pinctrl: mcp23s08: add open drain configuration for irq output

The mcp23s08 series device can be configured for wired and interrupts
using an external pull-up and open drain output via the IOCON_ODR bit.
And "drive-open-drain" property to enable this.

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Phil Reid <preid@electromag.com.au>
Reviewed-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 832775709eff..022307dd4b54 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -771,6 +771,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
 {
         int status, ret;
         bool mirror = false;
+        bool open_drain = false;
         struct regmap_config *one_regmap_config = NULL;
         int raw_chip_address = (addr & ~0x40) >> 1;
 
@@ -883,10 +884,11 @@ 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, "drive-open-drain");
         }
 
         if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
-             mcp->irq_active_high) {
+             mcp->irq_active_high || open_drain) {
                 /* mcp23s17 has IOCON twice, make sure they are in sync */
                 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
                 status |= IOCON_HAEN | (IOCON_HAEN << 8);
@@ -898,6 +900,9 @@ 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);