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Commit e4bfb0ff authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: ixp4xx: Add OF probing support 



This adds device tree probe and registration support for
the IXP4xx GPIO driver.

Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent e8e2f565

drivers/gpio/gpio-ixp4xx.c

+57 −27
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/irqchip.h>

#include <linux/of_irq.h>

#include <linux/platform_device.h>

#include <linux/bitops.h>

/* Include that go away with DT transition */
@@ -306,6 +307,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev) 
{

	unsigned long flags;

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct irq_domain *parent;

	struct resource *res;

	struct ixp4xx_gpio *g;
@@ -382,12 +384,28 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev) 
	 * from IRQCHIP_DECLARE(), then use of_node_to_fwnode() to get

	 * the fwnode. For now we need this boardfile style code.

	 */

	if (np) {

		struct device_node *irq_parent;



		irq_parent = of_irq_find_parent(np);

		if (!irq_parent) {

			dev_err(dev, "no IRQ parent node\n");

			return -ENODEV;

		}

		parent = irq_find_host(irq_parent);

		if (!parent) {

			dev_err(dev, "no IRQ parent domain\n");

			return -ENODEV;

		}

		g->fwnode = of_node_to_fwnode(np);

	} else {

		parent = ixp4xx_get_irq_domain();

		g->fwnode = irq_domain_alloc_fwnode(g->base);

		if (!g->fwnode) {

			dev_err(dev, "no domain base\n");

			return -ENODEV;

		}

	}

	g->domain = irq_domain_create_hierarchy(parent,

						IRQ_DOMAIN_FLAG_HIERARCHY,

						ARRAY_SIZE(ixp4xx_gpiomap),
@@ -404,6 +422,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev) 
	 * After adding OF support, this is no longer needed: irqs

	 * will be allocated for the respective fwnodes.

	 */

	if (!np) {

		for (i = 0; i < ARRAY_SIZE(ixp4xx_gpiomap); i++) {

			const struct ixp4xx_gpio_map *map = &ixp4xx_gpiomap[i];

			struct irq_fwspec fwspec;
@@ -424,10 +443,12 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev) 
				irq_domain_free_fwnode(g->fwnode);

				dev_err(dev,

					"can not allocate irq for GPIO line %d parent hwirq %d in hierarchy domain: %d\n",

				map->gpio_offset, map->parent_hwirq, ret);

					map->gpio_offset, map->parent_hwirq,

					ret);

				return ret;

			}

		}

	}



	platform_set_drvdata(pdev, g);

	dev_info(dev, "IXP4 GPIO @%p registered\n", g->base);
@@ -435,9 +456,18 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev) 
	return 0;

}



static const struct of_device_id ixp4xx_gpio_of_match[] = {

	{

		.compatible = "intel,ixp4xx-gpio",

	},

	{},

};





static struct platform_driver ixp4xx_gpio_driver = {

	.driver = {

		.name		= "ixp4xx-gpio",

		.of_match_table = of_match_ptr(ixp4xx_gpio_of_match),

	},

	.probe = ixp4xx_gpio_probe,

};