linux-kernel - Re: [PATCH net-next v3 1/3] dt-bindings: net: fec: add pps channel property

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Message-ID: <20240809-euphemism-degrading-f2b329ccce50@spud>
Date: Fri, 9 Aug 2024 16:10:21 +0100
From: Conor Dooley <conor@...nel.org>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Wei Fang <wei.fang@....com>, Shenwei Wang <shenwei.wang@....com>,
	Clark Wang <xiaoning.wang@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Linux Team <linux-imx@....com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	imx@...ts.linux.dev, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/3] dt-bindings: net: fec: add pps channel
 property

On Fri, Aug 09, 2024 at 04:49:14PM +0200, Francesco Dolcini wrote:
> On Fri, Aug 09, 2024 at 03:27:39PM +0100, Conor Dooley wrote:
> > On Fri, Aug 09, 2024 at 11:48:02AM +0200, Francesco Dolcini wrote:
> > > From: Francesco Dolcini <francesco.dolcini@...adex.com>
> > > 
> > > Add fsl,pps-channel property to specify to which timer instance the PPS
> > > channel is connected to.
> > 
> > In the driver patch you say "depending on the soc ... might be routed to
> > different timer instances", why is a soc-specific compatible
> > insufficient to determine which timer instance is in use?
> > I think I know what you mean, but I'm not 100%.
> > 
> > That said, the explanation in the driver patch is better than the one
> > here, so a commit message improvement is required.
> 
> This was clarified by NXP during the discussion on this series [1] and the
> commit messages were not amended to take this new information into
> account, my fault.
> 
> I would propose something like this here:
> 
> ```
> Add fsl,pps-channel property to select where to connect the PPS
> signal. This depends on the internal SoC routing and on the board, for
> example on the i.MX8 SoC it can be connected to an external pin (using
> channel 1) or to internal eDMA as DMA request (channel 0).
> ```

That's definitely better, as it illustrates why the compatible is not
sufficient.

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