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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>
This commit is contained in:
Alexander Stein 2014-12-01 08:26:00 +01:00 committed by Linus Walleij
parent 0e9a5edf5d
commit a4e635544f
2 changed files with 25 additions and 7 deletions
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2
Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
View File

@ -57,6 +57,8 @@ Optional device specific properties:
occurred on. If it is not set, the interrupt are only generated for the
bank they belong to.
On devices with only one interrupt output this property is useless.
- microchip,irq-active-high: Sets the INTPOL flag in the IOCON register. This
configures the IRQ output polarity as active high.
Example I2C (with interrupt):
gpiom1: gpio@20 {

30
drivers/gpio/gpio-mcp23s08.c
View File

@ -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);