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Message-ID: <20180926130921.12329-5-dmurphy@ti.com>
Date: Wed, 26 Sep 2018 08:09:16 -0500
From: Dan Murphy <dmurphy@...com>
To: <robh+dt@...nel.org>, <jacek.anaszewski@...il.com>, <pavel@....cz>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<lee.jones@...aro.org>, <linux-omap@...r.kernel.org>,
<linux-leds@...r.kernel.org>, Dan Murphy <dmurphy@...com>
Subject: [RFC PATCH 4/9] dt-bindings: leds: Add bindings for lm3697 driver
Add the device tree bindings for the lm3697
LED driver for backlighting and display.
Signed-off-by: Dan Murphy <dmurphy@...com>
---
.../devicetree/bindings/leds/leds-lm3697.txt | 98 +++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt
diff --git a/Documentation/devicetree/bindings/leds/leds-lm3697.txt b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
new file mode 100644
index 000000000000..4bb2ed51025b
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
@@ -0,0 +1,98 @@
+* Texas Instruments - LM3697 Highly Efficient White LED Driver
+
+The LM3697 11-bit LED driver provides high-
+performance backlight dimming for 1, 2, or 3 series
+LED strings while delivering up to 90% efficiency.
+
+This device is suitable for display and keypad Lighting
+
+Required properties:
+ - compatible:
+ "ti,lm3697"
+ - reg : I2C slave address
+ - #address-cells : 1
+ - #size-cells : 0
+
+Optional properties:
+ - enable-gpios : GPIO pin to enable/disable the device
+ - vled-supply : LED supply
+
+Required child properties:
+ - reg : 0 - LED is Controlled by bank A
+ 1 - LED is Controlled by bank B
+ - led-sources : Indicates which HVLED string is associated to which
+ control bank. Each element in the array is associated
+ with a specific HVLED string. Element 0 is HVLED1,
+ element 1 is HVLED2 and element 2 HVLED3.
+ Additional information is contained
+ in Documentation/devicetree/bindings/leds/common.txt
+ 0 - HVLED is not active in this control bank
+ 1 - HVLED string is controlled by this control bank
+
+Optional child properties:
+ - runtime-ramp-up-msec: Current ramping from one brightness level to
+ the a higher brightness level.
+ Range from 2048 us - 117.44 s
+ - runtime-ramp-down-msec: Current ramping from one brightness level to
+ the a lower brightness level.
+ Range from 2048 us - 117.44 s
+ - label : see Documentation/devicetree/bindings/leds/common.txt
+ - linux,default-trigger :
+ see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
+controlled by control bank B.
+
+led-controller@36 {
+ compatible = "ti,lm3697";
+ reg = <0x36>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+ vled-supply = <&vbatt>;
+
+ led@0 {
+ reg = <0>;
+ led-sources = <1 0 1>;
+ runtime-ramp-up-msec = <5000>;
+ runtime-ramp-down-msec = <1000>;
+ label = "white:first_backlight_cluster";
+ linux,default-trigger = "backlight";
+ };
+
+ led@1 {
+ reg = <1>;
+ led-sources = <0 1 0>;
+ runtime-ramp-up-msec = <500>;
+ runtime-ramp-down-msec = <1000>;
+ label = "white:second_backlight_cluster";
+ linux,default-trigger = "backlight";
+ };
+}
+
+All HVLED strings controlled by control bank A
+
+led-controller@36 {
+ compatible = "ti,lm3697";
+ reg = <0x36>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+ vled-supply = <&vbatt>;
+
+ led@0 {
+ reg = <0>;
+ led-sources = <1 1 1>;
+ runtime-ramp-up-msec = <500>;
+ runtime-ramp-down-msec = <1000>;
+ label = "white:backlight_cluster";
+ linux,default-trigger = "backlight";
+ };
+}
+
+For more product information please see the link below:
+http://www.ti.com/lit/ds/symlink/lm3697.pdf
--
2.19.0
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