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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2013-09-21 20:39:49 +0200
committerLinus Walleij <linus.walleij@linaro.org>2013-09-23 20:00:01 +0200
commit63f57cd45b0811de9663edf4af6b170c5bd3860d (patch)
treeadcbd83936fe6a128d778fdc76b8022004e55f10 /drivers/gpio/gpio-pcf857x.c
parente5304db8d7541c1338a6313ae951355b5a72cd19 (diff)
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gpio: pcf857x: Add OF support
Add DT bindings for the pcf857x-compatible chips and parse the device tree node in the driver. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pcf857x.c')
-rw-r--r--drivers/gpio/gpio-pcf857x.c44
1 files changed, 36 insertions, 8 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 54725a632660..1535686e74ea 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -26,6 +26,8 @@
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -49,6 +51,27 @@ static const struct i2c_device_id pcf857x_id[] = {
};
MODULE_DEVICE_TABLE(i2c, pcf857x_id);
+#ifdef CONFIG_OF
+static const struct of_device_id pcf857x_of_table[] = {
+ { .compatible = "nxp,pcf8574" },
+ { .compatible = "nxp,pcf8574a" },
+ { .compatible = "nxp,pca8574" },
+ { .compatible = "nxp,pca9670" },
+ { .compatible = "nxp,pca9672" },
+ { .compatible = "nxp,pca9674" },
+ { .compatible = "nxp,pcf8575" },
+ { .compatible = "nxp,pca8575" },
+ { .compatible = "nxp,pca9671" },
+ { .compatible = "nxp,pca9673" },
+ { .compatible = "nxp,pca9675" },
+ { .compatible = "maxim,max7328" },
+ { .compatible = "maxim,max7329" },
+ { .compatible = "ti,tca9554" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pcf857x_of_table);
+#endif
+
/*
* The pcf857x, pca857x, and pca967x chips only expose one read and one
* write register. Writing a "one" bit (to match the reset state) lets
@@ -260,14 +283,18 @@ fail:
static int pcf857x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct pcf857x_platform_data *pdata;
+ struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct device_node *np = client->dev.of_node;
struct pcf857x *gpio;
+ unsigned int n_latch = 0;
int status;
- pdata = dev_get_platdata(&client->dev);
- if (!pdata) {
+ if (IS_ENABLED(CONFIG_OF) && np)
+ of_property_read_u32(np, "lines-initial-states", &n_latch);
+ else if (pdata)
+ n_latch = pdata->n_latch;
+ else
dev_dbg(&client->dev, "no platform data\n");
- }
/* Allocate, initialize, and register this gpio_chip. */
gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
@@ -360,11 +387,11 @@ static int pcf857x_probe(struct i2c_client *client,
* may cause transient glitching since it can't know the last value
* written (some pins may need to be driven low).
*
- * Using pdata->n_latch avoids that trouble. When left initialized
- * to zero, our software copy of the "latch" then matches the chip's
- * all-ones reset state. Otherwise it flags pins to be driven low.
+ * Using n_latch avoids that trouble. When left initialized to zero,
+ * our software copy of the "latch" then matches the chip's all-ones
+ * reset state. Otherwise it flags pins to be driven low.
*/
- gpio->out = pdata ? ~pdata->n_latch : ~0;
+ gpio->out = ~n_latch;
gpio->status = gpio->out;
status = gpiochip_add(&gpio->chip);
@@ -426,6 +453,7 @@ static struct i2c_driver pcf857x_driver = {
.driver = {
.name = "pcf857x",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pcf857x_of_table),
},
.probe = pcf857x_probe,
.remove = pcf857x_remove,