linux-kernel - Re: [PATCH V2 2/2] gpio: add STA2X11 GPIO block

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Date:	Thu, 16 Feb 2012 21:24:20 +0100
From:	Alessandro Rubini <rubini@...dd.com>
To:	linus.walleij@...aro.org
Cc:	linux-kernel@...r.kernel.org, giancarlo.asnaghi@...com,
	alan@...ux.intel.com, sameo@...ux.intel.com,
	grant.likely@...retlab.ca
Subject: Re: [PATCH V2 2/2] gpio: add STA2X11 GPIO block

Thank Linus for this and the others.

> [Nitpick: spelling]

ack

>> +       gpio->base = gpio_base;
>> +       gpio->base = 0;
> 
> What are you doing here?

An error. Sorry. the latter line must be removed. I'll resend.

> The GPIO pin number space is global and you need to be able to
> handle the case where several controllers of this kind are plugged
> in, will you not?

Yes, I'm pretty careful about this, and it's one of the concerns I
have with the code I got. Unfortunately I only have 1 card plugged in
a PC (and one standalone system where the sta2x11 is the main chipset
and no more chan be plugged).  Here I simply made a mistake.

> Make sure that the global GPIO numberspace is properly
> handled on these systems, alas I am a bit worried that this
> may not be that very easy.

No, it was not. But, despite tha extra line from earlier code, it should
work properly with this code layout.

/alessandro
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