linux-kernel - Re: [PATCH 09/14] arm64: dts: qcom: sm6115: Add UFS nodes

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Date:   Mon, 5 Sep 2022 12:02:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Iskren Chernev <iskren.chernev@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/14] arm64: dts: qcom: sm6115: Add UFS nodes

On 03/09/2022 19:04, Iskren Chernev wrote:
> 
> 
> On 9/1/22 19:13, Krzysztof Kozlowski wrote:
>> On 01/09/2022 10:24, Iskren Chernev wrote:
>>> The SM6115 comes with UFS support, so add the related UFS and UFS PHY
>>> nodes.
>>>
>>> Signed-off-by: Iskren Chernev <iskren.chernev@...il.com>
>>> ---
>>>  arch/arm64/boot/dts/qcom/sm6115.dtsi | 70 ++++++++++++++++++++++++++++
>>>  1 file changed, 70 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>> index cde963c56ac9..491fffff8aa1 100644
>>> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
>>> @@ -620,6 +620,76 @@ opp-202000000 {
>>>  			};
>>>  		};
>>>
>>> +		ufs_mem_hc: ufshc@...4000 {
>>> +			compatible = "qcom,sm6115-ufshc", "qcom,ufshc",
>>> +				     "jedec,ufs-2.0";
>>> +			reg = <0x4804000 0x3000>, <0x4810000 0x8000>;
>>> +			reg-names = "std", "ice";
>>
>> I could imagine that testing DTS against existing bindings might miss a
>> lot, because we have still a lot of errors. But at least I would expect
>> you test your DTS against your own bindings, which you submit here (and
>> previously).
>>
>> You just wrote that ice is not allowed.
> 
> OK, I'm an idiot. I didn't run the bindings checks, not against existing
> bindings or my bindings or whatever. It's my fault.
> 
> Ice should be allowed, I fixed the bindings in v2.
> 
> For the record, running dtbs_checks is a PITA, not only because of the
> thousands of warnings in unrelated code, but because it takes forever.

You can limit it per schema and/or limit it per target, which would
speed up things. Of course it depends on computer you have, but I don't
find it slow on my laptop and I run them a lot...

> 
> Maybe the docs should be updated with instructions on how to run it on a single
> (or a small subset) of DTBs. I had to comment out a lot of Makefile lines to
> focus it on mine. It would really help if the binding check works more like
> a compiler, not some magic spell hidden in a bunch of Makefiles.

crosc.... make -j8 DT_SCHEMA_FILES=exynos-srom.yaml CHECK_DTBS=y
qcom/sm8450-hdk.dtb


> 
> I'll list all remaining issues with description/explanation in v2. The fact
> that some bindings break on all DTBs present doesn't help either.

We're working on this... It's quite a lot of effort, especially when new
warnings are being added. :)


Best regards,
Krzysztof