i2c/gpio: add DT support

To achieve DT support, we need to populate a custom platform_data in a
private struct from DT information. To simplify code, the adapter and
algorithm are also put into the private struct.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio_i2c.txt b/Documentation/devicetree/bindings/gpio/gpio_i2c.txt
new file mode 100644
index 000000000000..4f8ec947c6bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio_i2c.txt
@@ -0,0 +1,32 @@
+Device-Tree bindings for i2c gpio driver
+
+Required properties:
+        - compatible = "i2c-gpio";
+        - gpios: sda and scl gpio
+
+
+Optional properties:
+        - i2c-gpio,sda-open-drain: sda as open drain
+        - i2c-gpio,scl-open-drain: scl as open drain
+        - i2c-gpio,scl-output-only: scl as output only
+        - i2c-gpio,delay-us: delay between GPIO operations (may depend on each platform)
+        - i2c-gpio,timeout-ms: timeout to get data
+
+Example nodes:
+
+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>;
+        };
+};