ARM: dt: tegra: seaboard: instantiate pinctrl-based I2C bus mux

Tegra's I2C2 controller can be routed to either the PTA or DDC pin group
on Seaboard. Define the pinctrl state nodes required to allow runtime
control of this routing. Instantiate a pinctrl-i2cmux I2C bus mux that
uses these pinctrl states.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --git a/arch/arm/boot/dts/tegra20-seaboard.dts b/arch/arm/boot/dts/tegra20-seaboard.dts
index b797901..1e1939f 100644 (file)
--- a/arch/arm/boot/dts/tegra20-seaboard.dts
+++ b/arch/arm/boot/dts/tegra20-seaboard.dts
@@ -64,11 +64,6 @@
                                nvidia,pins = "dap4";
                                nvidia,function = "dap4";
                        };
-                       ddc {
-                               nvidia,pins = "ddc", "owc", "spdi", "spdo",
-                                       "uac";
-                               nvidia,function = "rsvd2";
-                       };
                        dta {
                                nvidia,pins = "dta", "dtb", "dtc", "dtd", "dte";
                                nvidia,function = "vi";
@@ -129,14 +124,14 @@
                                        "lspi", "lvp1", "lvs";
                                nvidia,function = "displaya";
                        };
+                       owc {
+                               nvidia,pins = "owc", "spdi", "spdo", "uac";
+                               nvidia,function = "rsvd2";
+                       };
                        pmc {
                                nvidia,pins = "pmc";
                                nvidia,function = "pwr_on";
                        };
-                       pta {
-                               nvidia,pins = "pta";
-                               nvidia,function = "i2c2";
-                       };
                        rm {
                                nvidia,pins = "rm";
                                nvidia,function = "i2c1";
@@ -176,7 +171,7 @@
                        conf_ata {
                                nvidia,pins = "ata", "atb", "atc", "atd",
                                        "cdev1", "cdev2", "dap1", "dap2",
-                                       "dap4", "dtf", "gma", "gmc", "gmd",
+                                       "dap4", "ddc", "dtf", "gma", "gmc", "gmd",
                                        "gme", "gpu", "gpu7", "i2cp", "irrx",
                                        "irtx", "pta", "rm", "sdc", "sdd",
                                        "slxd", "slxk", "spdi", "spdo", "uac",
@@ -185,7 +180,7 @@
                                nvidia,tristate = <0>;
                        };
                        conf_ate {
-                               nvidia,pins = "ate", "csus", "dap3", "ddc",
+                               nvidia,pins = "ate", "csus", "dap3",
                                        "gpv", "owc", "slxc", "spib", "spid",
                                        "spie";
                                nvidia,pull = <0>;
@@ -255,6 +250,39 @@
                                nvidia,slew-rate-falling = <3>;
                        };
                };
+
+               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 {
@@ -312,6 +340,31 @@
                };
        };
 
+       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@7000c500 {
                status = "okay";
                clock-frequency = <400000>;