[PATCH V3 4/5] mfd: palmas: support IRQ inversion at the board level

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

Implement the new DT property ti,irq-externally-inverted, and add an
equivalent platform data field to match. This allows the driver to
correctly automatically configure the IRQ output polarity when the board
or SoC contains an inverter between the Palmas IRQ output and IRQ
controller input.

Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
v3:
* Use an IRQD flag to represent the data, rather than a custom DT property.
v2:
* Split V1's patch 1/2 into separate patches 1/3 and 2/3.
---
 drivers/mfd/palmas.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
index d280d789e55a..3281d4103e9d 100644
--- a/drivers/mfd/palmas.c
+++ b/drivers/mfd/palmas.c
@@ -292,7 +292,8 @@ static int palmas_set_pdata_irq_flag(struct i2c_client *i2c,
 		return -EINVAL;
 	}
 
-	pdata->irq_flags = irqd_get_trigger_type(irq_data);
+	pdata->irq_flags = irqd_get_trigger_type(irq_data) |
+			   irqd_get_src_dst_inverted(irq_data);
 	dev_info(&i2c->dev, "Irq flag is 0x%08x\n", pdata->irq_flags);
 	return 0;
 }
@@ -447,6 +448,8 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
 		reg = PALMAS_POLARITY_CTRL_INT_POLARITY;
 	else
 		reg = 0;
+	if (pdata->irq_flags & IRQ_SRC_DST_INVERTED)
+		reg ^= PALMAS_POLARITY_CTRL_INT_POLARITY;
 	ret = palmas_update_bits(palmas, PALMAS_PU_PD_OD_BASE,
 			PALMAS_POLARITY_CTRL, PALMAS_POLARITY_CTRL_INT_POLARITY,
 			reg);
-- 
1.8.1.5