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authorRob Herring <rob.herring@calxeda.com>2011-08-10 16:31:46 -0500
committerGrant Likely <grant.likely@secretlab.ca>2011-10-26 23:15:28 +0200
commit76c05c8a0d56faf210cb9681786bb3e17cd59793 (patch)
tree7397414a99102c283be83d5ac1928878ae3c1b12 /drivers/gpio
parenteb9ae7f2a38135761496d317c08c87f38c7cafe3 (diff)
downloadtalos-op-linux-76c05c8a0d56faf210cb9681786bb3e17cd59793.tar.gz
talos-op-linux-76c05c8a0d56faf210cb9681786bb3e17cd59793.zip
gpio: pl061: add DT binding support
This adds devicetree binding support to the ARM pl061 driver removing the platform_data dependency. When DT binding is used, the gpio numbering is assigned dynamically. For now, interrupts are not supported with DT until irqdomains learn dynamic irq assignment. Rather than add another case of -1, updating the driver to use NO_IRQ. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-pl061.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index 2c5a18f32bf3..093c90bd3c1d 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -118,7 +118,7 @@ static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
- if (chip->irq_base == (unsigned) -1)
+ if (chip->irq_base == NO_IRQ)
return -EINVAL;
return chip->irq_base + offset;
@@ -246,6 +246,18 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
if (chip == NULL)
return -ENOMEM;
+ pdata = dev->dev.platform_data;
+ if (pdata) {
+ chip->gc.base = pdata->gpio_base;
+ chip->irq_base = pdata->irq_base;
+ } else if (dev->dev.of_node) {
+ chip->gc.base = -1;
+ chip->irq_base = NO_IRQ;
+ } else {
+ ret = -ENODEV;
+ goto free_mem;
+ }
+
if (!request_mem_region(dev->res.start,
resource_size(&dev->res), "pl061")) {
ret = -EBUSY;
@@ -267,14 +279,11 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
chip->gc.get = pl061_get_value;
chip->gc.set = pl061_set_value;
chip->gc.to_irq = pl061_to_irq;
- chip->gc.base = pdata->gpio_base;
chip->gc.ngpio = PL061_GPIO_NR;
chip->gc.label = dev_name(&dev->dev);
chip->gc.dev = &dev->dev;
chip->gc.owner = THIS_MODULE;
- chip->irq_base = pdata->irq_base;
-
ret = gpiochip_add(&chip->gc);
if (ret)
goto iounmap;
@@ -283,7 +292,7 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
* irq_chip support
*/
- if (chip->irq_base == (unsigned) -1)
+ if (chip->irq_base == NO_IRQ)
return 0;
writeb(0, chip->base + GPIOIE); /* disable irqs */
@@ -307,11 +316,13 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
list_add(&chip->list, chip_list);
for (i = 0; i < PL061_GPIO_NR; i++) {
- if (pdata->directions & (1 << i))
- pl061_direction_output(&chip->gc, i,
- pdata->values & (1 << i));
- else
- pl061_direction_input(&chip->gc, i);
+ if (pdata) {
+ if (pdata->directions & (1 << i))
+ pl061_direction_output(&chip->gc, i,
+ pdata->values & (1 << i));
+ else
+ pl061_direction_input(&chip->gc, i);
+ }
irq_set_chip_and_handler(i + chip->irq_base, &pl061_irqchip,
handle_simple_irq);
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