efikamx: add mc13892 support / implement power off

This patch declares regulators for the efikamx. Use it also to power off the
efikamx.
Unfortunately, on the efikamx to2 boards, this doesn't work but they allow to
power off by setting GPIO 4 13 to high level instead of powering off through
the mc13892.
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/board-mx51_efikamx.c

@@ -25,6 +25,9 @@
 #include <linux/fsl_devices.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
+#include <linux/mfd/mc13892.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/consumer.h>
 
 #include <mach/common.h>
 #include <mach/hardware.h>
@@ -56,6 +59,10 @@
 #define EFIKAMX_RESET1_1	IMX_GPIO_NR(3, 2)
 #define EFIKAMX_RESET		IMX_GPIO_NR(1, 4)
 
+#define EFIKAMX_POWEROFF	IMX_GPIO_NR(4, 13)
+
+#define EFIKAMX_PMIC		IMX_GPIO_NR(1, 6)
+
 /* the pci ids pin have pull up. they're driven low according to board id */
 #define MX51_PAD_PCBID0	IOMUX_PAD(0x518, 0x130, 3, 0x0,   0, PAD_CTL_PUS_100K_UP)
 #define MX51_PAD_PCBID1	IOMUX_PAD(0x51C, 0x134, 3, 0x0,   0, PAD_CTL_PUS_100K_UP)
@@ -79,6 +86,9 @@ static iomux_v3_cfg_t mx51efikamx_pads[] = {
 	/* reset */
 	MX51_PAD_DI1_PIN13__GPIO3_2,
 	MX51_PAD_GPIO1_4__GPIO1_4,
+
+	/* power off */
+	MX51_PAD_CSI2_VSYNC__GPIO4_13,
 };
 
 /*   PCBID2  PCBID1 PCBID0  STATE
@@ -187,6 +197,46 @@ void mx51_efikamx_reset(void)
 		gpio_direction_output(EFIKAMX_RESET, 0);
 }
 
+static struct regulator *pwgt1, *pwgt2, *coincell;
+
+static void mx51_efikamx_power_off(void)
+{
+	if (!IS_ERR(coincell))
+		regulator_disable(coincell);
+
+	if (!IS_ERR(pwgt1) && !IS_ERR(pwgt2)) {
+		regulator_disable(pwgt2);
+		regulator_disable(pwgt1);
+	}
+	gpio_direction_output(EFIKAMX_POWEROFF, 1);
+}
+
+static int __init mx51_efikamx_power_init(void)
+{
+	if (machine_is_mx51_efikamx()) {
+		pwgt1 = regulator_get(NULL, "pwgt1");
+		pwgt2 = regulator_get(NULL, "pwgt2");
+		if (!IS_ERR(pwgt1) && !IS_ERR(pwgt2)) {
+			regulator_enable(pwgt1);
+			regulator_enable(pwgt2);
+		}
+		gpio_request(EFIKAMX_POWEROFF, "poweroff");
+		pm_power_off = mx51_efikamx_power_off;
+
+		/* enable coincell charger. maybe need a small power driver ? */
+		coincell = regulator_get(NULL, "coincell");
+		if (!IS_ERR(coincell)) {
+			regulator_set_voltage(coincell, 3000000, 3000000);
+			regulator_enable(coincell);
+		}
+
+		regulator_has_full_constraints();
+	}
+
+	return 0;
+}
+late_initcall(mx51_efikamx_power_init);
+
 static void __init mx51_efikamx_init(void)
 {
 	mxc_iomux_v3_setup_multiple_pads(mx51efikamx_pads,