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

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Date:	Tue, 05 May 2015 17:42:37 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:	Daniel Thompson <daniel.thompson@...aro.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andreas Färber <afaerber@...e.de>,
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	Rob Herring <robh+dt@...nel.org>,
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Subject: Re: [PATCH v7 05/15] dt-bindings: Document the STM32 reset bindings

Am Dienstag, den 05.05.2015, 17:19 +0200 schrieb Maxime Coquelin:
> >> For example, includes/dt-bindings/mfd/stm32f4-rcc.h would look like:
> >>
> >> #define GPIOA 0
> >> #define GPIOB 1
> >> ...
> >> #define LTDC 186

That looks a bit fragile.
At least the defines for the indices should be properly namespaced,
check out include/dt-bindings/gpio/tegra-gpio.h for a similar case.

> >> #define STM32F4_RESET(x) (x + 128)
> >> #define STM32F4_CLOCK(x) (x + 384)
> >>
> >> Then, in DT, a reset would be described like this:
> >>
> >> timer2 {
> >>      resets = <&rcc STM32F4_RESET(TIM2)>;
> >> };
> >>
> >> Phillip, Daniel, does that look acceptable to you?
> >
> >
> > Doesn't look unreasonable.
> >
> > I am a little uneasy simply because there are very few similar header files
> > in that directory but I haven't thought of a better idea.
> 
> Since this file will be shared by both clock and reset drivers, I
> don't see better option.
> I will implement it in v8 if Philipp agrees.

Are the device tree maintainers happy with this idiom spreading?
Except for the point above, I think this is acceptable.

regards
Philipp

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