linux-kernel - Re: [PATCH v2 3/7] net: rfkill: gpio: remove gpio conversion support

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Date:	Mon, 25 Nov 2013 17:47:38 +0900
From:	Alex Courbot <acourbot@...dia.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Alexandre Courbot <gnurou@...il.com>
CC:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chris Ball <cjb@...top.org>,
	Johannes Berg <johannes@...solutions.net>,
	Rhyland Klein <rklein@...dia.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Rob Landley <rob@...dley.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/7] net: rfkill: gpio: remove gpio conversion support

On 11/25/2013 05:41 PM, Heikki Krogerus wrote:
> On Sat, Nov 23, 2013 at 05:59:30PM +0900, Alexandre Courbot wrote:
>> Wouldn't it be possible (and simpler) to move patch 2 of your series
>> to first position, and then to merge patch 1 and 3 together in second
>> position? It seems to me that you are basically undoing much of the
>> work of your first patch here (notably by removing
>> rfkill_gpio_convert_to_desc() which ends up having a very short life)
>> and that this could be avoided if you defined the platform lookup
>> tables first.
>>
>> Doing so would avoid prevent you from using gpio_to_desc() which you
>> should never ever use anyway. :P
>
> Adding the lookup table in first patch and then changing the driver in
> the second creates a point to the history where this driver stops
> working on this platform, which is something I'm not willing to do.

Does it? If you just add a lookup table and keep using the integer-based 
GPIO interface, then your lookup table will not be used by anyone and 
will basically be a no-op. Then you can switch to the GPIO descriptor 
interface and take advantage of the lookup table. Unless I missed 
something there should not be any point that breaks in the git history.

(to be clear: the first patch should *only* contain the lookup table, 
and the second be a merge of the current patches 1 and 3 of this series.)

> But, we can make one patch out of all three if everybody is OK with
> that.

IIUC platform changes should be distinct from drivers whenever possible, 
so this is probably not the best choice here.

Alex.

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