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Message-ID: <Y43uUA2X4Vzn+VLF@hovoldconsulting.com>
Date: Mon, 5 Dec 2022 14:12:48 +0100
From: Johan Hovold <johan@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Johan Hovold <johan+linaro@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
Andy Gross <agross@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Bart Van Assche <bvanassche@....org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: ufs: qcom: allow 'dma-coherent' property
On Mon, Dec 05, 2022 at 06:30:48PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Dec 05, 2022 at 01:27:34PM +0100, Johan Hovold wrote:
> > On Mon, Dec 05, 2022 at 05:50:18PM +0530, Manivannan Sadhasivam wrote:
> > > On Mon, Dec 05, 2022 at 01:07:16PM +0100, Johan Hovold wrote:
> > > > On Mon, Dec 05, 2022 at 05:29:06PM +0530, Manivannan Sadhasivam wrote:
> > > > > On Mon, Dec 05, 2022 at 11:08:36AM +0100, Johan Hovold wrote:
> > > > > > UFS controllers may be cache coherent and must be marked as such in the
> > > > > > devicetree to avoid data corruption.
> > > > > >
> > > > > > This is specifically needed on recent Qualcomm platforms like SC8280XP.
> > > > > >
> > > > > > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > > > Yes, it would be a valid, but it will only be added to the DTs of SoCs
> > > > that actually require it. No need to re-encode the dtsi in the binding.
> > > >
> > >
> > > But if you make a property valid in the binding then it implies that anyone
> > > could add it to DTS which is wrong. You should make this property valid for
> > > SoCs that actually support it.
> >
> > No, it's not wrong.
> >
> > Note that the binding only requires 'compatible' and 'regs', all other
> > properties are optional, and you could, for example, add a
> > 'reset' property to a node for a device which does not have a reset
> > without the DT validation failing.
> >
>
> Then what is the point of devicetree validation using bindings?
You're still making sure that no properties are added that are not
documented, number of clocks, names of clocks, etc.
> There is also a comment from Krzysztof: https://lkml.org/lkml/2022/11/24/390
Speaking of Krzysztof:
https://lore.kernel.org/lkml/20221204094717.74016-5-krzysztof.kozlowski@linaro.org/
Johan
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