ARM: bcm2835: add I2C controllers to DT

The BCM2835 has 3 identical I2C controllers. Instantiate them all in the
SoC .dtsi file, and enable the relevant two in the Raspberry Pi board
.dts file.

Note that on the Raspberry Pi Model B revision 1, I2C0 is connected to
the general-purpose expansion header, and I2C1 is connected to the camera
connector. Revision 2 of the board swaps these assignments:-(

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

2 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index 0544ef860623..aafda174a605 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts
@@ -25,6 +25,16 @@
         };
 };
 
+&i2c0 {
+        status = "okay";
+        clock-frequency = <100000>;
+};
+
+&i2c1 {
+        status = "okay";
+        clock-frequency = <100000>;
+};
+
 &sdhci {
         status = "okay";
         bus-width = <4>;
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 1d7e4f5c0b1e..c69a591631b8 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -64,6 +64,22 @@
                         #interrupt-cells = <2>;
                 };
 
+                i2c0: i2c@20205000 {
+                        compatible = "brcm,bcm2835-i2c";
+                        reg = <0x7e205000 0x1000>;
+                        interrupts = <2 21>;
+                        clocks = <&clk_i2c>;
+                        status = "disabled";
+                };
+
+                i2c1: i2c@20804000 {
+                        compatible = "brcm,bcm2835-i2c";
+                        reg = <0x7e804000 0x1000>;
+                        interrupts = <2 21>;
+                        clocks = <&clk_i2c>;
+                        status = "disabled";
+                };
+
                 sdhci: sdhci {
                         compatible = "brcm,bcm2835-sdhci";
                         reg = <0x7e300000 0x100>;
@@ -73,6 +89,12 @@
                 };
         };
 
+        clk_i2c: clock {
+                compatible = "fixed-clock";
+                #clock-cells = <0>;
+                clock-frequency = <150000000>;
+        };
+
         clk_mmc: clock {
                 compatible = "fixed-clock";
                 #clock-cells = <0>;