linux-kernel - Re: [PATCH V1 2/5] backlight: qcom-wled: Add support for WLED4 peripheral

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Message-ID: <212855c92923c0437feaefae3139cc4a@codeaurora.org>
Date:   Wed, 09 May 2018 10:45:02 +0530
From:   kgunda@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH V1 2/5] backlight: qcom-wled: Add support for WLED4
 peripheral

On 2018-05-08 22:47, Bjorn Andersson wrote:
> On Tue 08 May 03:25 PDT 2018, kgunda@...eaurora.org wrote:
> 
>> On 2018-05-07 21:50, Bjorn Andersson wrote:
>> > On Thu 03 May 02:57 PDT 2018, Kiran Gunda wrote:
> [..]
>> > > +- qcom,ovp
>> > > +	Usage:        optional
>> > > +	Value type:   <u32>
>> > > +	Definition:   mV; Over-voltage protection limit;
>> >
>> > The existing users of qcom,pm8941-wled depends on this being in V, so
>> > you can't change the unit. I suggest that you add a new "qcom,ovp-mv"
>> > property and make the driver fall back to looking for qcom,ovp if that
>> > isn't specified.
>> >
>> > PS. This is a very good example of why it is a good idea to not
>> > restructure and make changes at the same time - I almost missed this.
>> >
>> Actually I have checked the current kernel and none of the properties 
>> are
>> being configured from the device tree node. Hence, i thought it is the 
>> right
>> time modify the units to mV to support the PMI8998.
>> 
> 
> arch/arm/boot/dts/qcom-msm8974-sony-xperia-honami.dts does.
> 
>> You still want to have the qcom,ovp-mv, even though it is not being
>> configured from device tree ?
> 
> Yes, please.
> 
Sure.
>> > > +		      For pm8941:  one of 27000, 29000, 32000, 35000
>> > > +				  Default: 29000 mV
>> > > +		      For pmi8998: one of 18100, 19600, 29600, 31100
>> > > +				  Default: 29600 mV
>> > > +
> 
> Regards,
> Bjorn