linux-kernel - Re: [PATCH] mmc: Add hardware dependencies for sdhci-pxav3 and sdhci-pxav2

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Date:	Wed, 28 Jan 2015 15:04:24 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Jean Delvare <jdelvare@...e.de>
Cc:	Chris Ball <chris@...ntf.net>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mmc: Add hardware dependencies for sdhci-pxav3 and sdhci-pxav2

On 27 January 2015 at 15:34, Jean Delvare <jdelvare@...e.de> wrote:
> Hi Ulf,
>
> Le Tuesday 27 January 2015 à 15:06 +0100, Ulf Hansson a écrit :
>> On 26 January 2015 at 11:23, Jean Delvare <jdelvare@...e.de> wrote:
>> > I seem to understand that the sdhci-pxav3 and sdhci-pxav2 drivers are
>> > only needed on the MMP architecture. So add a hardware dependency on
>> > ARCH_MMP, so that other users don't get to build useless drivers.
>>
>> I would rather see the default option to be N.
>> Thus those configurations that needs this driver will have to select it.
>
> This is a different question. The purpose of my patch is that people
> configuring kernels for systems which just can't have these controllers,
> are not asked about this driver at all. Changing the default to N would
> not achieve that.

For those SOC that want these drivers, they should be able to select
them from their defconfigs. So it will be an opt-in instead of opt-out
policy, which I prefer. It also follows the other Kconfig options for
mmc drivers.

Kind regards
Uffe

>
> That being said, feel free to change the default to N if you want, but
> to me (who knows nothing about MMP architecture and not much about MMC)
> the current default values look sane.
>
> Thanks,
> Jean
>
>> > Signed-off-by: Jean Delvare <jdelvare@...e.de>
>> > Cc: Chris Ball <chris@...ntf.net>
>> > Cc: Ulf Hansson <ulf.hansson@...aro.org>
>> > Cc: Eric Miao <eric.y.miao@...il.com>
>> > Acked-by: Haojian Zhuang <haojian.zhuang@...il.com>
>> > ---
>> > This patch was already sent on:
>> >  * 2014-04-23
>> >  * 2014-06-16
>> >
>> >  drivers/mmc/host/Kconfig |    2 ++
>> >  1 file changed, 2 insertions(+)
>> >
>> > --- linux-3.19-rc6.orig/drivers/mmc/host/Kconfig        2015-01-26 10:30:56.472182636 +0100
>> > +++ linux-3.19-rc6/drivers/mmc/host/Kconfig     2015-01-26 11:13:33.669863314 +0100
>> > @@ -228,6 +228,7 @@ config MMC_SDHCI_PXAV3
>> >         tristate "Marvell MMP2 SD Host Controller support (PXAV3)"
>> >         depends on CLKDEV_LOOKUP
>> >         depends on MMC_SDHCI_PLTFM
>> > +       depends on ARCH_MMP || COMPILE_TEST
>> >         default CPU_MMP2
>> >         help
>> >           This selects the Marvell(R) PXAV3 SD Host Controller.
>> > @@ -240,6 +241,7 @@ config MMC_SDHCI_PXAV2
>> >         tristate "Marvell PXA9XX SD Host Controller support (PXAV2)"
>> >         depends on CLKDEV_LOOKUP
>> >         depends on MMC_SDHCI_PLTFM
>> > +       depends on ARCH_MMP || COMPILE_TEST
>> >         default CPU_PXA910
>> >         help
>> >           This selects the Marvell(R) PXAV2 SD Host Controller.
>> >
>> >
>> > --
>> > Jean Delvare
>> > SUSE L3 Support
>
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