diff options
| author | Lee Jones <lee.jones@linaro.org> | 2012-09-07 15:14:59 +0400 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-09-13 01:15:46 +0400 |
| commit | 3113e679021a3a6bace1c62a8432cc0ec27c09ab (patch) | |
| tree | 4577064b83b9c7da36bc64f35e76b58107658b2d | |
| parent | efe4c9496a80253492942624dd23caa3ca6782c8 (diff) | |
| download | linux-3113e679021a3a6bace1c62a8432cc0ec27c09ab.tar.xz | |
gpio: Enable the tc3298x GPIO expander driver for Device Tree
Here we provide a means to probe and extract vital information
from Device Tree when booting with it enabled. Without this
patch sub-devices wouldn't be able to reference the tc3589x-gpio
expander from Device Tree.
CC: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-tc3589x.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c index 6e8900933972..1e48317e70fb 100644 --- a/drivers/gpio/gpio-tc3589x.c +++ b/drivers/gpio/gpio-tc3589x.c @@ -11,6 +11,7 @@ #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/gpio.h> +#include <linux/of.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/interrupt.h> @@ -286,7 +287,8 @@ static struct irq_domain_ops tc3589x_irq_ops = { .xlate = irq_domain_xlate_twocell, }; -static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio) +static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio, + struct device_node *np) { int base = tc3589x_gpio->irq_base; @@ -297,7 +299,7 @@ static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio) } else { tc3589x_gpio->domain = irq_domain_add_linear( - NULL, tc3589x_gpio->chip.ngpio, + np, tc3589x_gpio->chip.ngpio, &tc3589x_irq_ops, tc3589x_gpio); } @@ -313,13 +315,17 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev) { struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent); struct tc3589x_gpio_platform_data *pdata; + struct device_node *np = pdev->dev.of_node; struct tc3589x_gpio *tc3589x_gpio; int ret; int irq; pdata = tc3589x->pdata->gpio; - if (!pdata) - return -ENODEV; + + if (!(pdata || np)) { + dev_err(&pdev->dev, "No platform data or Device Tree found\n"); + return -EINVAL; + } irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -337,9 +343,11 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev) tc3589x_gpio->chip = template_chip; tc3589x_gpio->chip.ngpio = tc3589x->num_gpio; tc3589x_gpio->chip.dev = &pdev->dev; - tc3589x_gpio->chip.base = pdata->gpio_base; + tc3589x_gpio->chip.base = (pdata) ? pdata->gpio_base : -1; - tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0); +#ifdef CONFIG_OF_GPIO + tc3589x_gpio->chip.of_node = np; +#endif tc3589x_gpio->irq_base = tc3589x->irq_base ? tc3589x->irq_base + TC3589x_INT_GPIO(0) : 0; @@ -350,7 +358,7 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev) if (ret < 0) goto out_free; - ret = tc3589x_gpio_irq_init(tc3589x_gpio); + ret = tc3589x_gpio_irq_init(tc3589x_gpio, np); if (ret) goto out_free; @@ -367,7 +375,7 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev) goto out_freeirq; } - if (pdata->setup) + if (pdata && pdata->setup) pdata->setup(tc3589x, tc3589x_gpio->chip.base); platform_set_drvdata(pdev, tc3589x_gpio); @@ -389,7 +397,7 @@ static int __devexit tc3589x_gpio_remove(struct platform_device *pdev) int irq = platform_get_irq(pdev, 0); int ret; - if (pdata->remove) + if (pdata && pdata->remove) pdata->remove(tc3589x, tc3589x_gpio->chip.base); ret = gpiochip_remove(&tc3589x_gpio->chip); |