mfd: dt: tps65910: Add power off control

Add DT property "ti,system-power-controller" telling whether or not this
pmic is in charge of controlling the system power, so the power off
routine can be hooked up to system call "pm_power_off".

Based on the work by:
Dan Willemsen <[e-mail]>

Signed-off-by: Bill Huang <[e-mail]>
Tested-by: Stephen Warren <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

Documentation/devicetree/bindings/mfd/tps65910.txt

···
   in TPS6591X datasheet)
 - ti,en-gpio-sleep: enable sleep control for gpios
   There should be 9 entries here, one for each gpio.
+- ti,system-power-controller: Telling whether or not this pmic is controlling
+  the system power.
 
 Regulator Optional properties:
 - ti,regulator-ext-sleep-control: enable external sleep
···
 
 		#interrupt-cells = <2>;
 		interrupt-controller;
+
+		ti,system-power-controller;
 
 		ti,vmbch-threshold = 0;
 		ti,vmbch2-threshold = 0;

drivers/mfd/tps65910.c

···
 
 	board_info->irq = client->irq;
 	board_info->irq_base = -1;
+	board_info->pm_off = of_property_read_bool(np,
+			"ti,system-power-controller");
 
 	return board_info;
 }
···
 	return NULL;
 }
 #endif
+
+static struct i2c_client *tps65910_i2c_client;
+static void tps65910_power_off(void)
+{
+	struct tps65910 *tps65910;
+
+	tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);
+
+	if (tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
+			DEVCTRL_PWR_OFF_MASK) < 0)
+		return;
+
+	tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
+			DEVCTRL_DEV_ON_MASK);
+}
 
 static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
 					const struct i2c_device_id *id)
···
 	tps65910_irq_init(tps65910, init_data->irq, init_data);
 	tps65910_ck32k_init(tps65910, pmic_plat_data);
 	tps65910_sleepinit(tps65910, pmic_plat_data);
+
+	if (pmic_plat_data->pm_off && !pm_power_off) {
+		tps65910_i2c_client = i2c;
+		pm_power_off = tps65910_power_off;
+	}
 
 	return ret;
 }

include/linux/mfd/tps65910.h

···
 
 
 /*Register DEVCTRL  (0x80) register.RegisterDescription */
+#define DEVCTRL_PWR_OFF_MASK				0x80
+#define DEVCTRL_PWR_OFF_SHIFT				7
 #define DEVCTRL_RTC_PWDN_MASK				0x40
 #define DEVCTRL_RTC_PWDN_SHIFT				6
 #define DEVCTRL_CK32K_CTRL_MASK				0x20
···
 	int vmbch2_threshold;
 	bool en_ck32k_xtal;
 	bool en_dev_slp;
+	bool pm_off;
 	struct tps65910_sleep_keepon_data *slp_keepon;
 	bool en_gpio_sleep[TPS6591X_MAX_NUM_GPIO];
 	unsigned long regulator_ext_sleep_control[TPS65910_NUM_REGS];