linux-kernel - [PATCH v9 2/3] leds: ktd2692: add device tree bindings for ktd2692

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Date:	Tue, 12 May 2015 17:37:56 +0900
From:	Ingi Kim <ingi2.kim@...sung.com>
To:	cooloney@...il.com, rpurdie@...ys.net, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
Cc:	sakari.ailus@....fi, j.anaszewski@...sung.com,
	varkabhadram@...il.com, joe@...ches.com, sw0312.kim@...sung.com,
	cw00.choi@...sung.com, jh80.chung@...sung.com,
	ideal.song@...sung.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
	Ingi Kim <ingi2.kim@...sung.com>
Subject: [PATCH v9 2/3] leds: ktd2692: add device tree bindings for ktd2692

This patch adds the device tree bindings for ktd2692 flash LEDs.
Add Optional properties of child node for Flash LED

Signed-off-by: Ingi Kim <ingi2.kim@...sung.com>
Acked-by: Seung-Woo Kim <sw0312.kim@...sung.com>
Reviewed-by: Varka Bhadram <varkabhadram@...il.com>
---
 .../devicetree/bindings/leds/leds-ktd2692.txt      | 50 ++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-ktd2692.txt

diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
new file mode 100644
index 0000000..8537374
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
@@ -0,0 +1,50 @@
+* Kinetic Technologies - KTD2692 Flash LED Driver
+
+KTD2692 is the ideal power solution for high-power flash LEDs.
+It uses ExpressWire single-wire programming for maximum flexibility.
+
+The ExpressWire interface through CTRL pin can control LED on/off and
+enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode current,
+Flash timeout, LVP(low voltage protection).
+
+Also, When the AUX pin is pulled high while CTRL pin is high,
+LED current will be ramped up to the flash-mode current level.
+
+Required properties:
+- compatible : Should be "kinetic,ktd2692".
+- ctrl-gpios : Specifier of the GPIO connected to CTRL pin.
+- aux-gpios : Specifier of the GPIO connected to AUX pin.
+
+Optional properties:
+- vin-supply : "vin" LED supply (2.7V to 5.5V).
+  See Documentation/devicetree/bindings/regulator/regulator.txt
+
+A discrete LED element connected to the device must be represented by a child
+node - See Documentation/devicetree/bindings/leds/common.txt
+
+Required properties for flash LED child nodes:
+  See Documentation/devicetree/bindings/leds/common.txt
+- led-max-microamp : Minimum Threshold for Timer protection
+  is defined internally (Maximum 300mA).
+- flash-max-microamp : Flash LED maximum current
+  Formula : I(mA) = 15000 / Rset.
+- flash-max-timeout-us : Flash LED maximum timeout.
+
+Optional properties for flash LED child nodes:
+- label : See Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+ktd2692 {
+	compatible = "kinetic,ktd2692";
+	ctrl-gpios = <&gpc0 1 0>;
+	aux-gpios = <&gpc0 2 0>;
+	vin-supply = <&vbat>;
+
+	flash-led {
+		label = "ktd2692-flash";
+		led-max-microamp = <300000>;
+		flash-max-microamp = <1500000>;
+		flash-max-timeout-us = <1835000>;
+	};
+};
-- 
2.0.5

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