ARM: tegra: tamonten: Add DDC/PTA pinmux

This commit allows the I2C2 controller on Tegra20 to be routed either to
the DDC or the PTA pin group at runtime. On Tamonten this allows the I2C
bus to be used for the DDC of the HDMI connector or to access I2C chips
on the carrier board.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --git a/arch/arm/boot/dts/tegra20-tamonten.dtsi b/arch/arm/boot/dts/tegra20-tamonten.dtsi
index 5b3d8b1..c3540e0 100644 (file)
--- a/arch/arm/boot/dts/tegra20-tamonten.dtsi
+++ b/arch/arm/boot/dts/tegra20-tamonten.dtsi
@@ -62,10 +62,6 @@
                                nvidia,pins = "dap4";
                                nvidia,function = "dap4";
                        };
-                       ddc {
-                               nvidia,pins = "ddc";
-                               nvidia,function = "i2c2";
-                       };
                        dta {
                                nvidia,pins = "dta", "dtd";
                                nvidia,function = "sdio2";
@@ -91,7 +87,7 @@
                                nvidia,function = "pcie";
                        };
                        hdint {
-                               nvidia,pins = "hdint", "pta";
+                               nvidia,pins = "hdint";
                                nvidia,function = "hdmi";
                        };
                        i2cp {
@@ -230,6 +226,39 @@
                                nvidia,pull = <1>;
                        };
                };
+
+               state_i2cmux_ddc: pinmux_i2cmux_ddc {
+                       ddc {
+                               nvidia,pins = "ddc";
+                               nvidia,function = "i2c2";
+                       };
+                       pta {
+                               nvidia,pins = "pta";
+                               nvidia,function = "rsvd4";
+                       };
+               };
+
+               state_i2cmux_pta: pinmux_i2cmux_pta {
+                       ddc {
+                               nvidia,pins = "ddc";
+                               nvidia,function = "rsvd4";
+                       };
+                       pta {
+                               nvidia,pins = "pta";
+                               nvidia,function = "i2c2";
+                       };
+               };
+
+               state_i2cmux_idle: pinmux_i2cmux_idle {
+                       ddc {
+                               nvidia,pins = "ddc";
+                               nvidia,function = "rsvd4";
+                       };
+                       pta {
+                               nvidia,pins = "pta";
+                               nvidia,function = "rsvd4";
+                       };
+               };
        };
 
        i2s@70002800 {
@@ -246,6 +275,36 @@
                status = "okay";
        };
 
+       i2c@7000c400 {
+               clock-frequency = <100000>;
+               status = "okay";
+       };
+
+       i2cmux {
+               compatible = "i2c-mux-pinctrl";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               i2c-parent = <&{/i2c@7000c400}>;
+
+               pinctrl-names = "ddc", "pta", "idle";
+               pinctrl-0 = <&state_i2cmux_ddc>;
+               pinctrl-1 = <&state_i2cmux_pta>;
+               pinctrl-2 = <&state_i2cmux_idle>;
+
+               i2c@0 {
+                       reg = <0>;
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+               };
+
+               i2c@1 {
+                       reg = <1>;
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+               };
+       };
+
        i2c@7000d000 {
                clock-frequency = <400000>;
                status = "okay";