linux-kernel - Re: [PATCH] dt-bindings: ufs: qcom: Add reg-names property for ICE

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Date:   Sat, 10 Dec 2022 12:01:59 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Luca Weiss <luca.weiss@...rphone.com>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        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] dt-bindings: ufs: qcom: Add reg-names property for ICE

On 09/12/2022 20:35, Eric Biggers wrote:
> On Fri, Dec 09, 2022 at 04:19:20PM +0100, Krzysztof Kozlowski wrote:
>> On 09/12/2022 16:11, Luca Weiss wrote:
>>> On Fri Dec 9, 2022 at 4:05 PM CET, Krzysztof Kozlowski wrote:
>>>> On 09/12/2022 15:29, Luca Weiss wrote:
>>>>> The code in ufs-qcom-ice.c needs the ICE reg to be named "ice". Add this
>>>>> in the bindings so the existing dts can validate successfully.
>>>>>
>>>>> Also sm8450 is using ICE since commit 276ee34a40c1 ("arm64: dts: qcom:
>>>>> sm8450: add Inline Crypto Engine registers and clock") so move the
>>>>> compatible to the correct if.
>>>>>
>>>>> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
>>>>> ---
>>>>> (no cover subject)
>>>>>
>>>>> The only remaining validation issues I see is the following on sc8280xp-crd.dtb
>>>>> and sa8540p-ride.dtb:
>>>>>
>>>>>   Unevaluated properties are not allowed ('required-opps', 'dma-coherent' were unexpected)
>>>>>
>>>>> Maybe someone who knows something about this can handle this?
>>>>>
>>>>> And the patch adding qcom,sm6115-ufshc hasn't been applied yet.
>>>>> ---
>>>>>  Documentation/devicetree/bindings/ufs/qcom,ufs.yaml | 8 +++++++-
>>>>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>>> index f2d6298d926c..58a2fb2c83c3 100644
>>>>> --- a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>>> +++ b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
>>>>> @@ -102,7 +102,6 @@ allOf:
>>>>>                - qcom,sc8280xp-ufshc
>>>>>                - qcom,sm8250-ufshc
>>>>>                - qcom,sm8350-ufshc
>>>>> -              - qcom,sm8450-ufshc
>>>>>      then:
>>>>>        properties:
>>>>>          clocks:
>>>>> @@ -130,6 +129,7 @@ allOf:
>>>>>                - qcom,sdm845-ufshc
>>>>>                - qcom,sm6350-ufshc
>>>>>                - qcom,sm8150-ufshc
>>>>> +              - qcom,sm8450-ufshc
>>>>>      then:
>>>>>        properties:
>>>>>          clocks:
>>>>> @@ -149,6 +149,12 @@ allOf:
>>>>>          reg:
>>>>>            minItems: 2
>>>>>            maxItems: 2
>>>>> +        reg-names:
>>>>
>>>> There are no reg-names in top-level, so it's surprising to see its
>>>> customized here. It seems no one ever documented that usage...
>>>
>>> From what I can tell, from driver side all devices not using ICE don't
>>> need reg-names, only the "ice" reg is referenced by name in the driver.
>>>
>>> I didn't add it top-level because with only one reg I think we're not
>>> supposed to use reg-names, right?
>>
>> And you still won't need to use. Yet property should be rather described
>> in top-level which also will unify the items here (so no different
>> 2-item reg-names in variants).
>>
>> Just add it to top-level with minItems: 1 and per variant customize:
>> 1. maxItems: 1
>> 2. minItems: 2 + required
>>
>> The "required" is a bit questionable... this was never added by Eric to
>> the bindings. Driver support and DTS were added completely skipping
>> bindings...
>>
> 
> Sorry about that.  At the time
> (https://lore.kernel.org/linux-scsi/20200722051143.GU388985@builder.lan/T/#t)
> I didn't know there was a Documentation file that should have been updated.

Any change regarding bindings (so adding/changing compatibles,
properties, nodes) a driver is using must be followed by... change in
the bindings.

> 
> The UFS core assumes that the reg at index 0 is the UFS standard registers.
> It is not referenced by name.
> 
> ufs-qcom already had an optional reg at index 1.  I needed to add another
> optional reg.  So I made the regs at index 1 and later be optional named regs:
> dev_ref_clk_ctrl_mem and ice.  That seemed better than hardcoding the indices.
> 
> Is it causing a problem that the UFS standard reg at index 0 is being mixed with
> named regs in the same list?

The indexes should be ordered (hard-coded), not flexible. If there is
already second IO address at index 1, then the patch does not look
correct. When fixing, please fix it completely.

Best regards,
Krzysztof