diff options
| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2014-12-01 08:26:00 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-12-03 14:34:45 +0100 |
| commit | a4e635544f65021c346f2097daa0c8dd63dd6221 (patch) | |
| tree | 0221e40e110afa800db6e4fa210fdcaf4e78f998 /drivers/gpio/gpio-mcp23s08.c | |
| parent | gpio: fix deferred probe detection for legacy API (diff) | |
| download | linux-a4e635544f65021c346f2097daa0c8dd63dd6221.tar.xz linux-a4e635544f65021c346f2097daa0c8dd63dd6221.zip | |
gpio: mcp23s08: Add option to configure IRQ output polarity as active high
Default is active low, but if property is specified in DT set INTPOL flag.
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mcp23s08.c')
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 0d58440eb8da..93ee7da2d8b0 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -65,6 +65,7 @@ struct mcp23s08_ops { struct mcp23s08 { u8 addr; + bool irq_active_high; u16 cache[11]; u16 irq_rise; @@ -476,6 +477,7 @@ static int mcp23s08_irq_setup(struct mcp23s08 *mcp) { struct gpio_chip *chip = &mcp->chip; int err, irq, j; + unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED; mutex_init(&mcp->irq_lock); @@ -484,10 +486,13 @@ static int mcp23s08_irq_setup(struct mcp23s08 *mcp) if (!mcp->irq_domain) return -ENODEV; + if (mcp->irq_active_high) + irqflags |= IRQF_TRIGGER_HIGH; + else + irqflags |= IRQF_TRIGGER_LOW; + err = devm_request_threaded_irq(chip->dev, mcp->irq, NULL, mcp23s08_irq, - IRQF_TRIGGER_LOW | IRQF_ONESHOT | - IRQF_SHARED, - dev_name(chip->dev), mcp); + irqflags, dev_name(chip->dev), mcp); if (err != 0) { dev_err(chip->dev, "unable to request IRQ#%d: %d\n", mcp->irq, err); @@ -589,6 +594,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, mcp->data = data; mcp->addr = addr; + mcp->irq_active_high = false; mcp->chip.direction_input = mcp23s08_direction_input; mcp->chip.get = mcp23s08_get; @@ -648,14 +654,24 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, goto fail; mcp->irq_controller = pdata->irq_controller; - if (mcp->irq && mcp->irq_controller && (type == MCP_TYPE_017)) - mirror = pdata->mirror; + if (mcp->irq && mcp->irq_controller) { + mcp->irq_active_high = of_property_read_bool(mcp->chip.of_node, + "microchip,irq-active-high"); - if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror) { + if (type == MCP_TYPE_017) + mirror = pdata->mirror; + } + + if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror || + mcp->irq_active_high) { /* mcp23s17 has IOCON twice, make sure they are in sync */ status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8)); status |= IOCON_HAEN | (IOCON_HAEN << 8); - status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8)); + if (mcp->irq_active_high) + status |= IOCON_INTPOL | (IOCON_INTPOL << 8); + else + status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8)); + if (mirror) status |= IOCON_MIRROR | (IOCON_MIRROR << 8); |