linux-kernel - Re: [PATCH v2] gpio: keystone: add dsp gpio controller driver

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Date:	Mon, 11 Aug 2014 19:06:45 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Santosh Shilimkar <santosh.shilimkar@...com>,
	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>,
	Varka Bhadram <varkabhadram@...il.com>
Subject: Re: [PATCH v2] gpio: keystone: add dsp gpio controller driver

Hi Linus,

On 08/08/2014 03:53 PM, Linus Walleij wrote:
> On Wed, Jul 23, 2014 at 4:44 PM, Grygorii Strashko
> <grygorii.strashko@...com> wrote:
> 
>> From: Murali Karicheri <m-karicheri2@...com>
>>
>> On Keystone SOCs, ARM host can send interrupts to DSP cores using the
>> DSP GPIO controller IP. Each DSP GPIO controller provides 28 IRQ signals for
>> each DSP core. This is one of the component used by the IPC mechanism used
>> on Keystone SOCs.
>>
>> Keystone 2 DSP GPIO controller has specific features:
>> - each GPIO can be configured only as output pin;
>> - setting GPIO value to 1 causes IRQ generation on target DSP core;
>> - reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still
>>    pending.
>>
>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>> Changes in v2:
>> - minor comments applied
> 
> Hm so there was one major comment, quoting myself:
> 
> "And if you proceed with this, please integrate it with
> drivers/gpio/gpio-syscon.c, I don't need more special
> syscons GPIO handlers."
> 
> Maybe you missed this in the midst of the other discussions
> about whether this is GPIO at all, but that comment still
> stands even if you talk me down on the generality of this
> driver.
> 

There is some misunderstanding, sorry. 
And I've not missed your Major comment.

I posted v2 after a week after v1, but, unfortunately, right
before discussion on v1 had been actually started :(


>> +++ b/Documentation/devicetree/bindings/gpio/gpio-keystone.txt
> 
> Make this follow the style in:
> Documentation/devicetree/bindings/gpio/cirrus,clps711x-mctrl-gpio.txt
> 

Regards,
-grygorii

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