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gpio: davinci: add OF support

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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>
This commit is contained in:
KV Sujith
2013-11-21 23:45:29 +05:30
committed by Sekhar Nori
parent d3422a18db
commit c770844c3e
2 changed files with 95 additions and 3 deletions
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57
drivers/gpio/gpio-davinci.c
View File

@@ -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),
},
};