From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Tue, 08 May 2018 17:17:36 +0000
Subject: Re: [PATCH V1 2/5] backlight: qcom-wled: Add support for WLED4 peripheral
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To: kgunda@codeaurora.org
Cc: Lee Jones <lee.jones@linaro.org>, Daniel Thompson <daniel.thompson@linaro.org>, Jingoo Han <jingoohan1@gmail.com>, Jacek Anaszewski <jacek.anaszewski@gmail.com>, Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-arm-msm@vger.kernel.org

On Tue 08 May 03:25 PDT 2018, kgunda@codeaurora.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.

> > > +		      For pm8941:  one of 27000, 29000, 32000, 35000
> > > +				  Default: 29000 mV
> > > +		      For pmi8998: one of 18100, 19600, 29600, 31100
> > > +				  Default: 29600 mV
> > > +

Regards,
Bjorn