linux-kernel - Re: [PATCH 1/3] arm64: dts: qcom: sm8350: Remove second reg from pdc

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Date:   Wed, 17 Mar 2021 13:08:02 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Marc Zyngier <maz@...nel.org>, Maulik Shah <mkshah@...eaurora.org>
Cc:     swboyd@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        dianders@...omium.org, rnayak@...eaurora.org, lsrao@...eaurora.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: qcom: sm8350: Remove second reg from pdc

On Wed 17 Mar 09:02 CDT 2021, Marc Zyngier wrote:

> On Wed, 17 Mar 2021 09:48:09 +0000,
> Maulik Shah <mkshah@...eaurora.org> wrote:
> > 
> > Hi Marc,
> > 
> > On 3/17/2021 2:47 PM, Marc Zyngier wrote:
> > > On Wed, 17 Mar 2021 05:29:54 +0000,
> > > Maulik Shah <mkshah@...eaurora.org> wrote:
> > >> PDC interrupt controller driver do not use second reg. Remove it.
> > > This is a DT file, not a driver. What the driver does is irrelevant.
> > > 
> > > The real question is: what does this range do?
> > > 
> > > Thanks,
> > > 
> > > 	M.
> > 
> > This is to set interrupt type in SPI config for which there was a
> > change [1] but has not gone in for upstream PDC driver.
> > 
> > The second reg is not used in upstream PDC driver, probably when
> > posting downstream DT changes for sm8350/sm8250 it was carried in
> > device node as is.
> > 
> > As its not mentioned in bindigs as well, dtbs_check reports it as
> > additional reg when converted to yaml.
> 
> Then I'd rather you provide accurate documentation in the binding
> rather than changing the DT files. Other operating systems may use it,
> and it isn't unlikely that Linux could use the feature at some point.
> 

I agree. Maulik, please update the DT binding to document this region as
well.


It also seems relevant to pursue getting [1] into the upstream Linux
kernel. Is this something that you use downstream Maulik?

Regards,
Bjorn