linux-kernel - RE: [PATCH v4 5/7] firmware: imx: Add i.MX95 SCMI LMM driver

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Message-ID:
 <PAXPR04MB84593BB91063D13BB05BEB5988B32@PAXPR04MB8459.eurprd04.prod.outlook.com>
Date: Mon, 14 Apr 2025 10:44:18 +0000
From: Peng Fan <peng.fan@....com>
To: Sudeep Holla <sudeep.holla@....com>
CC: "Peng Fan (OSS)" <peng.fan@....nxp.com>, Cristian Marussi
	<cristian.marussi@....com>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
	<s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Dan
 Carpenter <dan.carpenter@...aro.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "arm-scmi@...r.kernel.org"
	<arm-scmi@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH v4 5/7] firmware: imx: Add i.MX95 SCMI LMM driver

Hi Sudeep,

> Subject: Re: [PATCH v4 5/7] firmware: imx: Add i.MX95 SCMI LMM
> driver
> 
> On Mon, Apr 14, 2025 at 09:57:43AM +0000, Peng Fan wrote:
> > Hi Sudeep,
> >
> > > Subject: Re: [PATCH v4 5/7] firmware: imx: Add i.MX95 SCMI LMM
> > > driver
> > >
> > > On Tue, Apr 08, 2025 at 04:44:29PM +0800, Peng Fan (OSS) wrote:
> > > > From: Peng Fan <peng.fan@....com>
> > > >
> > > > The i.MX95 System manager exports SCMI LMM protocol for linux
> to
> > > > manage Logical Machines. The driver is to use the LMM Protocol
> > > > interface to boot, shutdown a LM.
> > > >
> > > > Reviewed-by: Cristian Marussi <cristian.marussi@....com>
> > > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > > ---
> > > >  drivers/firmware/arm_scmi/vendors/imx/Kconfig |  3 +-
> > > >  drivers/firmware/imx/Kconfig                  | 11 ++++
> > > >  drivers/firmware/imx/Makefile                 |  1 +
> > > >  drivers/firmware/imx/sm-lmm.c                 | 91
> > > +++++++++++++++++++++++++++
> > > >  include/linux/firmware/imx/sm.h               | 14 +++++
> > > >  5 files changed, 119 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/firmware/arm_scmi/vendors/imx/Kconfig
> > > > b/drivers/firmware/arm_scmi/vendors/imx/Kconfig
> > > > index
> > > >
> > >
> b5f13d0e40155e485f4d1696e9550645d888ef44..4c24e17425f83081
> > > 0f8ba376ece9
> > > > db93c8cded6d 100644
> > > > --- a/drivers/firmware/arm_scmi/vendors/imx/Kconfig
> > > > +++ b/drivers/firmware/arm_scmi/vendors/imx/Kconfig
> > > > @@ -26,7 +26,8 @@ config IMX_SCMI_CPU_EXT  config
> > > IMX_SCMI_LMM_EXT
> > > >  	tristate "i.MX SCMI LMM EXTENSION"
> > > >  	depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
> > > > -	default y if ARCH_MXC
> > > > +	depends on IMX_SCMI_LMM_DRV
> > > > +	default y if ARCH_MXC && ARM64
> > >
> > > I can't understand the ARM64 dependency on this and next patch.
> >
> > ARCH_MXC both supports ARM32 and ARM64.
> >
> > To i.MX ARM32 platform, there is no plan to enable SCMI, so only set
> y
> > for ARCH_MXC ARM64 platforms.
> >
> 
> OK but why is it different for IMX_SCMI_MISC_DRV. I really don't see
> any dependency. If it is not supported today fine, but do you need any
> issue to use it or compile it for arm32 ?

Seems my over-thinking.
There is no ARM64 dependency. No issue.
I just think there is no need to default build in this driver for i.MX
ARM32 platform, because no i.MX ARM32 platform supports SCMI.

But after a rethink, ARM64 dependency could be dropped, because
there was already a dependency ARM_SCMI_PROTOCOL(i.MX ARM32
not select this option), so we could follow same as
IMX_SCMI_MISC_DRV.

Please let me know if I need post new version for this and
Dan's comments. Anyway, no rush.

Thanks,
Peng.

> 
> --
> Regards,
> Sudeep