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

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Message-ID: <20130409164101.GA20001@roeck-us.net>
Date:	Tue, 9 Apr 2013 09:41:01 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Linus Walleij <linus.walleij@...aro.org>
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 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.

Thanks,
Guenter

> drivers/gpio/gpio-generic.c
> <linux/basic_mmio_gpio.h>
> 
> See for example:
> gpio-ep93xx.c, gpio-sodaville.c ...
> 
> Since you don't even have IRQ support in this it will be even simpler.
> 
> Yours,
> Linus Walleij
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