LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Trent Piepho <tpiepho@freescale.com>
To: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
	Richard Purdie <rpurdie@rpsys.net>,
	Sean MacLennan <smaclennan@pikatech.com>,
	Wolfram Sang <w.sang@pengutronix.de>,
	Grant Likely <grant.likely@secretlab.ca>
Subject: Re: [PATCH 1/4] of_gpio: Return GPIO flags from of_get_gpio()A
Date: Wed, 29 Oct 2008 19:21:24 -0700 (PDT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0810291857110.25957@t2.domain.actdsltmp> (raw)
In-Reply-To: <20081028143933.GA18453@oksana.dev.rtsoft.ru>

On Tue, 28 Oct 2008, Anton Vorontsov wrote:
> On Fri, Oct 24, 2008 at 04:08:58PM -0700, Trent Piepho wrote:
>> + * @flags:	if non-NUll flags are returned here
>
> NULL, not NUll.

Thanks, fixed.

>> +			 const void *gpio_spec, unsigned int *flags)
>
> Why you made it unsigned int? In my original patch, I used
> named enum, which is self-documenting type.

I started writing this patch before you posted yours, and I didn't think of
the enum.  But you have a good point so I'll switch to an enum.

>> + * Flags as returned by OF GPIO chip's xlate function.
>> + * These do not need to be the same as the flags in the GPIO specifier in the
>> + * OF device tree, but it's convenient if they are.  The mm chip OF GPIO
>> + * driver works this way.
>
> This is not of_mm_gpio_chip specific.

of_mm_gpio_chip was just an example of a driver that uses the same flag format
for Linux and the OF binding.  I'll clarify the comment.

WRT changing the interface, Linux doesn't provide a stable kernel API. 
Functions that have been around far longer than of_get_gpio() and have far
more users have changed.  Yes, it is slightly annoying now.  But providing
backward compatibility for every single interface change will produce a
bloated and redundant API that will be around forever.

> Can you repost a fixed version with my Ack and Cc: Andrew Morton,
> Benjamin Herrenschmidt?
>
> I think this change should go into the 2.6.28, so that we can
> write new code on top of new API. Otherwise this change will cause
> issues in the next merge window.

If you can get your patch into Ben's -next tree before the high .28-RCs come
out, I can just rebase my patch to that tree and make the changes to any new
callers of of_get_gpio() that are there.

  parent reply	other threads:[~2008-10-30  2:26 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-24 23:04 OpenFirmware GPIO LED driver Trent Piepho
2008-10-24 23:08 ` [PATCH 1/4] of_gpio: Return GPIO flags from of_get_gpio() Trent Piepho
2008-10-24 23:32   ` Grant Likely
2008-10-28 14:39   ` Anton Vorontsov
2008-10-28 14:53     ` Grant Likely
2008-10-28 15:16       ` Anton Vorontsov
2008-10-28 15:42         ` Grant Likely
2008-10-28 16:56           ` Anton Vorontsov
2008-10-28 17:40             ` Grant Likely
2008-10-30  2:21     ` Trent Piepho [this message]
2008-10-30 11:15       ` [PATCH 1/4] of_gpio: Return GPIO flags from of_get_gpio()A Anton Vorontsov
2008-10-31  2:03         ` [PATCH v2] of_gpio: Return GPIO flags from of_get_gpio() Trent Piepho
2008-11-26 16:20           ` Anton Vorontsov
2008-11-26 21:38             ` Paul Mackerras
2008-11-26 22:31               ` Anton Vorontsov
2008-11-26 22:35               ` Trent Piepho
2008-11-26 22:58                 ` Anton Vorontsov
2008-11-26 23:32                 ` Paul Mackerras
2008-10-24 23:08 ` [PATCH 2/4] leds: Support OpenFirmware led bindings Trent Piepho
2008-10-24 23:50   ` Grant Likely
2008-10-24 23:09 ` [PATCH 3/4] leds: Add option to have GPIO LEDs start on Trent Piepho
2008-10-24 23:59   ` Grant Likely
2008-10-24 23:09 ` [PATCH 4/4] leds: Let GPIO LEDs keep their current state Trent Piepho
2008-10-25  0:04   ` Grant Likely
2008-11-17 14:50   ` Richard Purdie
2008-11-21  1:05     ` Trent Piepho
2008-11-23 12:31       ` Pavel Machek
2008-12-03 10:04         ` Richard Purdie
2008-12-10  4:33           ` Trent Piepho

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Pine.LNX.4.64.0810291857110.25957@t2.domain.actdsltmp \
    --to=tpiepho@freescale.com \
    --cc=avorontsov@ru.mvista.com \
    --cc=grant.likely@secretlab.ca \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@ozlabs.org \
    --cc=rpurdie@rpsys.net \
    --cc=smaclennan@pikatech.com \
    --cc=w.sang@pengutronix.de \
    --subject='Re: [PATCH 1/4] of_gpio: Return GPIO flags from of_get_gpio()A' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).