Re: [PATCH v5 4/4] ARM: dts: qcom: ipq8064: Add CPU OPP table

[Konrad Dybcio]

On 10/10/23 22:05, Christian Marangi wrote:
> On Tue, Oct 10, 2023 at 09:55:26PM +0200, Konrad Dybcio wrote:
> > On 9/30/23 12:21, Robert Marko wrote:
> > > From: Christian Marangi <ansuelsmth@xxxxxxxxx>
> > >
> > > Add CPU OPP table for IPQ8062, IPQ8064 and IPQ8065 SoC.
> > > Use opp-supported-hw binding to correctly enable and disable the
> > > frequency as IPQ8062 supports up to 1.0Ghz, IPQ8064 supports up to
> > > 1.4GHz with 1.2GHz as an additional frequency and IPQ8065 supports
> > > 1.7GHZ but doesn't have 1.2GHZ frequency and has to be disabled.
> > >
> > > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
> > > Signed-off-by: Robert Marko <robimarko@xxxxxxxxx>
> > > ---
> > > Changes v4:
> > > * Add OPP DTS patch for IPQ8064
> > >
> > >    arch/arm/boot/dts/qcom/qcom-ipq8062.dtsi | 30 +++++++++++
> > >    arch/arm/boot/dts/qcom/qcom-ipq8064.dtsi | 67 ++++++++++++++++++++++++
> > >    arch/arm/boot/dts/qcom/qcom-ipq8065.dtsi | 65 +++++++++++++++++++++++
> > >    3 files changed, 162 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/qcom/qcom-ipq8062.dtsi b/arch/arm/boot/dts/qcom/qcom-ipq8062.dtsi
> > > index 5d3ebd3e2e51..72d9782c3d6f 100644
> > > --- a/arch/arm/boot/dts/qcom/qcom-ipq8062.dtsi
> > > +++ b/arch/arm/boot/dts/qcom/qcom-ipq8062.dtsi
> > > @@ -6,3 +6,33 @@ / {
> > >    	model = "Qualcomm Technologies, Inc. IPQ8062";
> > >    	compatible = "qcom,ipq8062", "qcom,ipq8064";
> > >    };
> > > +
> > > +&opp_table_cpu {
> > > +	opp-384000000 {
> > > +		opp-microvolt-speed0-pvs0 = <1000000 950000 1050000>;
> > > +		opp-microvolt-speed0-pvs1 = <925000 878750 971250>;
> > > +		opp-microvolt-speed0-pvs2 = <875000 831250 918750>;
> > > +		opp-microvolt-speed0-pvs3 = <800000 760000 840000>;
> > We can just make use of opp-supported-hw and define opp-384...-0,
> > opp-384..-1 etc. with a valid corresponding bitmask in opp-supported-hw
> >
> > otherwise it's somewhat confusing to follow, I think..
>
> Ehh should we really double the nodes for ipq8062 and ipq8065?
Hm.. I'm not 100% sure, both solutions are kinda meh, but perhaps 
overwriting it will be less of a hassle for looking at the decompiled dt 
indeed..

> The idea here was to overwrite the one since the pvs always match and at
> worst(ipq8065) have 7 pvs instead of 4. From the system it would be
> easier to read since only one table is present in the final dts and not
> 2 and referring to the opp-supported-hw.
>
> The original idea was to declare one opp table and reuse pvs version (by
> faking it with hardcoded values) to put additional pvs for ipq8062 and
> ipq8065, but Dmitry didn't like it and asked to move the opp in
> different dtsi.
Yeah this fusing thing is complex enough already

KOnrad