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Message-ID: <trinity-888f5bdb-1e23-4b5f-83c3-f36ade039908-1732719986576@trinity-msg-rest-gmx-gmx-live-5cd5dd5458-8s6ml>
Date: Wed, 27 Nov 2024 15:06:26 +0000
From: Frank Wunderlich <frank-w@...lic-files.de>
To: angelogioacchino.delregno@...labora.com, linux@...web.de,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
matthias.bgg@...il.com
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Aw: Re: [RFC v1 14/14] arm64: dts: mediatek: mt7988: add
operating-points
> Gesendet: Mittwoch, 27. November 2024 um 14:34
> Von: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>
> An: "Frank Wunderlich" <linux@...web.de>, "Rob Herring" <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>, "Matthias Brugger" <matthias.bgg@...il.com>
> CC: "Frank Wunderlich" <frank-w@...lic-files.de>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
> Betreff: Re: [RFC v1 14/14] arm64: dts: mediatek: mt7988: add operating-points
>
> Il 29/10/24 11:39, Frank Wunderlich ha scritto:
> > From: Frank Wunderlich <frank-w@...lic-files.de>
> >
> > Add operating points defining frequency/voltages of cpu cores.
> >
> > Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> > ---
> > arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 45 +++++++++++++++++++++--
> > 1 file changed, 41 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> > index e037854666c1..25669d498617 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> > @@ -16,32 +16,69 @@ cpus {
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > - cpu@0 {
> > + cpu0: cpu@0 {
>
> Where are those cpuX labels used? I don't see any usage.
these are used in later patch and needed in uboot when we want to switch to OF_UPSTREAM.
> > compatible = "arm,cortex-a73";
> > reg = <0x0>;
> > device_type = "cpu";
> > enable-method = "psci";
> > + clocks = <&mcusys CLK_MCU_ARM_DIV_SEL>,
> > + <&topckgen CLK_TOP_XTAL>;
> > + clock-names = "cpu", "intermediate";
> > + operating-points-v2 = <&cluster0_opp>;
> > };
> >
> > - cpu@1 {
> > + cpu1: cpu@1 {
> > compatible = "arm,cortex-a73";
> > reg = <0x1>;
> > device_type = "cpu";
> > enable-method = "psci";
> > + clocks = <&mcusys CLK_MCU_ARM_DIV_SEL>,
> > + <&topckgen CLK_TOP_XTAL>;
> > + clock-names = "cpu", "intermediate";
> > + operating-points-v2 = <&cluster0_opp>;
> > };
> >
> > - cpu@2 {
> > + cpu2: cpu@2 {
> > compatible = "arm,cortex-a73";
> > reg = <0x2>;
> > device_type = "cpu";
> > enable-method = "psci";
> > + clocks = <&mcusys CLK_MCU_ARM_DIV_SEL>,
> > + <&topckgen CLK_TOP_XTAL>;
> > + clock-names = "cpu", "intermediate";
> > + operating-points-v2 = <&cluster0_opp>;
> > };
> >
> > - cpu@3 {
> > + cpu3: cpu@3 {
> > compatible = "arm,cortex-a73";
> > reg = <0x3>;
> > device_type = "cpu";
> > enable-method = "psci";
> > + clocks = <&mcusys CLK_MCU_ARM_DIV_SEL>,
> > + <&topckgen CLK_TOP_XTAL>;
> > + clock-names = "cpu", "intermediate";
> > + operating-points-v2 = <&cluster0_opp>;
> > + };
> > +
> > + cluster0_opp: opp-table-0 {
> > + compatible = "operating-points-v2";
> > + opp-shared;
> > + opp00 {
>
> ...But you can also be consistent with other devicetrees and follow the pattern
> for the node names of the OPP entries.
>
> opp-800000000
> opp-1100000000
> ...etc
ok, will change this..so just adding the opp-hz value to the name (or label)?
> Cheers,
> Angelo
>
> > + opp-hz = /bits/ 64 <800000000>;
> > + opp-microvolt = <850000>;
> > + };
> > + opp01 {
> > + opp-hz = /bits/ 64 <1100000000>;
> > + opp-microvolt = <850000>;
> > + };
> > + opp02 {
> > + opp-hz = /bits/ 64 <1500000000>;
> > + opp-microvolt = <850000>;
> > + };
> > + opp03 {
> > + opp-hz = /bits/ 64 <1800000000>;
> > + opp-microvolt = <900000>;
> > + };
> > };
> > };
> >
>
>
> </frank-w@...lic-files.de></frank-w@...lic-files.de></frank-w@...lic-files.de></matthias.bgg@...il.com></conor+dt@...nel.org></krzk+dt@...nel.org></robh@...nel.org></linux@...web.de></angelogioacchino.delregno@...labora.com>
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