mask = <0x4d>;
+		};
+	};
+
 	system-controller@1f000200 {
 		compatible = "mti,sead3-cpld", "syscon", "simple-mfd";
 		reg = <0x1f000200 0x300>;

arch/mips/configs/sead3_defconfig

@@ -80,8 +80,9 @@ CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=y
 # CONFIG_I2C_HELPER_AUTO is not set
 CONFIG_SPI=y
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_SYSCON=y
 CONFIG_SENSORS_ADT7475=y
-CONFIG_MFD_SYSCON=y
 CONFIG_BACKLIGHT_LCD_SUPPORT=y
 CONFIG_LCD_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_CLASS_DEVICE=y

arch/mips/mti-sead3/sead3-reset.c

@@ -13,14 +13,6 @@
 #define SOFTRES_REG	0x1f000050
 #define GORESET		0x4d
 
-static void mips_machine_restart(char *command)
-{
-	unsigned int __iomem *softres_reg =
-		ioremap(SOFTRES_REG, sizeof(unsigned int));
-
-	__raw_writel(GORESET, softres_reg);
-}
-
 static void mips_machine_halt(void)
 {
 	unsigned int __iomem *softres_reg =
@@ -31,7 +23,6 @@ static void mips_machine_halt(void)
 
 static int __init mips_reboot_setup(void)
 {
-	_machine_restart = mips_machine_restart;
 	_machine_halt = mips_machine_halt;
 	pm_power_off = mips_machine_halt;