ARM: nspire: Use syscon-reboot to handle restart

Writing this bit can be handled by the DT syscon-reboot driver.
Enable that driver and remove the machine_desc version.
Signed-off-by: Andrew Davis <afd@ti.com>
Tested-by: Fabian Vogt <fabian@ritter-vogt.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Fabian Vogt <fabian@ritter-vogt.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-nspire/Kconfig

@@ -9,5 +9,7 @@ config ARCH_NSPIRE
 	select ARM_VIC
 	select ARM_TIMER_SP804
 	select NSPIRE_TIMER
+	select POWER_RESET
+	select POWER_RESET_SYSCON
 	help
 	  This enables support for systems using the TI-NSPIRE CPU

arch/arm/mach-nspire/mmio.h

@@ -5,9 +5,6 @@
  *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
  */
 
-#define NSPIRE_MISC_PHYS_BASE		0x900A0000
-#define NSPIRE_MISC_HWRESET		0x08
-
 #define NSPIRE_PWR_PHYS_BASE		0x900B0000
 #define NSPIRE_PWR_VIRT_BASE		0xFEEB0000
 #define NSPIRE_PWR_BUS_DISABLE1		0x18

arch/arm/mach-nspire/nspire.c

@@ -20,16 +20,6 @@ static const char *const nspire_dt_match[] __initconst = {
 	NULL,
 };
 
-static void nspire_restart(enum reboot_mode mode, const char *cmd)
-{
-	void __iomem *base = ioremap(NSPIRE_MISC_PHYS_BASE, SZ_4K);
-	if (!base)
-		return;
-
-	writel(2, base + NSPIRE_MISC_HWRESET);
-}
-
 DT_MACHINE_START(NSPIRE, "TI-NSPIRE")
 	.dt_compat	= nspire_dt_match,
-	.restart	= nspire_restart,
 MACHINE_END