linux-kernel - Re: [PATCH 2/8] arm64: dts: s32g274-rd2: Enable the STM timers

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Message-ID: <aIv5hYGq+fNStRBw@lizhi-Precision-Tower-5810>
Date: Thu, 31 Jul 2025 19:17:25 -0400
From: Frank Li <Frank.li@....com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: mbrugger@...e.com, chester62515@...il.com,
	ghennadi.procopciuc@....nxp.com, shawnguo@...nel.org,
	s.hauer@...gutronix.de, s32@....com, kernel@...gutronix.de,
	festevam@...il.com, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ghennadi Procopciuc <ghennadi.procopciuc@....com>,
	Thomas Fossati <thomas.fossati@...aro.org>
Subject: Re: [PATCH 2/8] arm64: dts: s32g274-rd2: Enable the STM timers

On Wed, Jul 30, 2025 at 11:15:54PM +0200, Daniel Lezcano wrote:
> On 30/07/2025 22:21, Frank Li wrote:
> > On Wed, Jul 30, 2025 at 09:50:15PM +0200, Daniel Lezcano wrote:
> > > Enable the timers STM0 -> STM3 on the s32g274-rd2
> > >
> > > The platform has 4 CPUs and the Linux STM timer driver is per
> > > CPU. Enable 4 timers which will be used, other timers are useless for
> > > the Linux kernel and there is no benefit to enable them.
> >
> > S32 have not ARM local timer? It is quite strange!
>
> I'm not saying there is no architected timers but there are the STM. May be
> I can reword the sentence to prevent this ambiguity.

if there are local timer, why need STM for each core here?

Frank
>
> > > Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> > > Cc: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
> > > Cc: Thomas Fossati <thomas.fossati@...aro.org>
> > > ---
> > >   arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts | 16 ++++++++++++++++
> > >   1 file changed, 16 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > > index b5ba51696f43..505776d19151 100644
> > > --- a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > > +++ b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > > @@ -40,6 +40,22 @@ &uart1 {
> > >   	status = "okay";
> > >   };
> > >
> > > +&stm0 {
> > > +	status = "okay";
> > > +};
> > > +
> > > +&stm1 {
> > > +	status = "okay";
> > > +};
> > > +
> > > +&stm2 {
> > > +	status = "okay";
> > > +};
> > > +
> > > +&stm3 {
> > > +	status = "okay";
> > > +};
> > > +
> > >   &usdhc0 {
> > >   	pinctrl-names = "default", "state_100mhz", "state_200mhz";
> > >   	pinctrl-0 = <&pinctrl_usdhc0>;
> > > --
> > > 2.43.0
> > >
>
>
> --
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