[PATCH v2 5/7] pinctrl: mcp23s08: add open drain configuration for irq pinctrl

[Phil Reid <preid@xxxxxxxxxxxxxxxxx>]

The mcp23s08 series device can be configured for wired and interupts
using an external pullup and open drain output via the IOCON_ODR bit.
And "microchip,irq-open-drain" property to enable this.

Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-mcp23s08.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 8d356df..150f216 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -780,6 +780,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 {
 	int status, ret;
 	bool mirror = false;
+	bool open_drain = false;
 
 	mutex_init(&mcp->lock);
 
@@ -876,6 +877,8 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 					      "microchip,irq-active-high");
 
 		mirror = device_property_read_bool(dev, "microchip,irq-mirror");
+		open_drain = device_property_read_bool(dev,
+						    "microchip,irq-open-drain");
 	}
 
 	if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
@@ -891,6 +894,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 		if (mirror)
 			status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
 
+		if (open_drain)
+			status |= IOCON_ODR | (IOCON_ODR << 8);
+
 		if (type == MCP_TYPE_S18 || type == MCP_TYPE_018)
 			status |= IOCON_INTCC | (IOCON_INTCC << 8);
 
-- 
1.8.3.1

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