linux-kernel - Re: [PATCH v2 01/15] dt-bindings: ufs: add common platform bindings

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Message-ID: <8ba5fb1b-2b5f-e625-0dbe-2acc3b6656e7@canonical.com>
Date:   Sun, 27 Feb 2022 11:24:13 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jan Kotas <jank@...ence.com>, Li Wei <liwei213@...wei.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Yaniv Gardi <ygardi@...eaurora.org>,
        linux-scsi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 01/15] dt-bindings: ufs: add common platform bindings

On 25/02/2022 20:26, Rob Herring wrote:
> On Tue, Feb 22, 2022 at 03:58:40PM +0100, Krzysztof Kozlowski wrote:
>> Add bindings for common parts (platform) of Universal Flash Storage
>> (UFS) Host Controllers in dtschema format.
>>
>> The 'freq-table-hz' is not correct in dtschema, because '-hz' suffix
>> defines uint32 type, not an array.  Therefore deprecate 'freq-table-hz'
>> and use 'freq-table' instead.
> 
> -hz is an array type. We can extend it to matrix if needed.
> 
> I do think this property is a bit questionable. Do we really need a 
> minimum in DT and if not, wouldn't assigned-clocks-rate work? Or an OPP 
> table.
> 

I think the proper solution is OPP table, see also comments from Bjorn:
https://lore.kernel.org/all/YhUodbzxx4wbr+gy@ripper/

I would rather refrain from converting it to OPP tables, because I won't
be able to test any changes in the driver.


Best regards,
Krzysztof