i2c: efm32: new bus driver

This was tested on a EFM32GG-DK3750 devboard that has a temperature
sensor and an eeprom on its i2c bus.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 34 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-efm32.txt b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt
new file mode 100644
index 000000000000..ead4dd33ab66
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt
@@ -0,0 +1,34 @@
+* Energymicro efm32 i2c controller
+
+Required properties :
+
+ - reg : Offset and length of the register set for the device
+ - compatible : should be "efm32,i2c"
+ - interrupts : the interrupt number
+ - clocks : reference to the module clock
+
+Recommended properties :
+
+ - clock-frequency : maximal I2C bus clock frequency in Hz.
+ - efm32,location : Decides the location of the USART I/O pins.
+   Allowed range : [0 .. 6]
+
+Example:
+        i2c0: i2c@4000a000 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                compatible = "efm32,i2c";
+                reg = <0x4000a000 0x400>;
+                interrupts = <9>;
+                clocks = <&cmu clk_HFPERCLKI2C0>;
+                clock-frequency = <100000>;
+                status = "disabled";
+                efm32,location = <3>;
+
+                eeprom@50 {
+                        compatible = "microchip,24c02";
+                        reg = <0x50>;
+                        pagesize = <16>;
+                };
+        };
+