MIPS: SEAD3: Use generic restart-poweroff driver

Remove the custom platform code to restart when instructed to power off,
instead relying upon the generic restart-poweroff driver probed via DT
to do the same thing.

Remove also the halt implementation, which is incorrect. The generic
MIPS version will hang the system as halt should.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Jacek Anaszewski <j.anaszewski@samsung.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/14057/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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

@@ -103,6 +103,10 @@
 			offset = <0x50>;
 			mask = <0x4d>;
 		};
+
+		poweroff {
+			compatible = "restart-poweroff";
+		};
 	};
 
 	system-controller@1f000200 {

arch/mips/configs/sead3_defconfig

@@ -81,6 +81,7 @@ CONFIG_I2C_CHARDEV=y
 # CONFIG_I2C_HELPER_AUTO is not set
 CONFIG_SPI=y
 CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_RESTART=y
 CONFIG_POWER_RESET_SYSCON=y
 CONFIG_SENSORS_ADT7475=y
 CONFIG_BACKLIGHT_LCD_SUPPORT=y

arch/mips/mti-sead3/Makefile

@@ -13,6 +13,5 @@ obj-y += sead3-display.o
 obj-y += sead3-dtshim.o
 obj-y += sead3-init.o
 obj-y += sead3-int.o
-obj-y += sead3-reset.o
 obj-y += sead3-setup.o
 obj-y += sead3-time.o

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

@@ -1,31 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
- */
-#include <linux/io.h>
-#include <linux/pm.h>
-
-#include <asm/reboot.h>
-
-#define SOFTRES_REG	0x1f000050
-#define GORESET		0x4d
-
-static void mips_machine_halt(void)
-{
-	unsigned int __iomem *softres_reg =
-		ioremap(SOFTRES_REG, sizeof(unsigned int));
-
-	__raw_writel(GORESET, softres_reg);
-}
-
-static int __init mips_reboot_setup(void)
-{
-	_machine_halt = mips_machine_halt;
-	pm_power_off = mips_machine_halt;
-
-	return 0;
-}
-arch_initcall(mips_reboot_setup);