linux-kernel - Re: [PATCH 2/4] gpiolib: use const parameters when possible

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Message-ID: <CAAVeFuJ8=PdV8oiazVVcyrO3Kx4mV6GphxHCGEGX9ooMuoBWtA@mail.gmail.com>
Date:	Tue, 25 Nov 2014 16:37:57 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Janusz Uzycki <j.uzycki@...roma.com.pl>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 2/4] gpiolib: use const parameters when possible

On Wed, Nov 19, 2014 at 7:09 PM, Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
> Hello Alexandre,
>
> On Wed, Nov 19, 2014 at 06:07:50PM +0900, Alexandre Courbot wrote:
>>  On Wed, Nov 19, 2014 at 6:02 PM, Uwe Kleine-König
>> <u.kleine-koenig@...gutronix.de> wrote:
>> > I'd make gpiod_get_direction static and only use it to fill in
>> > /sys/kernel/debug/gpio.
>>
>> That's very tempting. I see only atmel_serial.c using this function,
>> and there is no gpio_get_direction() declared anywhere so no user of
>> this either. I'm not sure what I was thinking when I decided to export
>> it?
> In next there is also drivers/tty/serial/mxs-auart.c.

Ok. I think we can get rid of gpiod_get_direction() if
serial_mctrl_gpio implements its own way to query the direction (maybe
using a bitmap in the mctrl_gpios and a mctrl_gpio_get_direction()
function that queries that map). Using gpiod_get_direction() is just
too unreliable.

Janusz, since your change for mxs-auart is in -next, would you mind
amending it to do this? Then we could do the same for atmel_serial and
remove gpiod_get_direction() from the public GPIO interface. This
function would do more harm than good anyway.

Thanks!
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