linux-kernel - Re: [PATCH v7 05/15] dt-bindings: Document the STM32 reset bindings

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Message-ID: <1430735320.3722.34.camel@pengutronix.de>
Date:	Mon, 04 May 2015 12:28:40 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Daniel Thompson <daniel.thompson@...aro.org>
Cc:	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andreas Färber <afaerber@...e.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Stefan Agner <stefan@...er.ch>,
	Peter Meerwald <pmeerw@...erw.net>,
	Paul Bolle <pebolle@...cali.nl>,
	Peter Hurley <peter@...leysoftware.com>,
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	Chanwoo Choi <cw00.choi@...sung.com>,
	Russell King <linux@....linux.org.uk>,
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	Nicolae Rosia <nicolae.rosia@...il.com>,
	Kamil Lulko <rev13@...pl>
Subject: Re: [PATCH v7 05/15] dt-bindings: Document the STM32 reset bindings

Am Samstag, den 02.05.2015, 11:01 +0100 schrieb Daniel Thompson:
> On 02/05/15 08:55, Maxime Coquelin wrote:
> > 2015-05-01 10:08 GMT+02:00 Daniel Thompson <daniel.thompson@...aro.org>:
[...]
> >> Do you intend the clock driver to use the same compatible string (given it
> >> is the same bit of hardware).
> >>
> >> If so, is it better to use st,stm32f4-rcc here? It seems unlikey to me that
> >> the register layout of the PLLs and dividers can be the same on the f7 parts
> >> (and later).
> >
> > I agree we need a compatible dedicate to f4 series for clocks, and
> > maybe even one for f429 (to be checked).
> > For the reset part, we don't have this need.
> >
> > So either we use only "st,stm32f4" as you suggest, or we can have both
> > in device tree:
> >
> > rcc: reset@...23800 {
> >      #reset-cells = <1>;
> >      compatible = "st,stm32f4-rcc", "st,stm32-rcc";
> >      reg = <0x40023800 0x400>;
> > };
> >
> > What do you think?
> 
> Having both makes sense. The reset driver probably doesn't care about 
> differences between F4 and F7 (I know very little about F7 but I can't 
> think of any obvious h/ware evolution that would confuse the current 
> reset driver).

Seconded, this is exactly the way compatible string lists are supposed
to be used.

[...]

regards
Philipp

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