linux-kernel - Re: [RFC PATCH 8/8] arm64: dts: ti: use 'freq-table' in UFS node

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Date:   Mon, 21 Feb 2022 14:20:12 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Nishanth Menon <nm@...com>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Wei Xu <xuwei5@...ilicon.com>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Chanho Park <chanho61.park@...sung.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Jan Kotas <jank@...ence.com>, linux-scsi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [RFC PATCH 8/8] arm64: dts: ti: use 'freq-table' in UFS node

On 21/02/2022 14:13, Nishanth Menon wrote:
> On 19:45-20220219, Krzysztof Kozlowski wrote:
>> The 'freq-table-hz' property is deprecated by UFS bindings.
>> The uint32-array requires also element to be passed within one <> block.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> ---
>>  arch/arm64/boot/dts/ti/k3-j721e-main.dtsi | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> index 599861259a30..c3afef0321ae 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> @@ -1257,7 +1257,9 @@ ufs@...4000 {
>>  			compatible = "cdns,ufshc-m31-16nm", "jedec,ufs-2.0";
>>  			reg = <0x0 0x4e84000 0x0 0x10000>;
>>  			interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
>> -			freq-table-hz = <250000000 250000000>, <19200000 19200000>, <19200000 19200000>;
>> +			freq-table = <250000000 250000000
> 
> <min max> is much more readable and less error prone in case of a large
> set.

Pairs are easily visible if split per line, so readability is similar.
Not much is lost.

> 
>> +				      19200000 19200000
>> +				      19200000 19200000>;
> 
> are you sure the removal of the tuple adds value?

DT schema requires it, or rather: I do not know how to express uint32
tuples in DT schema. All my tries failed.


Best regards,
Krzysztof