linux-kernel - Re: [PATCH v3] gpio: better lookup method for platform GPIOs

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Message-ID: <CACRpkdbJSCWFeF=Q_pfmbDTeQwxCMazgu88r=X_onysKT8JWpg@mail.gmail.com>
Date:	Tue, 3 Dec 2013 13:12:09 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Rhyland Klein <rklein@...dia.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] gpio: better lookup method for platform GPIOs

On Tue, Dec 3, 2013 at 4:20 AM, Alexandre Courbot <acourbot@...dia.com> wrote:

> Change the format of the platform GPIO lookup tables to make them less
> confusing and improve lookup efficiency.
>
> The previous format was a single linked-list that required to compare
> the device name and function ID of every single GPIO defined for each
> lookup. Switch that to a list of per-device tables, so that the lookup
> can be done in two steps, omitting the GPIOs that are not relevant for a
> particular device.
>
> The matching rules are now defined as follows:
> - The device name must match *exactly*, and can be NULL for GPIOs not
>   assigned to a particular device,
> - If the function ID in the lookup table is NULL, the con_id argument of
>   gpiod_get() will not be used for lookup. However, if it is defined, it
>   must match exactly.
> - The index must always match.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> Changes since v2:
> - Removed size member of the gpiod_lookup_table struct (thanks Heikki!)
> - Added Andy's reviewed-by

OK looks good, however I must get my fixes stack to Torvalds
and pull -rc3 back in before I can apply this, it seems, as
it builds upon pending fixes.

Yours,
Linus Walleij
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