[PATCH v2] ARM: imx: Fix the removal of CONFIG_SPI option

[Uwe Kleine-König]

Hello,

On Tue, Nov 04, 2014 at 05:55:31PM +0200, Antti Palosaari wrote:
> On 11/04/2014 05:26 PM, Uwe Kleine-König wrote:
> >[Note, this is a resend of a mail I accidently only sent to Fabio
> >before.]
> >
> >Hello,
> >
> >On Tue, Nov 04, 2014 at 08:28:47AM -0200, Fabio Estevam wrote:
> >>From: Fabio Estevam <fabio.estevam at freescale.com>
> >>
> >>Since 64546e9fe3a5b8c ("ARM: imx_v6_v7_defconfig updates") and commit
> >>0650f855d2e4b0b9 ("ARM: imx_v4_v5_defconfig: Select CONFIG_IMX_WEIM") CONFIG_SPI
> >>selection was dropped by savedefconfig for imx_v4_v5_defconfig and
> >>imx_v6_v7_defconfig.
> >>
> >>In order to keep the same behaviour as previous kernel versions and avoid
> >>regressions, let's add CONFIG_SPI option back.
> >>
> >>Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> >>---
> >>Changes since v1:
> >>- Add commit id's that caused the issue.
> >on top of 64546e9fe3a5b8c doing
> >
> >         make imx_v6_v7_defconfig
> >
> >resulted in CONFIG_SPI=y. That's because MEDIA_SUBDRV_AUTOSELECT selects
> >SPI and has default y.
> >
> >So the commit that really broke imx_v6_v7_defconfig is 7d24c514e8e0
> >([media] Kconfig: do not select SPI bus on sub-driver auto-select).
> >On a side note I wonder how that commit sneaked into v3.17-rc6.
> >
> >I think people need to be more aware of the results of Kconfig changes
> 
> I added that SPI select patch for 3.17-rc1 and it was removed right
> after I got bug report it should not be there. But there was of
> course some delay and removal patch went to 3.17-rc6.
Still I think that -rc6 is quite late for such a patch. But obviously
I'm not the relevant maintainer here and YMMV.

> But all in all, it was all happening during 3.17 period and I wonder
> how it could affect you?
Commit 64546e9fe3a5 was based on v3.17-rc3 and so had the "select SPI".
That's why savedefconfig removed CONFIG_SPI=y from the minimized config.

Dropping the select for -rc6 resulted in imx_v6_v7_defconfig not
including CONFIG_SPI any more.

I checked all commits listed by:

	git log --oneline linus/master ^e4462ffc1602 -SCONFIG_SPI

and the two imx defconfigs are the only ones being affected by this
issue.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |