When i2c-gpio node number is greater than 1, the second can not sucessfully
regiter
Using alias method to get the pdev->id, or else the second device will use
the same id which will cause fail to register
Signed-off-by: Bo Shen <voice.shen@xxxxxxxxx>
---
Documentation/devicetree/bindings/i2c/gpio-i2c.txt | 46 +++++++++++++++++++-
drivers/i2c/busses/i2c-gpio.c | 1 +
2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/i2c/gpio-i2c.txt b/Documentation/devicetree/bindings/i2c/gpio-i2c.txt
index 4f8ec94..e76dd00 100644
--- a/Documentation/devicetree/bindings/i2c/gpio-i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/gpio-i2c.txt
@@ -1,4 +1,7 @@
-Device-Tree bindings for i2c gpio driver
+* Device-Tree bindings for i2c gpio driver
+
+Optional alias:
+ - i2c-gpio: used to get id, when more than one i2c-gpio in dts file
Required properties:
- compatible = "i2c-gpio";
@@ -30,3 +33,44 @@ i2c@0 {
reg = <0x56>;
};
};
+
+
+Example nodes with alias:
+
+aliases {
+ i2c-gpio0 = &i2c0;
+ i2c-gpio1 = &i2c1;
+};
+
+i2c0: i2c@0 {
+ compatible = "i2c-gpio";
+ gpios = <&pioA 23 0 /* sda */
+ &pioA 24 0 /* scl */
+ >;
+ i2c-gpio,sda-open-drain;
+ i2c-gpio,scl-open-drain;
+ i2c-gpio,delay-us = <2>; /* ~100 kHz */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ rv3029c2@56 {
+ compatible = "rv3029c2";
+ reg = <0x56>;
+ };
+};
+
+i2c1: i2c@0 {
+ compatible = "i2c-gpio";
+ gpios = <&pioA 30 0 /* sda */
+ &pioA 31 0 /* scl */
+ >;
+ i2c-gpio,sda-open-drain;
+ i2c-gpio,scl-open-drain;
+ i2c-gpio,delay-us = <2>; /* ~100 kHz */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ rv3029c2@56 {
+ compatible = "rv3029c2";
+ reg = <0x56>;
+ };
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index e62d2d9..051fbb3 100644
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -136,6 +136,7 @@ static int __devinit i2c_gpio_probe(struct platform_device *pdev)
ret = of_i2c_gpio_probe(pdev->dev.of_node, pdata);
if (ret)
return ret;
+ pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c-gpio");
} else {
if (!pdev->dev.platform_data)
return -ENXIO;
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
