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Date: Mon, 2 Nov 2015 14:01:09 +0900 From: Milo Kim <milo.kim@...com> To: <devicetree@...r.kernel.org>, <lee.jones@...aro.org>, <linux-kernel@...r.kernel.org> CC: Milo Kim <milo.kim@...com>, Jingoo Han <jingoohan1@...il.com> Subject: [PATCH 02/16] Documentation: dt-bindings: backlight: add TI LMU backlight binding information LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697 use common dt-bindings for describing device. Cc: devicetree@...r.kernel.org Cc: Jingoo Han <jingoohan1@...il.com> Cc: Lee Jones <lee.jones@...aro.org> Cc: linux-kernel@...r.kernel.org Signed-off-by: Milo Kim <milo.kim@...com> --- .../bindings/video/backlight/ti-lmu-backlight.txt | 67 ++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt diff --git a/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt b/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt new file mode 100644 index 0000000..27b0036 --- /dev/null +++ b/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt @@ -0,0 +1,67 @@ +TI LMU backlight device tree bindings + +Required properties: + - compatible: Should be one of lists below. + "ti,lm3532-backlight" + "ti,lm3631-backlight" + "ti,lm3632-backlight" + "ti,lm3633-backlight" + "ti,lm3695-backlight" + "ti,lm3697-backlight" + +Optional properties: + There are two backlight control mode. One is I2C, the other is PWM mode. + Following properties are only specified in PWM mode. + Please note that LMU backlight device can have only one PWM channel. + + - pwms: OF device-tree PWM specification. + - pwm-names: a list of names for the PWM devices specified in the "pwms" + property. + + For the PWM user nodes, please refer to [1]. + +Child nodes: + LMU backlight is represented as sub-nodes of the TI LMU device [2]. + So, LMU backlight should have more than one backlight child node. + Each node exactly matches with backlight control bank configuration. + Maximum numbers of child nodes depend on the device. + 1 = LM3631, LM3632, LM3695 + 2 = LM3633, LM3697 + 3 = LM3532 + + Required property of a child node: + - hvled1-used, hvled2-used, hvled3-used: + High voltage backlight strings configuration. Type is <boolean>. + Please describe which output backlight string is used. + Please refer to the datasheets [3]. + + Optional properties of a child node: + - backlight-name: Name string for backlight device identification. + It is used for creating backlight sysfs, + /sys/class/backlight/<backlight-name>/. + - backlight-max-microamp: Max current setting. Type is <u32>. + Unit is microampere. + Range is from 5000 to 30000. + - initial-brightness: Backlight initial brightness value. Type is <u32>. + It is set as soon as backlight device is created. + 0 ~ 2047 = LM3631, LM3632, LM3633, LM3695 and LM3697 + 0 ~ 255 = LM3532 + - ramp-up-msec, ramp-down-msec: Light dimming effect properties. + Type is <u32>. Unit is millisecond. + 0 ~ 65 msec = LM3532 + 0 ~ 4000 msec = LM3631 + 0 ~ 16000 msec = LM3633 and LM3697 + - pwm-period: PWM period. Only valid in PWM brightness mode. + Type is <u32>. If this property is missing, then control + mode is set to I2C by default. + +Examples: Please refer to ti-lmu dt-bindings. [2]. + +[1] Documentation/devicetree/bindings/pwm/pwm.txt +[2] Documentation/devicetree/bindings/mfd/ti-lmu.txt +[3] LM3532: http://www.ti.com/product/LM3532/datasheet + LM3631: http://www.ti.com/product/LM3631/datasheet + LM3632: http://www.ti.com/product/LM3632A/datasheet + LM3633: http://www.ti.com/product/LM3633/datasheet + LM3695: Datasheet is not opened yet, but only two strings are used. + LM3697: http://www.ti.com/product/LM3697/datasheet -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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