dt-bindings: mfd: update TI tps6105x chip bindings

The driver has been extended to optionally get its operational
mode, regulator init data and LED naming from the devicetree.

Acked-by: Jacek Anaszewski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Sven Van Asbroeck <[e-mail]>
Signed-off-by: Pavel Machek <[e-mail]>

Documentation/devicetree/bindings/mfd/tps6105x.txt

···
 - compatible:		"ti,tps61050" or "ti,tps61052"
 - reg:			Specifies the I2C slave address
 
-Example:
+Optional sub-node:
+
+This subnode selects the chip's operational mode.
+There can be at most one single available subnode.
+
+- regulator: presence of this sub-node puts the chip in regulator mode.
+	see ../regulator/regulator.yaml
+
+- led: presence of this sub-node puts the chip in led mode.
+	Optional properties:
+	- function : see ../leds/common.txt
+	- color    : see ../leds/common.txt
+	- label    : see ../leds/common.txt
+			(deprecated)
+
+Example (GPIO operation only):
 
 i2c0 {
 	tps61052@33 {
 		compatible = "ti,tps61052";
 		reg = <0x33>;
+	};
+};
+
+Example (GPIO + regulator operation):
+
+i2c0 {
+	tps61052@33 {
+		compatible = "ti,tps61052";
+		reg = <0x33>;
+
+		regulator {
+			regulator-min-microvolt = <5000000>;
+			regulator-max-microvolt = <5000000>;
+			regulator-always-on;
+		};
+	};
+};
+
+Example (GPIO + led operation):
+
+#include <dt-bindings/leds/common.h>
+
+i2c0 {
+	tps61052@33 {
+		compatible = "ti,tps61052";
+		reg = <0x33>;
+
+		led {
+			color = <LED_COLOR_ID_WHITE>;
+		};
 	};
 };