diff options
| author | KV Sujith <sujithkv@ti.com> | 2013-11-21 22:15:29 +0400 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2013-12-25 22:32:11 +0400 |
| commit | c770844c3e30bed3c269efff1bbb9a14c2318e39 (patch) | |
| tree | e7bbeef5c10b5cce2673c77a5197de95653d3e36 /drivers/gpio | |
| parent | d3422a18dbc4a8aa1d430828b39e48d6c91f1791 (diff) | |
| download | linux-c770844c3e30bed3c269efff1bbb9a14c2318e39.tar.xz | |
gpio: davinci: add OF support
This patch adds OF parser support for davinci gpio
driver and also appropriate documentation in gpio-davinci.txt
located at Documentation/devicetree/bindings/gpio/.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: KV Sujith <sujithkv@ti.com>
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
[prabhakar.csengg@gmail.com: simplified the OF code, removed
unnecessary DT property and also simplified
the commit message]
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-davinci.c | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 92d9922cfcc7..37cf95254df1 100644 --- a/drivers/gpio/gpio-davinci.c +++ b/drivers/gpio/gpio-davinci.c @@ -17,6 +17,9 @@ #include <linux/io.h> #include <linux/irq.h> #include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/platform_data/gpio-davinci.h> @@ -134,6 +137,40 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value) writel_relaxed((1 << offset), value ? &g->set_data : &g->clr_data); } +static struct davinci_gpio_platform_data * +davinci_gpio_get_pdata(struct platform_device *pdev) +{ + struct device_node *dn = pdev->dev.of_node; + struct davinci_gpio_platform_data *pdata; + int ret; + u32 val; + + if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node) + return pdev->dev.platform_data; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + ret = of_property_read_u32(dn, "ti,ngpio", &val); + if (ret) + goto of_err; + + pdata->ngpio = val; + + ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val); + if (ret) + goto of_err; + + pdata->gpio_unbanked = val; + + return pdata; + +of_err: + dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret); + return NULL; +} + static int davinci_gpio_probe(struct platform_device *pdev) { int i, base; @@ -144,12 +181,14 @@ static int davinci_gpio_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct resource *res; - pdata = dev->platform_data; + pdata = davinci_gpio_get_pdata(pdev); if (!pdata) { dev_err(dev, "No platform data found\n"); return -EINVAL; } + dev->platform_data = pdata; + /* * The gpio banks conceptually expose a segmented bitmap, * and "ngpio" is one more than the largest zero-based @@ -195,6 +234,9 @@ static int davinci_gpio_probe(struct platform_device *pdev) if (chips[i].chip.ngpio > 32) chips[i].chip.ngpio = 32; +#ifdef CONFIG_OF_GPIO + chips[i].chip.of_node = dev->of_node; +#endif spin_lock_init(&chips[i].lock); regs = gpio2regs(base); @@ -506,11 +548,20 @@ done: return 0; } +#if IS_ENABLED(CONFIG_OF) +static const struct of_device_id davinci_gpio_ids[] = { + { .compatible = "ti,dm6441-gpio", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, davinci_gpio_ids); +#endif + static struct platform_driver davinci_gpio_driver = { .probe = davinci_gpio_probe, .driver = { - .name = "davinci_gpio", - .owner = THIS_MODULE, + .name = "davinci_gpio", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(davinci_gpio_ids), }, }; |