linux-kernel - Re: [PATCH] pio: add arch specific gpio_is

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Date:	Tue, 7 Sep 2010 16:44:55 -0700 (PDT)
From:	David Brownell <david-b@...bell.net>
To:	Ryan Mallon <ryan@...ewatersys.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"avictor.za@...il.com" <avictor.za@...il.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, bn@...sdigital.com,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pio: add arch specific gpio_is_valid() function

--- On Tue, 9/7/10, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > 
> >      device->output_pin = -EINVAL;
> 
> gpio numbers are unsigned in the rest of the API

Minor goof; should have been "int" everywhere,
as implied by the references to negative numbers
in the docs... negatives not used internally, but
preserved for external use (as above).

> 
> It's unfortunate that 0 was used for a GPIO

Intentional:  board schematics and chip docs can
easily match up to Linux this way.  What would be
unfortunate is needing to map hardware docs into
software ones all the time -- error prone.

When the API is used correctly, it's not an issue.

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