From 159f8a0209aff155af7f6fcdedd4a4484dd19c23 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 21 May 2013 13:40:06 +0200 Subject: gpio-rcar: Add DT support 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 Signed-off-by: Simon Horman --- drivers/gpio/gpio-rcar.c | 66 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 56 insertions(+), 10 deletions(-) (limited to 'drivers/gpio/gpio-rcar.c') diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index d173d56dbb8c..5a693dd0ac7a 100644 --- a/drivers/gpio/gpio-rcar.c +++ b/drivers/gpio/gpio-rcar.c @@ -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), } }; -- cgit v1.2.3