linux-kernel - Re: [PATCH v1] gpio: keystone: add dsp gpio controller driver

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Date:	Thu, 24 Jul 2014 10:21:27 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Grygorii Strashko <grygorii.strashko@...com>,
	Suman Anna <s-anna@...com>,
	Jaswinder Singh <jaswinder.singh@...aro.org>,
	Alexander Shiyan <shc_work@...l.ru>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	<ivan.khoronzhuk@...com>,
	Muralidharan Karicheri <m-karicheri2@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] gpio: keystone: add dsp gpio controller driver

On Thursday 24 July 2014 10:12 AM, Linus Walleij wrote:
> On Wed, Jul 23, 2014 at 5:25 PM, Santosh Shilimkar
> <santosh.shilimkar@...com> wrote:
> 
>> I will try to answer this. This IP is indeed a GPIO block
>> but the IO's are used just OUTPUT lines from Linux
>> HOST perspective. These IOs are connected to the DSPs
>> as input/IRQ lines.
> 
> So the DSP is another discrete IC, and could be something
> different, so this is board-level information?
> 
> I'm really worrying whether this is general purpose or not :-/
> 
Am not sure I follow you. This IP is completely controlled
by Linux OS to generate output signals. How does it matter
whether its connected to a peripheral or a discrete IC. For
example instead of DSP if I connected these lines to an
external PMIC, which considers these as input lines to
perform some actions. Isn't that GPIO usecase as per you ?
Given that this IP only output functionality is used but
that shouldn't matter. We have seen SOCs where GPIOs
are just used as input to form a Matrix Keyboard.

May be I am missing your point.

Regards,
Santosh



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