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From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Taniya Das <tdas@codeaurora.org>,
	linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-scsi@vger.kernel.org,
	Rob Herring <robh@kernel.org>
Subject: Re: [PATCH v3 3/7] dt-bindings: ufs: common: add OPP table
Date: Sat, 14 May 2022 00:02:20 +0530	[thread overview]
Message-ID: <20220513183220.GE1922@thinkpad> (raw)
In-Reply-To: <20220513174010.GC1922@thinkpad>

On Fri, May 13, 2022 at 11:10:20PM +0530, Manivannan Sadhasivam wrote:
> On Fri, May 13, 2022 at 08:13:43AM +0200, Krzysztof Kozlowski wrote:
> > Except scaling UFS and bus clocks, it's necessary to scale also the
> > voltages of regulators or power domain performance state levels.  Adding
> > Operating Performance Points table allows to adjust power domain
> > performance state, depending on the UFS clock speed.
> > 
> > OPPv2 deprecates previous property limited to clock scaling:
> > freq-table-hz.
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> > Reviewed-by: Rob Herring <robh@kernel.org>
> > 
> > ---
> > 
> > Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> >  .../devicetree/bindings/ufs/ufs-common.yaml   | 34 +++++++++++++++++--
> >  1 file changed, 31 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> > index 47a4e9e1a775..d7d2c8a136bb 100644
> > --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> > +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml
> > @@ -20,11 +20,24 @@ properties:
> >        items:
> >          - description: Minimum frequency for given clock in Hz
> >          - description: Maximum frequency for given clock in Hz
> > +    deprecated: true
> >      description: |
> > +      Preferred is operating-points-v2.
> > +
> >        Array of <min max> operating frequencies in Hz stored in the same order
> > -      as the clocks property. If this property is not defined or a value in the
> > -      array is "0" then it is assumed that the frequency is set by the parent
> > -      clock or a fixed rate clock source.
> > +      as the clocks property. If either this property or operating-points-v2 is
> > +      not defined or a value in the array is "0" then it is assumed that the
> > +      frequency is set by the parent clock or a fixed rate clock source.
> > +
> > +  operating-points-v2:
> > +    description:
> > +      Preferred over freq-table-hz.
> > +      If present, each OPP must contain array of frequencies stored in the same
> > +      order for each clock.  If clock frequency in the array is "0" then it is
> > +      assumed that the frequency is set by the parent clock or a fixed rate
> > +      clock source.
> 
> This description mentions only the clocks and not voltages. But in theory, the
> OPP table can contain other parameters like current, bandwidth, etc,... So to
> avoid confusion, I'd suggest to get rid of the description.
> 
> > +
> > +  opp-table: true
> >  
> >    interrupts:
> >      maxItems: 1
> > @@ -75,8 +88,23 @@ properties:
> >  
> >  dependencies:
> >    freq-table-hz: [ 'clocks' ]
> > +  operating-points-v2: [ 'clocks', 'clock-names' ]
> 
> What about voltage regulators if relevant opp property is present?
> 

Current UFS driver model won't allow us to change both voltage supplies and clks
using OPP implementation. So please ignore my above comment.

Thanks,
Mani

> Thanks,
> Mani
> 
> >  
> >  required:
> >    - interrupts
> >  
> > +allOf:
> > +  - if:
> > +      required:
> > +        - freq-table-hz
> > +    then:
> > +      properties:
> > +        operating-points-v2: false
> > +  - if:
> > +      required:
> > +        - operating-points-v2
> > +    then:
> > +      properties:
> > +        freq-table-hz: false
> > +
> >  additionalProperties: true
> > -- 
> > 2.32.0
> > 
> 
> -- 
> மணிவண்ணன் சதாசிவம்

-- 
மணிவண்ணன் சதாசிவம்

  reply	other threads:[~2022-05-13 18:32 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-13  6:13 [PATCH v3 0/7] ufs: set power domain performance state when scaling gears Krzysztof Kozlowski
2022-05-13  6:13 ` [PATCH v3 1/7] dt-bindings: clock: qcom,gcc-sdm845: add parent power domain Krzysztof Kozlowski
2022-05-13 15:51   ` Manivannan Sadhasivam
2022-06-28 20:19   ` (subset) " Bjorn Andersson
2022-05-13  6:13 ` [PATCH v3 2/7] dt-bindings: opp: accept array of frequencies Krzysztof Kozlowski
2022-05-13 17:22   ` Manivannan Sadhasivam
2022-06-30  9:55   ` Viresh Kumar
2022-05-13  6:13 ` [PATCH v3 3/7] dt-bindings: ufs: common: add OPP table Krzysztof Kozlowski
2022-05-13 17:40   ` Manivannan Sadhasivam
2022-05-13 18:32     ` Manivannan Sadhasivam [this message]
2022-05-13  6:13 ` [PATCH v3 4/7] arm64: dts: qcom: sdm845: control RPMHPD performance states with UFS Krzysztof Kozlowski
2022-05-25  7:16   ` Viresh Kumar
2022-05-30  7:42     ` Krzysztof Kozlowski
2022-05-13  6:13 ` [PATCH v3 5/7] PM: opp: allow control of multiple clocks Krzysztof Kozlowski
2022-05-13  6:13 ` [PATCH v3 6/7] PM: opp: parse multiple frequencies in each OPP Krzysztof Kozlowski
2022-05-13  6:13 ` [PATCH v3 7/7] ufs: use PM OPP when scaling gears Krzysztof Kozlowski
2022-05-13 18:25   ` Manivannan Sadhasivam
2022-05-16  6:10     ` Krzysztof Kozlowski

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