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 <ldewangan@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Tested-by: Bibek Basu <bbasu@nvidia.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 17 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/as3722.txt b/Documentation/devicetree/bindings/mfd/as3722.txt
index 5297b2210704..2a665741d7fe 100644
--- a/Documentation/devicetree/bindings/mfd/as3722.txt
+++ b/Documentation/devicetree/bindings/mfd/as3722.txt
@@ -20,6 +20,8 @@ Optional properties:
 - 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:
 =======================================
diff --git a/drivers/mfd/as3722.c b/drivers/mfd/as3722.c
index f87342c211bc..4d069ed21ff6 100644
--- a/drivers/mfd/as3722.c
+++ b/drivers/mfd/as3722.c
@@ -349,6 +349,8 @@ static int as3722_i2c_of_probe(struct i2c_client *i2c,
                                         "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;
@@ -360,6 +362,7 @@ static int as3722_i2c_probe(struct i2c_client *i2c,
         struct as3722 *as3722;
         unsigned long irq_flags;
         int ret;
+        u8 val = 0;
 
         as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
         if (!as3722)
@@ -398,6 +401,15 @@ static int as3722_i2c_probe(struct i2c_client *i2c,
         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,
                                    regmap_irq_get_domain(as3722->irq_data));
diff --git a/include/linux/mfd/as3722.h b/include/linux/mfd/as3722.h
index 51e6f9414575..b404a5af9bba 100644
--- a/include/linux/mfd/as3722.h
+++ b/include/linux/mfd/as3722.h
@@ -296,6 +296,8 @@
 #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
@@ -391,6 +393,7 @@ struct as3722 {
         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;
 };