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gpio-rcar: Add DT support

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Add DT bindings for the gpio-rcar driver and read the device
configuration from the DT node at probe time if available.

Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Laurent Pinchart
2013-05-21 13:40:06 +02:00
committed by Simon Horman
parent 5fcf4a3c3a
commit 159f8a0209
2 changed files with 108 additions and 10 deletions
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66
drivers/gpio/gpio-rcar.c
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@@ -51,6 +51,8 @@ struct gpio_rcar_priv {
#define FILONOFF 0x28
#define BOTHEDGE 0x4c
#define RCAR_MAX_GPIO_PER_BANK 32
static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
{
return ioread32(p->base + offs);
@@ -274,9 +276,39 @@ static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
.map = gpio_rcar_irq_domain_map,
};
static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
{
struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
#ifdef CONFIG_OF
struct device_node *np = p->pdev->dev.of_node;
struct of_phandle_args args;
int ret;
#endif
if (pdata)
p->config = *pdata;
#ifdef CONFIG_OF
else if (np) {
ret = of_parse_phandle_with_args(np, "gpio-ranges",
"#gpio-range-cells", 0, &args);
p->config.number_of_pins = ret == 0 && args.args_count == 3
? args.args[2]
: RCAR_MAX_GPIO_PER_BANK;
p->config.gpio_base = -1;
}
#endif
if (p->config.number_of_pins == 0 ||
p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
dev_warn(&p->pdev->dev,
"Invalid number of gpio lines %u, using %u\n",
p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
}
}
static int gpio_rcar_probe(struct platform_device *pdev)
{
struct gpio_rcar_config *pdata = pdev->dev.platform_data;
struct gpio_rcar_priv *p;
struct resource *io, *irq;
struct gpio_chip *gpio_chip;
@@ -291,14 +323,14 @@ static int gpio_rcar_probe(struct platform_device *pdev)
goto err0;
}
/* deal with driver instance configuration */
if (pdata)
p->config = *pdata;
p->pdev = pdev;
platform_set_drvdata(pdev, p);
spin_lock_init(&p->lock);
/* Get device configuration from DT node or platform data. */
gpio_rcar_parse_pdata(p);
platform_set_drvdata(pdev, p);
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -325,6 +357,7 @@ static int gpio_rcar_probe(struct platform_device *pdev)
gpio_chip->set = gpio_rcar_set;
gpio_chip->to_irq = gpio_rcar_to_irq;
gpio_chip->label = name;
gpio_chip->dev = &pdev->dev;
gpio_chip->owner = THIS_MODULE;
gpio_chip->base = p->config.gpio_base;
gpio_chip->ngpio = p->config.number_of_pins;
@@ -371,10 +404,12 @@ static int gpio_rcar_probe(struct platform_device *pdev)
p->config.irq_base, ret);
}
ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
gpio_chip->base, gpio_chip->ngpio);
if (ret < 0)
dev_warn(&pdev->dev, "failed to add pin range\n");
if (p->config.pctl_name) {
ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
gpio_chip->base, gpio_chip->ngpio);
if (ret < 0)
dev_warn(&pdev->dev, "failed to add pin range\n");
}
return 0;
@@ -397,11 +432,22 @@ static int gpio_rcar_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id gpio_rcar_of_table[] = {
{
.compatible = "renesas,gpio-rcar",
},
};
MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
#endif
static struct platform_driver gpio_rcar_device_driver = {
.probe = gpio_rcar_probe,
.remove = gpio_rcar_remove,
.driver = {
.name = "gpio_rcar",
.of_match_table = of_match_ptr(gpio_rcar_of_table),
}
};