regulator: tps65090: dts: Add binding documentation

The binding is fairly simple but we should still have documentation for it.

BUG=chrome-os-partner:10617
TEST=build and boot to kernel prompt on daisy

Change-Id: I817d6934e38a963c24334c9512a8fbe8daea077a
Signed-off-by: Simon Glass <sjg@chromium.org>
BUG=chrome-os-partner:10617
TEST=build and boot to kernel prompt on snow
Reviewed-on: https://gerrit.chromium.org/gerrit/40165
Reviewed-by: Sameer Nanda <snanda@chromium.org>

diff --git a/Documentation/devicetree/bindings/regulator/tps65090-regulator.txt b/Documentation/devicetree/bindings/regulator/tps65090-regulator.txt
new file mode 100644 (file)
index 0000000..ed2aa62
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/tps65090-regulator.txt
@@ -0,0 +1,69 @@
+TI TPS65090 Regulator
+=====================
+
+Regulator information exists as a subnode within the mfd node for the main
+TPS65090 device.
+
+The TPS65090 regulator subnode should be called "voltage-regulators" and
+in turn has one subnode for each regulator (generally just a FET).
+
+The required properties for the individual regulator nodes are as for
+regulator.txt, with the following additions / changes:
+
+Required properties :
+ - tps65090-control-reg-offset : Register offset that controls this
+       regulator.
+
+Example:
+
+power-regulator {
+       compatible = "ti,tps65090";
+       reg = <0x48>;
+
+       voltage-regulators {
+               VFET1 {
+                       tps65090-control-reg-offset = <15>;
+                       regulator-name = "vcd_led";
+                       regulator-min-microvolt = <12000000>;
+                       regulator-max-microvolt = <12000000>;
+               };
+               VFET2 {
+                       tps65090-control-reg-offset = <16>;
+                       regulator-name = "video_mid";
+                       regulator-min-microvolt = <5000000>;
+                       regulator-max-microvolt = <5000000>;
+               };
+               VFET3 {
+                       tps65090-control-reg-offset = <17>;
+                       regulator-name = "wwan_r";
+                       regulator-min-microvolt = <3300000>;
+                       regulator-max-microvolt = <3300000>;
+                       regulator-always-on;
+               };
+               VFET4 {
+                       tps65090-control-reg-offset = <18>;
+                       regulator-name = "sdcard";
+                       regulator-min-microvolt = <3300000>;
+                       regulator-max-microvolt = <3300000>;
+               };
+               VFET5 {
+                       tps65090-control-reg-offset = <19>;
+                       regulator-name = "camout";
+                       regulator-min-microvolt = <3300000>;
+                       regulator-max-microvolt = <3300000>;
+                       regulator-always-on;
+               };
+               VFET6 {
+                       tps65090-control-reg-offset = <20>;
+                       regulator-name = "lcd_vdd";
+                       regulator-min-microvolt = <3300000>;
+                       regulator-max-microvolt = <3300000>;
+               };
+               VFET7 {
+                       tps65090-control-reg-offset = <21>;
+                       regulator-name = "ts";
+                       regulator-min-microvolt = <5000000>;
+                       regulator-max-microvolt = <5000000>;
+               };
+       };
+};