linux-kernel - Re: [PATCH 1/3] powerpc: Add mmc-spi-slot bindings

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Date:	Fri, 31 Oct 2008 02:28:51 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Pierre Ossman <drzeus-mmc@...eus.cx>
Subject: Re: [PATCH 1/3] powerpc: Add mmc-spi-slot bindings

On Fri, Oct 31, 2008 at 02:02:53AM +0300, Anton Vorontsov wrote:
[...]
> It's pretty trivial to implement (of_get_named_gpio() -- could be just
> factored out of of_get_gpio()).
> 
> Though,
> 
> 1. The idea is quite extreme. It needs discussion, and furthermore,
>    we need to define when do we use gpios = <> and when something-gpio =
>    <>; We need to be consistent, and to be consistent, the rules should
>    be clear and written.
> 
> 2. We should think about it very very carefully. Do we want to lose the
>    track of gpios? For example, there are quite defined rules when (and
>    in what properties) you may encounter memory addresses, when and
>    where you can encounter interrupt specifiers. We do the same for
>    gpios, and so far it works great. We need to think about any possible
>    drawbacks of the scheme you purpose (we would never know where to
>    expect gpios - it isn't a problem per se, but maybe it could lead
>    to some problem in future? I don't know.)
> 
> Quite honestly I don't like the idea... maybe I just used to
> interrupts = <>, reg = <>, ranges = <>, interrupt-map = <> and so
> forth, and now my subconsciousness tells me "it's wrong to do
> something-interrupt = <> stuff." ;-)

Btw, not that I hate this new scheme, sometimes the scheme is even
inevitable. For example when we have gpios with two or more ellipsis:
gpios = <... ...>.

But this should be a separate discussion, really.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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