mfd: as3722: Disable auto-power-on when AC OK

On ams AS3722, power on when AC OK is enabled by default.
Making this option as disable by default and enable only
when platform need this explicitly.

Signed-off-by: Laxman Dewangan <[e-mail]>
Reviewed-by: Bibek Basu <[e-mail]>
Tested-by: Bibek Basu <[e-mail]>
Signed-off-by: Marcel Ziswiler <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

Documentation/devicetree/bindings/mfd/as3722.txt

···
 - ams,enable-internal-i2c-pullup: Boolean property, to enable internal pullup on
 	i2c scl/sda pins. Missing this will disable internal pullup on i2c
 	scl/sda lines.
+- ams,enable-ac-ok-power-on: Boolean property, to enable exit out of power off
+	mode with AC_OK pin (pin enabled in power off mode).
 
 Optional submodule and their properties:
 =======================================

drivers/mfd/as3722.c

···
 					"ams,enable-internal-int-pullup");
 	as3722->en_intern_i2c_pullup = of_property_read_bool(np,
 					"ams,enable-internal-i2c-pullup");
+	as3722->en_ac_ok_pwr_on = of_property_read_bool(np,
+					"ams,enable-ac-ok-power-on");
 	as3722->irq_flags = irqd_get_trigger_type(irq_data);
 	dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
 	return 0;
···
 	struct as3722 *as3722;
 	unsigned long irq_flags;
 	int ret;
+	u8 val = 0;
 
 	as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
 	if (!as3722)
···
 	ret = as3722_configure_pullups(as3722);
 	if (ret < 0)
 		return ret;
+
+	if (as3722->en_ac_ok_pwr_on)
+		val = AS3722_CTRL_SEQU1_AC_OK_PWR_ON;
+	ret = as3722_update_bits(as3722, AS3722_CTRL_SEQU1_REG,
+			AS3722_CTRL_SEQU1_AC_OK_PWR_ON, val);
+	if (ret < 0) {
+		dev_err(as3722->dev, "CTRLsequ1 update failed: %d\n", ret);
+		return ret;
+	}
 
 	ret = devm_mfd_add_devices(&i2c->dev, -1, as3722_devs,
 				   ARRAY_SIZE(as3722_devs), NULL, 0,

include/linux/mfd/as3722.h

···
 #define AS3722_ADC1_CONV_NOTREADY			BIT(7)
 #define AS3722_ADC1_SOURCE_SELECT_MASK			0x1F
 
+#define AS3722_CTRL_SEQU1_AC_OK_PWR_ON			BIT(0)
+
 /* GPIO modes */
 #define AS3722_GPIO_MODE_MASK				0x07
 #define AS3722_GPIO_MODE_INPUT				0x00
···
 	unsigned long irq_flags;
 	bool en_intern_int_pullup;
 	bool en_intern_i2c_pullup;
+	bool en_ac_ok_pwr_on;
 	struct regmap_irq_chip_data *irq_data;
 };