DT: leds: Add bindings for ISSI is31fl319x

This adds a binding description for ISSI is31fl319x LED controllers.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>

diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
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+LEDs connected to is31fl319x LED controller chip
+
+Required properties:
+- compatible : Should be any of
+       "issi,is31fl3190"
+       "issi,is31fl3191"
+       "issi,is31fl3193"
+       "issi,is31fl3196"
+       "issi,is31fl3199"
+       "si-en,sn3199".
+- #address-cells: Must be 1.
+- #size-cells: Must be 0.
+- reg: 0x64, 0x65, 0x66, or 0x67.
+
+Optional properties:
+- audio-gain-db : audio gain selection for external analog modulation input.
+       Valid values: 0 - 21, step by 3 (rounded down)
+       Default: 0
+
+Each led is represented as a sub-node of the issi,is31fl319x device.
+There can be less leds subnodes than the chip can support but not more.
+
+Required led sub-node properties:
+- reg : number of LED line
+       Valid values: 1 - number of leds supported by the chip variant.
+
+Optional led sub-node properties:
+- label : see Documentation/devicetree/bindings/leds/common.txt.
+- linux,default-trigger :
+       see Documentation/devicetree/bindings/leds/common.txt.
+- led-max-microamp : (optional)
+       Valid values: 5000 - 40000, step by 5000 (rounded down)
+       Default: 20000 (20 mA)
+       Note: a driver will take the lowest of all led limits since the
+       chip has a single global setting. The lowest value will be chosen
+       due to the PWM specificity, where lower brightness is achieved
+       by reducing the dury-cycle of pulses and not the current, which
+       will always have its peak value equal to led-max-microamp.
+
+Examples:
+
+fancy_leds: leds@65 {
+       compatible = "issi,is31fl3196";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       reg = <0x65>;
+
+       red_aux: led@1 {
+               label = "red:aux";
+               reg = <1>;
+               led-max-microamp = <10000>;
+       };
+
+       green_power: led@5 {
+               label = "green:power";
+               reg = <5>;
+               linux,default-trigger = "default-on";
+       };
+};