dt-bindings: power: supply: Add docs for TI BQ24190 battery charger

Document monitored-battery and ti,system-minimum-microvolt properties.

Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Liam Breck <kernel@networkimprov.net>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

diff --git a/Documentation/devicetree/bindings/power/supply/bq24190.txt b/Documentation/devicetree/bindings/power/supply/bq24190.txt
new file mode 100644 (file)
index 0000000..9e517d3
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+TI BQ24190 Li-Ion Battery Charger
+
+Required properties:
+- compatible: contains one of the following:
+    * "ti,bq24190"
+    * "ti,bq24192i"
+- reg: integer, I2C address of the charger.
+- interrupts[-extended]: configuration for charger INT pin.
+
+Optional properties:
+- monitored-battery: phandle of battery characteristics devicetree node
+  The charger uses the following battery properties:
+    + precharge-current-microamp: maximum charge current during precharge
+      phase (typically 20% of battery capacity).
+    + charge-term-current-microamp: a charge cycle terminates when the
+      battery voltage is above recharge threshold, and the current is below
+      this setting (typically 10% of battery capacity).
+  See also Documentation/devicetree/bindings/power/supply/battery.txt
+- ti,system-minimum-microvolt: when power is connected and the battery is below
+  minimum system voltage, the system will be regulated above this setting.
+
+Notes:
+- Some circuit boards wire the chip's "OTG" pin high (enabling 500mA default
+  charge current on USB SDP ports, among other features). To simulate this on
+  boards that wire the pin to a GPIO, set a gpio-hog.
+
+Example:
+
+       bat: battery {
+               compatible = "simple-battery";
+               precharge-current-microamp = <256000>;
+               charge-term-current-microamp = <128000>;
+               // etc.
+       };
+
+       bq24190: charger@6a {
+               compatible = "ti,bq24190";
+               reg = <0x6a>;
+               interrupts-extended = <&gpiochip 10 IRQ_TYPE_EDGE_FALLING>;
+               monitored-battery = <&bat>;
+               ti,system-minimum-microvolt = <3200000>;
+       };
+
+       &twl_gpio {
+               otg {
+                       gpio-hog;
+                       gpios = <6 0>;
+                       output-high;
+                       line-name = "otg-gpio";
+               };
+       };