mirror of https://github.com/parazyd/arm-sdk.git
90 lines
3.5 KiB
Diff
90 lines
3.5 KiB
Diff
From ce34e7400299f5130f4f78bf3e894905373bc3c3 Mon Sep 17 00:00:00 2001
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From: Milo Kim <Milo.Kim@ti.com>
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Date: Mon, 17 Jul 2017 15:39:55 +0200
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Subject: [PATCH 15/17] dt-bindings: backlight: add ti-lmu-backlight binding
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Add DT binding for ti-lmu devices.
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Signed-off-by: Milo Kim <milo.kim@ti.com>
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Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
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---
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.../bindings/leds/backlight/ti-lmu-backlight.txt | 66 ++++++++++++++++++++++
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1 file changed, 66 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
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diff --git a/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
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new file mode 100644
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index 0000000..5fb1458
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
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@@ -0,0 +1,66 @@
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+TI LMU backlight device tree bindings
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+
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+Required property:
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+ - compatible: Should be one of:
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+ "ti,lm3532-backlight"
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+ "ti,lm3631-backlight"
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+ "ti,lm3632-backlight"
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+ "ti,lm3633-backlight"
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+ "ti,lm3695-backlight"
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+ "ti,lm3697-backlight"
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+
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+Optional properties:
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+ There are two backlight control mode. One is I2C, the other is PWM mode.
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+ Following properties are only specified in PWM mode.
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+ Please note that LMU backlight device can have only one PWM channel.
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+
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+ - pwms: OF device-tree PWM specification.
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+ - pwm-names: a list of names for the PWM devices specified in the "pwms"
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+ property.
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+
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+ For the PWM user nodes, please refer to [1].
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+
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+Child nodes:
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+ LMU backlight is represented as sub-nodes of the TI LMU device [2].
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+ So, LMU backlight should have more than one backlight child node.
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+ Each node exactly matches with backlight control bank configuration.
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+ Maximum numbers of child nodes depend on the device.
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+
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+ 1 = LM3631, LM3632, LM3695
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+ 2 = LM3633, LM3697
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+ 3 = LM3532
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+
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+ Required property of a child node:
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+ - led-sources: List of enabled channels from 0 to 2.
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+ Please refer to LED binding [3].
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+ For output channels, please refer to the datasheets [4].
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+
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+ Optional properties of a child node:
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+ - label: Backlight channel identification.
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+ Please refer to LED binding [3].
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+ - default-brightness-level: Backlight initial brightness value.
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+ Type is <u32>. It is set as soon as backlight
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+ device is created.
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+ 0 ~ 2047 = LM3631, LM3632, LM3633, LM3695 and
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+ LM3697
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+ 0 ~ 255 = LM3532
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+ - ramp-up-msec, ramp-down-msec: Light dimming effect properties.
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+ Type is <u32>. Unit is millisecond.
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+ 0 ~ 65 msec = LM3532
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+ 0 ~ 4000 msec = LM3631
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+ 0 ~ 16000 msec = LM3633 and LM3697
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+ - pwm-period: PWM period. Only valid in PWM brightness mode.
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+ Type is <u32>. If this property is missing, then control
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+ mode is set to I2C by default.
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+
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+Examples: Please refer to ti-lmu dt-bindings. [2].
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+
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+[1] ../pwm/pwm.txt
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+[2] ../mfd/ti-lmu.txt
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+[3] ../leds/common.txt
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+[4] LM3532: http://www.ti.com/product/LM3532/datasheet
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+ LM3631: http://www.ti.com/product/LM3631/datasheet
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+ LM3632: http://www.ti.com/product/LM3632A/datasheet
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+ LM3633: http://www.ti.com/product/LM3633/datasheet
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+ LM3695: Datasheet is not opened yet, but only two strings are used.
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+ LM3697: http://www.ti.com/product/LM3697/datasheet
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--
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2.1.4
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