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backlight: qcom-wled: Restructure the qcom-wled bindings
Restructure the qcom-wled bindings for the better readability. Signed-off-by: Kiran Gunda <kgunda@codeaurora.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Binding for Qualcomm Technologies, Inc. WLED driver
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Required properties:
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- compatible: should be "qcom,pm8941-wled"
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- reg: slave address
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WLED (White Light Emitting Diode) driver is used for controlling display
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backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
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platforms. The PMIC is connected to the host processor via SPMI bus.
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Optional properties:
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- default-brightness: brightness value on boot, value from: 0-4095
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default: 2048
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- label: The name of the backlight device
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- qcom,cs-out: bool; enable current sink output
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- qcom,cabc: bool; enable content adaptive backlight control
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- qcom,ext-gen: bool; use externally generated modulator signal to dim
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- qcom,current-limit: mA; per-string current limit; value from 0 to 25
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default: 20mA
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- qcom,current-boost-limit: mA; boost current limit; one of:
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105, 385, 525, 805, 980, 1260, 1400, 1680
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default: 805mA
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- qcom,switching-freq: kHz; switching frequency; one of:
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600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371,
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1600, 1920, 2400, 3200, 4800, 9600,
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default: 1600kHz
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- qcom,ovp: V; Over-voltage protection limit; one of:
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27, 29, 32, 35
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default: 29V
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- qcom,num-strings: #; number of led strings attached; value from 1 to 3
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default: 2
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- compatible
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Usage: required
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Value type: <string>
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Definition: should be one of:
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"qcom,pm8941-wled"
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"qcom,pmi8998-wled"
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"qcom,pm660l-wled"
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- reg
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Usage: required
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Value type: <prop encoded array>
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Definition: Base address of the WLED modules.
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- default-brightness
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Usage: optional
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Value type: <u32>
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Definition: brightness value on boot, value from: 0-4095
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Default: 2048
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- label
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Usage: required
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Value type: <string>
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Definition: The name of the backlight device
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- qcom,cs-out
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Usage: optional
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Value type: <bool>
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Definition: enable current sink output.
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This property is supported only for PM8941.
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- qcom,cabc
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Usage: optional
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Value type: <bool>
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Definition: enable content adaptive backlight control.
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- qcom,ext-gen
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Usage: optional
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Value type: <bool>
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Definition: use externally generated modulator signal to dim.
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This property is supported only for PM8941.
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- qcom,current-limit
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Usage: optional
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Value type: <u32>
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Definition: mA; per-string current limit
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value: For pm8941: from 0 to 25 with 5 mA step
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Default 20 mA.
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For pmi8998: from 0 to 30 with 5 mA step
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Default 25 mA.
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- qcom,current-boost-limit
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Usage: optional
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Value type: <u32>
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Definition: mA; boost current limit.
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For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
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1680. Default: 805 mA
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For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
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1500. Default: 970 mA
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- qcom,switching-freq
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Usage: optional
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Value type: <u32>
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Definition: kHz; switching frequency; one of: 600, 640, 685, 738,
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800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
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4800, 9600.
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Default: for pm8941: 1600 kHz
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for pmi8998: 800 kHz
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- qcom,ovp
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Usage: optional
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Value type: <u32>
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Definition: V; Over-voltage protection limit; one of:
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27, 29, 32, 35. default: 29V
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This property is supported only for PM8941.
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- qcom,num-strings
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Usage: optional
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Value type: <u32>
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Definition: #; number of led strings attached;
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value from 1 to 3. default: 2
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This property is supported only for PM8941.
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Example:
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