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From: Krzysztof Kozlowski <krzk@kernel.org>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Anson Huang <Anson.Huang@nxp.com>,
	Andreas Kemnade <andreas@kemnade.info>,
	Stefan Riedmueller <s.riedmueller@phytec.de>,
	Robert Jones <rjones@gateworks.com>, Li Yang <leoyang.li@nxp.com>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 08/12] ARM: dts: imx6dl-pico: fix board compatibles
Date: Thu, 1 Oct 2020 09:32:08 +0200	[thread overview]
Message-ID: <20201001073208.GA5208@kozik-lap> (raw)
In-Reply-To: <0a0afea6-8cbb-3e89-5a4f-89660c942ca3@pengutronix.de>

On Thu, Oct 01, 2020 at 09:22:03AM +0200, Ahmad Fatoum wrote:
> Hello Krzysztof,
> 
> On 9/30/20 9:01 PM, Krzysztof Kozlowski wrote:
> > There are four flavors of TechNexion PICO-IMX6 boards.  They have their
> > own DTSes, even though in Dwarf, Nymph and Pi are exactly the same.
> > They also have their own bindings so adjust the compatibles to match the
> > bindings.
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > 
> > ---
> > 
> > Changes since v1:
> > 1. None
> > ---
> >  arch/arm/boot/dts/imx6dl-pico-dwarf.dts  | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-hobbit.dts | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-nymph.dts  | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-pi.dts     | 2 +-
> >  4 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-dwarf.dts b/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > index 659a8e8714ea..d85b15a8c127 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Dwarf baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-dwarf", "fsl,imx6dl";
> 
> Could you change this to have all three compatibles ("technexion,imx6dl-pico-dwarf", "technexion,imx6dl-pico",
> "fsl,imx6dl") and likewise for the other files? 
> That way other firmware that reuses the Linux device tree files and match against the SoM compatible
> continues to work after update.
> 
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-hobbit.dts b/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > index d7403c5c4337..08fedcbcc91b 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Hobbit baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-hobbit", "fsl,imx6dl";
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-nymph.dts b/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > index b282dbf953aa..32ccfc5d41ce 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Nymph baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-nymph", "fsl,imx6dl";
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-pi.dts b/arch/arm/boot/dts/imx6dl-pico-pi.dts
> > index b7b1c07f96f3..4590e8ad9a91 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-pi.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-pi.dts

The bindings, added in commit 53b61224ca40 ("dt-bindings: arm: fsl: Add
TechNexion boards"), describe that these are the only valid compatibles.
"technexion,imx6dl-pico" is not valid and would require changing the
bindings, thus breaking compatibility which you want to avoid.

The bindings, not what is present in DTS, is considered ABI.

Best regards,
Krzysztof

WARNING: multiple messages have this Message-ID
From: Krzysztof Kozlowski <krzk@kernel.org>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: devicetree@vger.kernel.org, Robert Jones <rjones@gateworks.com>,
	Stefan Riedmueller <s.riedmueller@phytec.de>,
	Anson Huang <Anson.Huang@nxp.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-kernel@vger.kernel.org, Li Yang <leoyang.li@nxp.com>,
	Rob Herring <robh+dt@kernel.org>,
	NXP Linux Team <linux-imx@nxp.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Andreas Kemnade <andreas@kemnade.info>,
	Fabio Estevam <festevam@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 08/12] ARM: dts: imx6dl-pico: fix board compatibles
Date: Thu, 1 Oct 2020 09:32:08 +0200	[thread overview]
Message-ID: <20201001073208.GA5208@kozik-lap> (raw)
In-Reply-To: <0a0afea6-8cbb-3e89-5a4f-89660c942ca3@pengutronix.de>

On Thu, Oct 01, 2020 at 09:22:03AM +0200, Ahmad Fatoum wrote:
> Hello Krzysztof,
> 
> On 9/30/20 9:01 PM, Krzysztof Kozlowski wrote:
> > There are four flavors of TechNexion PICO-IMX6 boards.  They have their
> > own DTSes, even though in Dwarf, Nymph and Pi are exactly the same.
> > They also have their own bindings so adjust the compatibles to match the
> > bindings.
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > 
> > ---
> > 
> > Changes since v1:
> > 1. None
> > ---
> >  arch/arm/boot/dts/imx6dl-pico-dwarf.dts  | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-hobbit.dts | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-nymph.dts  | 2 +-
> >  arch/arm/boot/dts/imx6dl-pico-pi.dts     | 2 +-
> >  4 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-dwarf.dts b/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > index 659a8e8714ea..d85b15a8c127 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-dwarf.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Dwarf baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-dwarf", "fsl,imx6dl";
> 
> Could you change this to have all three compatibles ("technexion,imx6dl-pico-dwarf", "technexion,imx6dl-pico",
> "fsl,imx6dl") and likewise for the other files? 
> That way other firmware that reuses the Linux device tree files and match against the SoM compatible
> continues to work after update.
> 
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-hobbit.dts b/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > index d7403c5c4337..08fedcbcc91b 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-hobbit.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Hobbit baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-hobbit", "fsl,imx6dl";
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-nymph.dts b/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > index b282dbf953aa..32ccfc5d41ce 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-nymph.dts
> > @@ -13,5 +13,5 @@
> >  
> >  / {
> >  	model = "TechNexion PICO-IMX6 DualLite/Solo Board and Nymph baseboard";
> > -	compatible = "technexion,imx6dl-pico", "fsl,imx6dl";
> > +	compatible = "technexion,imx6dl-pico-nymph", "fsl,imx6dl";
> >  };
> > diff --git a/arch/arm/boot/dts/imx6dl-pico-pi.dts b/arch/arm/boot/dts/imx6dl-pico-pi.dts
> > index b7b1c07f96f3..4590e8ad9a91 100644
> > --- a/arch/arm/boot/dts/imx6dl-pico-pi.dts
> > +++ b/arch/arm/boot/dts/imx6dl-pico-pi.dts

The bindings, added in commit 53b61224ca40 ("dt-bindings: arm: fsl: Add
TechNexion boards"), describe that these are the only valid compatibles.
"technexion,imx6dl-pico" is not valid and would require changing the
bindings, thus breaking compatibility which you want to avoid.

The bindings, not what is present in DTS, is considered ABI.

Best regards,
Krzysztof

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-10-01  7:32 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-30 19:01 [PATCH v2 00/12] ARM: dts: imx: Board compatibles cleanup Krzysztof Kozlowski
2020-09-30 19:01 ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 01/12] dt-bindings: vendor-prefixes: add MicroSys Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-06 17:36   ` Rob Herring
2020-10-06 17:36     ` Rob Herring
2020-09-30 19:01 ` [PATCH v2 02/12] dt-bindings: vendor-prefixes: add Revotics Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-06 17:36   ` Rob Herring
2020-10-06 17:36     ` Rob Herring
2020-09-30 19:01 ` [PATCH v2 03/12] dt-bindings: arm: fsl: document i.MX25 and i.MX27 boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 04/12] dt-bindings: arm: fsl: document i.MX51 boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 05/12] dt-bindings: arm: fsl: document i.MX53 boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 06/12] dt-bindings: arm: fsl: document VF boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 07/12] dt-bindings: arm: fsl: document i.MX6DL boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:01 ` [PATCH v2 08/12] ARM: dts: imx6dl-pico: fix board compatibles Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-01  7:22   ` Ahmad Fatoum
2020-10-01  7:22     ` Ahmad Fatoum
2020-10-01  7:32     ` Krzysztof Kozlowski [this message]
2020-10-01  7:32       ` Krzysztof Kozlowski
2020-10-01 10:19       ` Ahmad Fatoum
2020-10-01 10:19         ` Ahmad Fatoum
2020-10-01 10:37         ` Krzysztof Kozlowski
2020-10-01 10:37           ` Krzysztof Kozlowski
2020-10-02  7:41           ` Ahmad Fatoum
2020-10-02  7:41             ` Ahmad Fatoum
2020-10-02  8:20             ` Krzysztof Kozlowski
2020-10-02  8:20               ` Krzysztof Kozlowski
2020-10-02  8:34               ` Ahmad Fatoum
2020-10-02  8:34                 ` Ahmad Fatoum
2020-10-02  8:41               ` Marco Felsch
2020-10-02  8:41                 ` Marco Felsch
2020-10-02 10:36                 ` Krzysztof Kozlowski
2020-10-02 10:36                   ` Krzysztof Kozlowski
2020-10-05 11:39                 ` Fabio Estevam
2020-10-05 11:39                   ` Fabio Estevam
2020-09-30 19:01 ` [PATCH v2 09/12] dt-bindings: vendor-prefixes: add ABB Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-01  3:49   ` Heiko Schocher
2020-10-01  3:49     ` Heiko Schocher
2020-10-06 17:38   ` Rob Herring
2020-10-06 17:38     ` Rob Herring
2020-09-30 19:01 ` [PATCH v2 10/12] dt-bindings: arm: fsl: document i.MX6DL Aristainetos boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-01  3:50   ` Heiko Schocher
2020-10-01  3:50     ` Heiko Schocher
2020-10-06 17:38   ` Rob Herring
2020-10-06 17:38     ` Rob Herring
2020-09-30 19:01 ` [PATCH v2 11/12] ARM: dts: imx6dl: add compatibles for " Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-10-01  3:51   ` Heiko Schocher
2020-10-01  3:51     ` Heiko Schocher
2020-09-30 19:01 ` [PATCH v2 12/12] dt-bindings: arm: fsl: document i.MX6Q boards Krzysztof Kozlowski
2020-09-30 19:01   ` Krzysztof Kozlowski
2020-09-30 19:04   ` Krzysztof Kozlowski
2020-09-30 19:04     ` Krzysztof Kozlowski
2020-10-30  6:51 ` [PATCH v2 00/12] ARM: dts: imx: Board compatibles cleanup Shawn Guo
2020-10-30  6:51   ` Shawn Guo

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