linux-kernel - Re: [PATCH 3/4] gpio: Kontron PLD gpio driver

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Date:	Wed, 10 Apr 2013 22:06:10 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Kevin Strasser <kevin.strasser@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michael Brunner <michael.brunner@...tron.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Ben Dooks <ben-linux@...ff.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org,
	Darren Hart <dvhart@...ux.intel.com>,
	Michael Brunner <mibru@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 3/4] gpio: Kontron PLD gpio driver

On Tue, Apr 9, 2013 at 6:41 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Tue, Apr 09, 2013 at 10:46:15AM +0200, Linus Walleij wrote:
>> On Mon, Apr 8, 2013 at 7:15 PM, Kevin Strasser
>> <kevin.strasser@...ux.intel.com> wrote:
>>
>> > From: Michael Brunner <michael.brunner@...tron.com>
>> >
>> > Add gpio support for the on-board PLD found on some Kontron embedded
>> > modules.
>> >
>> > Signed-off-by: Michael Brunner <michael.brunner@...tron.com>
>> > Signed-off-by: Kevin Strasser <kevin.strasser@...ux.intel.com>
>>
>> This looks very generic, setting and clearing bits in bytesized
>> registers.
>>
>> Can you please attempt to use generic GPIO for this?
>>
> Linus,
>
> I looked into it, but for my part I seem to be missing how the generic GPIO code
> permits locking access to the hardware (PLD) and setting the PLD's page register.
> In other words, I don't immediately see how to call kempld_get_mutex_set_index()
> from the generic GPIO code. The other drivers using generic GPIO code don't
> seem to have that requirement.

Ah yes, I was totally wrong here.

I thought it was MMIO while it is indeed through an MFD proxy.

I'll have a second look then...

Yours,
Linus Walleij
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