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authorDaniel Mack <zonque@gmail.com>2012-07-23 16:36:35 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-16 10:00:23 -0700
commit5f3d1382e3ca39a54032784414f0ad4e7078b37e (patch)
tree7d1efb0ca10940719547e04d2f82074568e0da51 /drivers/w1
parent73f2989d37a36614fe13f24891ebe1e44fe5887d (diff)
downloadlinux-5f3d1382e3ca39a54032784414f0ad4e7078b37e.tar.gz
onewire: w1-gpio: add DT bindings
This patch add DT bindings to the w1-gpio driver, along with some documentation on how to use them. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Acked-by: Ville Syrjälä <syrjala@sci.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/masters/w1-gpio.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index df600d14974..f01c336233d 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -14,6 +14,8 @@
#include <linux/slab.h>
#include <linux/w1-gpio.h>
#include <linux/gpio.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
#include "../w1.h"
#include "../w1_int.h"
@@ -42,12 +44,55 @@ static u8 w1_gpio_read_bit(void *data)
return gpio_get_value(pdata->pin) ? 1 : 0;
}
+#ifdef CONFIG_OF
+static struct of_device_id w1_gpio_dt_ids[] = {
+ { .compatible = "w1-gpio" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids);
+
+static int w1_gpio_probe_dt(struct platform_device *pdev)
+{
+ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *of_id =
+ of_match_device(w1_gpio_dt_ids, &pdev->dev);
+
+ if (!of_id)
+ return 0;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ if (of_get_property(np, "linux,open-drain", NULL))
+ pdata->is_open_drain = 1;
+
+ pdata->pin = of_get_gpio(np, 0);
+ pdata->ext_pullup_enable_pin = of_get_gpio(np, 1);
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+#else
+static int w1_gpio_probe_dt(struct platform_device *pdev)
+{
+ return 0;
+}
+#endif
+
static int __init w1_gpio_probe(struct platform_device *pdev)
{
struct w1_bus_master *master;
- struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
+ struct w1_gpio_platform_data *pdata;
int err;
+ err = w1_gpio_probe_dt(pdev);
+ if (err < 0)
+ return err;
+
+ pdata = pdev->dev.platform_data;
+
if (!pdata)
return -ENXIO;
@@ -135,6 +180,7 @@ static struct platform_driver w1_gpio_driver = {
.driver = {
.name = "w1-gpio",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(w1_gpio_dt_ids),
},
.remove = __exit_p(w1_gpio_remove),
.suspend = w1_gpio_suspend,