Hi,
On Fri, Oct 06, 2017 at 01:08:09PM +0800, Phil Reid wrote:
> 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>
Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>
-- Sebastian
> ---
> 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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