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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>
This commit is contained in:
Phil Reid 2018-02-19 17:25:20 +08:00 committed by Linus Walleij
parent 39aba4714d
commit fa2b7fae84
1 changed files with 6 additions and 1 deletions
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7
drivers/pinctrl/pinctrl-mcp23s08.c
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@ -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);