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Date: Mon, 6 Apr 2020 20:03:34 +0200
From: Clément Péron <peron.clem@...il.com>
To: Maxime Ripard <maxime@...no.tech>
Cc: Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
devicetree <devicetree@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-sunxi <linux-sunxi@...glegroups.com>,
Ondrej Jirman <megous@...ous.com>
Subject: Re: [PATCH v2 3/7] arm64: dts: allwinner: h6: Add CPU Operating
Performance Points table
Hi,
On Mon, 6 Apr 2020 at 10:14, Maxime Ripard <maxime@...no.tech> wrote:
>
> On Sun, Apr 05, 2020 at 07:35:57PM +0200, Clément Péron wrote:
> > From: Ondrej Jirman <megous@...ous.com>
> >
> > Add an Operating Performance Points table for the CPU cores to
> > enable Dynamic Voltage & Frequency Scaling on the H6.
> >
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > ---
> > .../boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi | 121 ++++++++++++++++++
> > arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 4 +
> > 2 files changed, 125 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi
> > new file mode 100644
> > index 000000000000..8c1e413c6af9
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-cpu-opp.dtsi
> > @@ -0,0 +1,121 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +// Copyright (C) 2020 Ondrej Jirman <megous@...ous.com>
> > +// Copyright (C) 2020 Clément Péron <peron.clem@...il.com>
> > +
> > +/ {
> > + cpu0_opp_table: opp_table0 {
>
> Node names shouldn't have an underscore, this will trigger a DTC
> warning.
>
> > + compatible = "allwinner,sun50i-h6-operating-points";
> > + nvmem-cells = <&speedbin_efuse>;
> > + opp-shared;
> > +
> > + opp@...000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <480000000>;
> > +
> > + opp-microvolt-speed0 = <880000>;
> > + opp-microvolt-speed1 = <820000>;
> > + opp-microvolt-speed2 = <820000>;
> > + };
>
> And similarly, if you have a unit-address (the part after @), you
> should have a matching reg property. You should use a dash instead.
>
> > + opp@...000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <720000000>;
> > +
> > + opp-microvolt-speed0 = <880000>;
> > + opp-microvolt-speed1 = <820000>;
> > + opp-microvolt-speed2 = <820000>;
> > + };
> > +
> > + opp@...000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <816000000>;
> > +
> > + opp-microvolt-speed0 = <880000>;
> > + opp-microvolt-speed1 = <820000>;
> > + opp-microvolt-speed2 = <820000>;
> > + };
> > +
> > + opp@...000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <888000000>;
> > +
> > + opp-microvolt-speed0 = <880000>;
> > + opp-microvolt-speed1 = <820000>;
> > + opp-microvolt-speed2 = <820000>;
> > + };
> > +
> > + opp@...0000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1080000000>;
> > +
> > + opp-microvolt-speed0 = <940000>;
> > + opp-microvolt-speed1 = <880000>;
> > + opp-microvolt-speed2 = <880000>;
> > + };
> > +
> > + opp@...0000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1320000000>;
> > +
> > + opp-microvolt-speed0 = <1000000>;
> > + opp-microvolt-speed1 = <940000>;
> > + opp-microvolt-speed2 = <940000>;
> > + };
> > +
> > + opp@...8000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1488000000>;
> > +
> > + opp-microvolt-speed0 = <1060000>;
> > + opp-microvolt-speed1 = <1000000>;
> > + opp-microvolt-speed2 = <1000000>;
> > + };
> > +
> > + opp@...8000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1608000000>;
> > +
> > + opp-microvolt-speed0 = <1090000>;
> > + opp-microvolt-speed1 = <1030000>;
> > + opp-microvolt-speed2 = <1030000>;
> > + };
> > +
> > + opp@...4000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1704000000>;
> > +
> > + opp-microvolt-speed0 = <1120000>;
> > + opp-microvolt-speed1 = <1060000>;
> > + opp-microvolt-speed2 = <1060000>;
> > + };
> > +
> > + opp@...0000000 {
> > + clock-latency-ns = <244144>; /* 8 32k periods */
> > + opp-hz = /bits/ 64 <1800000000>;
> > +
> > + opp-microvolt-speed0 = <1160000>;
> > + opp-microvolt-speed1 = <1100000>;
> > + opp-microvolt-speed2 = <1100000>;
> > + };
> > + };
> > +};
> > +
> > +&cpu0 {
> > + operating-points-v2 = <&cpu0_opp_table>;
> > + #cooling-cells = <2>;
> > +};
> > +
> > +&cpu1 {
> > + operating-points-v2 = <&cpu0_opp_table>;
> > + #cooling-cells = <2>;
> > +};
> > +
> > +&cpu2 {
> > + operating-points-v2 = <&cpu0_opp_table>;
> > + #cooling-cells = <2>;
> > +};
> > +
> > +&cpu3 {
> > + operating-points-v2 = <&cpu0_opp_table>;
> > + #cooling-cells = <2>;
> > +};
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > index e0dd0757be0b..6b7af858614a 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > @@ -253,6 +253,10 @@
> > #address-cells = <1>;
> > #size-cells = <1>;
> >
> > + speedbin_efuse: speed@1c {
> > + reg = <0x1c 0x4>;
> > + };
> > +
>
> You should order this by address, so after the THS calibration. Also,
> using a less generic node name than "speed" would be great. What about
> soc-bin ?
Indeed it's too generic.
I will keep coherency with i.MX8 and use "cpu_speed_grade"
Thanks for the review,
Clement
>
> Maxime
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