USB: misc: usb3503: add dt support

Added device tree support for usb3503 driver and add new document with device tree binding information.

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/usb3503.txt b/Documentation/devicetree/bindings/usb/usb3503.txt
new file mode 100644 (file)
index 0000000..6813a71
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb3503.txt
@@ -0,0 +1,20 @@
+SMSC USB3503 High-Speed Hub Controller
+
+Required properties:
+- compatible: Should be "smsc,usb3503".
+- reg: Specifies the i2c slave address, it should be 0x08.
+- connect-gpios: Should specify GPIO for connect.
+- intn-gpios: Should specify GPIO for interrupt.
+- reset-gpios: Should specify GPIO for reset.
+- initial-mode: Should specify initial mode.
+                (1 for HUB mode, 2 for STANDBY mode)
+
+Examples:
+       usb3503@08 {
+               compatible = "smsc,usb3503";
+               reg = <0x08>;
+               connect-gpios = <&gpx3 0 1>;
+               intn-gpios = <&gpx3 4 1>;
+               reset-gpios = <&gpx3 5 1>;
+               initial-mode = <1>;
+       };

diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index dc2c993..471218a 100644 (file)
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -23,6 +23,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/usb3503.h>
 
@@ -181,8 +182,10 @@ err_hubmode:
 static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 {
        struct usb3503_platform_data *pdata = i2c->dev.platform_data;
+       struct device_node *np = i2c->dev.of_node;
        struct usb3503 *hub;
        int err = -ENOMEM;
+       u32 mode;
 
        hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
        if (!hub) {
@@ -193,14 +196,23 @@ static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
        i2c_set_clientdata(i2c, hub);
        hub->client = i2c;
 
-       if (!pdata) {
-               dev_dbg(&i2c->dev, "missing platform data\n");
-               goto err_out;
-       } else {
+       if (pdata) {
                hub->gpio_intn          = pdata->gpio_intn;
                hub->gpio_connect       = pdata->gpio_connect;
                hub->gpio_reset         = pdata->gpio_reset;
                hub->mode               = pdata->initial_mode;
+       } else if (np) {
+               hub->gpio_intn  = of_get_named_gpio(np, "connect-gpios", 0);
+               if (hub->gpio_intn == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+               hub->gpio_connect = of_get_named_gpio(np, "intn-gpios", 0);
+               if (hub->gpio_connect == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+               hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
+               if (hub->gpio_reset == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+               of_property_read_u32(np, "initial-mode", &mode);
+               hub->mode = mode;
        }
 
        if (gpio_is_valid(hub->gpio_intn)) {
@@ -236,7 +248,7 @@ static int usb3503_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
                }
        }
 
-       usb3503_switch_mode(hub, pdata->initial_mode);
+       usb3503_switch_mode(hub, hub->mode);
 
        dev_info(&i2c->dev, "%s: probed on  %s mode\n", __func__,
                        (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
@@ -277,9 +289,18 @@ static const struct i2c_device_id usb3503_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, usb3503_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id usb3503_of_match[] = {
+       { .compatible = "smsc,usb3503", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, usb3503_of_match);
+#endif
+
 static struct i2c_driver usb3503_driver = {
        .driver = {
                .name = USB3503_I2C_NAME,
+               .of_match_table = of_match_ptr(usb3503_of_match),
        },
        .probe          = usb3503_probe,
        .remove         = usb3503_remove,