linux-kernel - Re: [PATCH 1/2] mmc: hsmmc: Add reset gpio configuration option.

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Date:	Sat, 26 Jul 2014 21:48:38 +0200
From:	Belisko Marek <marek.belisko@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Olof Johansson <olof@...om.net>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>, balajitk@...com,
	chris@...ntf.net, Ulf Hansson <ulf.hansson@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-mmc@...r.kernel.org,
	"Dr. H. Nikolaus Schaller" <hns@...delico.com>,
	NeilBrown <neilb@...e.de>
Subject: Re: [PATCH 1/2] mmc: hsmmc: Add reset gpio configuration option.

Hi Russel,

On Fri, Jul 4, 2014 at 1:01 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Thu, Jul 03, 2014 at 10:49:23PM +0200, Marek Belisko wrote:
>> From: NeilBrown <neilb@...e.de>
>>
>> If a 'gpio_reset' is specified, then hold it low while
>> turning the power regulator on.
>> This is needed for some wi2wi wireless modules, particularly
>> when the regulator is held active by some other client.
>> The wi2wi needs to be reset if power isn't actually removed, and
>> the gpio can be used to do this.
>>
>> Signed-off-by: NeilBrown <neilb@...e.de>
>
> Obvious statement knowing what's been going on elsewhere...
>
> A while back, Olof produced a couple of patches to add /generic/ support
> to deal with power and reset controls for SDIO WIFI cards.  Patches
> were posted to linux-arm-kernel and other places around January time
> this year.
>
> No real conclusion came out of it, and it kind of died.  The point here
> is that this is not an OMAP problem.  We have this very same problem
> on different platforms and different SoCs.
Thanks for pointing me to Olof's patches. I pick first + update secod
for omap_hcmmc.
I use only card-reset-gios property and it works fine. As you stated
it's kind of died discussion?
Sorry for noise and not using more googling on linux-arm ML.
>
> Why should we have N different solutions to the same problem.  Why can't
> we have one solution to fix this issue, rather than having every host
> driver implement some different solution to what's a common problem.
>
> If everyone is going to run away from generic problems and continue
> inventing their own private solutions to generic problems, the kernel
> is just going to become severely bloated and unmaintainable...
>
> Please, sort out generic problems with generic solutions.
>
> --
> FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly
> improving, and getting towards what was expected from it.

BR,

marek

-- 
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