ARM: iop32x: fix power off handling for the EM7210 board

This board was missed when converting all the others to proper
abstracted GPIO handling. Fix it up the right way by requesting
and driving GPIO line 0 high through gpiolib to power off the
machine.

Cc: Arnaud Patard <arnaud.patard@rtp-net.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-iop32x/em7210.c

@@ -23,6 +23,7 @@
 #include <linux/mtd/physmap.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
+#include <linux/gpio.h>
 #include <mach/hardware.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -176,11 +177,35 @@ static struct platform_device em7210_serial_device = {
 	.resource	= &em7210_uart_resource,
 };
 
+#define EM7210_HARDWARE_POWER 0
+
 void em7210_power_off(void)
 {
-	*IOP3XX_GPOE &= 0xfe;
-	*IOP3XX_GPOD |= 0x01;
+	int ret;
+
+	ret = gpio_direction_output(EM7210_HARDWARE_POWER, 1);
+	if (ret)
+		pr_crit("could not drive power off GPIO high\n");
+}
+
+static int __init em7210_request_gpios(void)
+{
+	int ret;
+
+	if (!machine_is_em7210())
+		return 0;
+
+	ret = gpio_request(EM7210_HARDWARE_POWER, "power");
+	if (ret) {
+		pr_err("could not request power off GPIO\n");
+		return 0;
+	}
+
+	pm_power_off = em7210_power_off;
+
+	return 0;
 }
+device_initcall(em7210_request_gpios);
 
 static void __init em7210_init_machine(void)
 {
@@ -194,9 +219,6 @@ static void __init em7210_init_machine(void)
 
 	i2c_register_board_info(0, em7210_i2c_devices,
 		ARRAY_SIZE(em7210_i2c_devices));
-
-
-	pm_power_off = em7210_power_off;
 }
 
 MACHINE_START(EM7210, "Lanner EM7210")