linux-kernel - Re: [PATCH v2 1/9] dmaengine: st_fdma: Add STMicroelectronics FDMA DT binding documentation

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Date:	Sat, 12 Sep 2015 13:07:52 +0100
From:	Peter Griffin <peter.griffin@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	srinivas.kandagatla@...il.com, maxime.coquelin@...com,
	patrice.chotard@...com, vinod.koul@...el.com,
	devicetree@...r.kernel.org, robh+dt@...nel.org,
	dmaengine@...r.kernel.org, lee.jones@...aro.org,
	Ludovic Barre <ludovic.barre@...com>
Subject: Re: [PATCH v2 1/9] dmaengine: st_fdma: Add STMicroelectronics FDMA
 DT binding documentation

Hi Arnd,

On Fri, 11 Sep 2015, Arnd Bergmann wrote:

> On Friday 11 September 2015 15:14:23 Peter Griffin wrote:
> > +- st,fdma-id	: Must contain fdma controller number
> 
> What for?

It is used by the driver to generate a unique firmware name.
Basically we need to know which controller instance we
are as each controller has a different firmware which needs
to be loaded.

Rob did say that having a index type property is undesirable
over here, see my reply at the bottom
http://www.spinics.net/lists/devicetree/msg92529.html.

However I can't think of any other useful properties we could add
to derive this information.

> > +Example:
> > +
> > +	fdma1: fdma-app@...0000 {
> 
> The name should be "dma-controller", not "fdma-app".

Ok will fix in v3

> 
> > +Example:
> > +
> > +	snd_uni_player2: snd-uni-player@2 {
> > +		compatible = "st,snd_uni_player";
> 
> Maybe change the compatible string to "st,snd-uni-player"?

Just checking the upstream driver which got merged for v4.3
and the compatible has changed to "st,sti-uni-player" so I
can update the DT doc example to use this in v3.

> 
> The string you use here would not be acceptable for a binding.

Presumably it is the use of "underscores" in the compatible which
is not allowed? Is that correct?

regards,

Peter.

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