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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