linux-kernel - Re: [PATCH 1/2] leds: add DT binding for Qualcomm PM8941 WLED block

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Date:	Tue, 16 Dec 2014 17:15:53 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...aro.org>
CC:	Courtney Cavin <courtney.cavin@...ymobile.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] leds: add DT binding for Qualcomm PM8941 WLED block

On 12/08/2014 04:22 PM, Bjorn Andersson wrote:

> +
> +Optional properties:
> +- label: The label for this led
> +  See Documentation/devicetree/bindings/leds/common.txt
> +- linux,default-trigger: Default trigger assigned to the LED
> +  See Documentation/devicetree/bindings/leds/common.txt
> +- qcom,cs-out: bool; enable current sink output
> +- qcom,cabc: bool; enable content adaptive backlight control
> +- qcom,ext-gen: bool; use externally generated modulator signal to dim
> +- qcom,current-limit: mA; per-string current limit; value from 0 to 25
> +	default: 20mA
> +- qcom,current-boost-limit: mA; boost current limit; one of:
> +	105, 385, 525, 805, 980, 1260, 1400, 1680
> +	default: 805mA
> +- qcom,switching-freq: kHz; switching frequency; one of:
> +	600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371,
> +	1600, 1920, 2400, 3200, 4800, 9600,
> +	default: 1600kHz
> +- qcom,ovp: V; Over-voltage protection limit; one of:
> +	27, 29, 32, 35
> +	default: 29V

It would be nice if the units were part of the property name, i.e.
qcom,ovp-V, qcom,current-boost-limit-mA, etc. That way the units are
known without having to refer to the documentation.

> +- qcom,num-strings: #; number of led strings attached; value from 1 to 3
> +	default: 2

I wonder if qcom,#strings is more appropriate?

> +
> +Example:
> +
> +pm8941-wled@...0 {
> +	compatible = "qcom,pm8941-wled";
> +	reg = <0xd800>;
> +	label = "backlight";
> +
> +	qcom,cs-out;
> +	qcom,current-limit = <20>;
> +	qcom,current-boost-limit = <805>;
> +	qcom,switching-freq = <1600>;
> +	qcom,ovp = <29>;
> +	qcom,num-strings = <2>;
> +};


-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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