linux-kernel - Re: [PATCH v3 0/4] Add support for new IMX8MP based board

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Message-ID: <vghktkih6pdjrui7sjs2gn2elfcdlplh37ahzcm2xnqin3rh4g@cck4xniyourm>
Date: Tue, 24 Sep 2024 10:22:40 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michal Vokáč <michal.vokac@...ft.com>
Cc: Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Shawn Guo <shawnguo@...nel.org>, 
	Petr Benes <petr.benes@...ft.com>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
	Herburger <gregor.herburger@...tq-group.com>, Hiago De Franco <hiago.franco@...adex.com>, 
	Hugo Villeneuve <hvilleneuve@...onoff.com>, Joao Paulo Goncalves <joao.goncalves@...adex.com>, 
	Michael Walle <mwalle@...nel.org>, Alexander Stein <alexander.stein@...tq-group.com>, 
	Mathieu Othacehe <m.othacehe@...il.com>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/4] Add support for new IMX8MP based board

On Mon, Sep 23, 2024 at 05:14:13PM +0200, Michal Vokáč wrote:
> Hi,
> 
> this series adds support for a new member in our IOTA platform.
> The board is based on the i.MX8MP SoC. The first two patches
> add support for most of the board functionality except USB Type-C
> port and some other minor things.
> 
> [PATCH 3] adds new device tree binding for a Diodes Incorporated
> PI5USB30213A Type-C Controller and [PATCH 4] enables that port on
> the IOTA2 Lumpy board.
> 
> We also wrote a driver for that Type-C port controller. I would like
> to get that driver upstream as well but I expect it will take much
> more iterations and effort to get it into mainline-ready shape so
> I intentionally excluded it from this series. AFAIK it should not
> be a problem to accept a device tree binding for a HW that does not
> have a driver in the kernel yet.

It's unusual but okay. It will be however more difficult for you - any
changes in the binding in the future (when writing driver) will be
rejected on basis of breaking ABI, even if Linux does not use that ABI.

Best regards,
Krzysztof