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| author |   Phil Reid <preid@electromag.com.au> | 2018-02-19 17:25:20 +0800 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2018-02-22 16:08:59 +0100 |
| commit | fa2b7fae8426e2cd690278e514abcc09e4f89a8f (patch) | |
| tree | 2869ac85c88bbd39c84532d0b2a913f37451c5da /drivers/pinctrl/pinctrl-mcp23s08.c | |
| parent | dt-bindings: pinctrl: mcp23s08: add documentation for drive-open-drain (diff) | |
| download | linux-dev-fa2b7fae8426e2cd690278e514abcc09e4f89a8f.tar.xz linux-dev-fa2b7fae8426e2cd690278e514abcc09e4f89a8f.zip | |
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>
Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-mcp23s08.c | 7 |
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); |