linux-kernel - RE: [PATCH v2 3/7] arm64: dts: freescale: imx95: update a55 thermal trip points

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Message-ID:
 <PAXPR04MB8459114481B327DE1065ECF5889E2@PAXPR04MB8459.eurprd04.prod.outlook.com>
Date: Fri, 6 Sep 2024 08:19:53 +0000
From: Peng Fan <peng.fan@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
	<s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>
CC: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Peng Fan (OSS)" <peng.fan@....nxp.com>
Subject: RE: [PATCH v2 3/7] arm64: dts: freescale: imx95: update a55 thermal
 trip points

> Subject: Re: [PATCH v2 3/7] arm64: dts: freescale: imx95: update a55
> thermal trip points
> 
> Am Dienstag, 3. September 2024, 09:17:48 CEST schrieb Peng Fan
> (OSS):
> > From: Peng Fan <peng.fan@....com>
> >
> > Update the thermal trip points for automotive and extended
> industrial
> > temperature qualification processors.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx95.dtsi | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi
> > b/arch/arm64/boot/dts/freescale/imx95.dtsi
> > index 314a45e82c38..2cba7a889030 100644
> > --- a/arch/arm64/boot/dts/freescale/imx95.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx95.dtsi
> > @@ -347,13 +347,13 @@ a55-thermal {
> >
> >  			trips {
> >  				cpu_alert0: trip0 {
> > -					temperature = <85000>;
> > +					temperature = <105000>;
> >  					hysteresis = <2000>;
> >  					type = "passive";
> >  				};
> >
> >  				cpu_crit0: trip1 {
> > -					temperature = <95000>;
> > +					temperature = <125000>;
> 
> What about commercial and industrial temperature ranges? Can you
> detected this at runtime? Is the bootloader supposed to correct these
> settings?

Bootloader is supposed to update or people could overwrite in their
board device tree per which chip grade is being used.

It would be better if there is runtime update by kernel, but no as
of now. We may use nvmem to do runtime in future, but need check.

Regards,
Peng.

> 
> Best regards,
> Alexander
> 
> >  					hysteresis = <2000>;
> >  					type = "critical";
> >  				};
> >
> >
> 
> 
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