linux-kernel - Re: [PATCH v1 1/2] ARM: dts: stm32: add support of stm32mp157f-dk2 board

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Message-ID:
 <PN0P287MB201936022C3BF4389C7BF8B79A64A@PN0P287MB2019.INDP287.PROD.OUTLOOK.COM>
Date: Tue, 27 May 2025 06:36:07 +0000
From: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
To: Alexandre TORGUE <alexandre.torgue@...s.st.com>,
	"amelie.delaunay@...s.st.com" <amelie.delaunay@...s.st.com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Maxime Coquelin
	<mcoquelin.stm32@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>, Marc
 Kleine-Budde <mkl@...gutronix.de>, Leonard Göhrs
	<l.goehrs@...gutronix.de>, Marek Vasut <marex@...x.de>, David Jander
	<david@...tonic.nl>, Roan van Dijk <roan@...tonic.nl>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] ARM: dts: stm32: add support of stm32mp157f-dk2
 board

Hi Alexandre,

> Hi Himanshu
> 
> On 5/24/25 12:03, Himanshu Bhavani wrote:
> > STM32MP157F is similar to the STM32MP157C, so reuse the existing
> > stm32mp157c-dk2.dts as a base for the STM32MP157F-DK2 board.
> >
> > Datasheet: https://www.st.com/resource/en/data_brief/stm32mp157f-dk2.pdf
> > Signed-off-by: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
> > ---
> >   arch/arm/boot/dts/st/Makefile            |  3 ++-
> >   arch/arm/boot/dts/st/stm32mp157f-dk2.dts | 15 +++++++++++++++
> >   2 files changed, 17 insertions(+), 1 deletion(-)
> >   create mode 100644 arch/arm/boot/dts/st/stm32mp157f-dk2.dts
> >
> > diff --git a/arch/arm/boot/dts/st/Makefile b/arch/arm/boot/dts/st/Makefile
> > index 60d55516f723..38179638e5eb 100644
> > --- a/arch/arm/boot/dts/st/Makefile
> > +++ b/arch/arm/boot/dts/st/Makefile
> > @@ -70,7 +70,8 @@ dtb-$(CONFIG_ARCH_STM32) += \
> >       stm32mp157c-lxa-tac-gen2.dtb \
> >       stm32mp157c-odyssey.dtb \
> >       stm32mp157c-osd32mp1-red.dtb \
> > -     stm32mp157c-phycore-stm32mp1-3.dtb
> > +     stm32mp157c-phycore-stm32mp1-3.dtb \
> > +     stm32mp157f-dk2.dtb
> >   dtb-$(CONFIG_ARCH_U8500) += \
> >       ste-snowball.dtb \
> >       ste-hrefprev60-stuib.dtb \
> > diff --git a/arch/arm/boot/dts/st/stm32mp157f-dk2.dts b/arch/arm/boot/dts/st/stm32mp157f-dk2.dts
> > new file mode 100644
> > index 000000000000..ab406b2c44c1
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/st/stm32mp157f-dk2.dts
> > @@ -0,0 +1,15 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
> > +/*
> > + * Copyright (C) 2025 Silicon Signals Pvt. Ltd.
> > + *
> > + * Author: Himanshu Bhavani <himanshu.bhavani@...iconsignals.io>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "stm32mp157c-dk2.dts"
> 
> In this case what is the aim of this series if you just use stm32mp157C
> devicetree ?

This patch series aims to add support for the STM32MP157F board device 
tree. The primary motivation is to ensure that users working with the 
STM32MP157F variant have a reference DTS available. Currently, no such 
device tree exists, even though the STM32MP157F and STM32MP157C are 
largely similar.

> ST people (mainly Amélie) are preparing a full support of
> STM32MP157F-DK2 leveraging the F variant compare to the C variant.
> Series will be sent this week.

If ST is working on a dedicated DTS for the F variant, it's likely they are starting 
from the C variant as a base, this is exactly the approach I’ve taken here. At this 
stage, I have not included an SCMI-based version of the board since it hasn't 
been tested yet.

Please let me know if you have any further suggestions.


Best Regards,
Himanshu

> Regards
> Alex
> 
> > +
> > +/ {
> > +     model = "STMicroelectronics STM32MP157F-DK2 Discovery Board";
> > +     compatible = "st,stm32mp157f-dk2", "st,stm32mp157";
> > +};