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

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Date:   Tue, 22 Feb 2022 08:07:21 -0600
From:   Nishanth Menon <nm@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.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 14:20-20220221, Krzysztof Kozlowski wrote:
> 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.

https://www.kernel.org/doc/Documentation/devicetree/bindings/opp/opp-v1.yaml
comes to mind..

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D