[Letux-kernel] [RFC v4 2/6] mmc: core: allow to match the device tree to apply quirks

Jérôme Pouiller jerome.pouiller at silabs.com
Mon Nov 8 16:34:30 CET 2021


On Monday 8 November 2021 16:00:02 CET Ulf Hansson wrote:
> On Sat, 6 Nov 2021 at 15:31, H. Nikolaus Schaller <hns at goldelico.com> wrote:
> >
> > Hi Jérôme,
> >
> > > Am 05.11.2021 um 15:27 schrieb Jérôme Pouiller <jerome.pouiller at silabs.com>:
> > >
> > > On Friday 5 November 2021 10:05:47 CET H. Nikolaus Schaller wrote:
> > >> From: Jérôme Pouiller <jerome.pouiller at silabs.com>
> > >>
> > >> MMC subsystem provides a way to apply quirks when a device match some
> > >> properties (VID, PID, etc...) Unfortunately, some SDIO devices does not
> > >> comply with the SDIO specification and does not provide reliable VID/PID
> > >> (eg. Silabs WF200).
> > >>
> > >> So, the drivers for these devices rely on device tree to identify the
> > >> device.
> > >>
> > >> This patch allows the MMC to also rely on the device tree to apply a
> > >> quirk.
> > >>
> > >> Signed-off-by: Jérôme Pouiller <jerome.pouiller at silabs.com>

[...]

> > >> ---
> > >> drivers/mmc/core/card.h   |  3 +++
> > >> drivers/mmc/core/quirks.h | 17 +++++++++++++++++
> > >> 2 files changed, 20 insertions(+)
> > >>
> > >> +static inline bool mmc_fixup_of_compatible_match(struct mmc_card *card,
> > >> +                                                const char *const *compat_list)
> 
> After a second thought, I am not sure we really need a list of
> compatibles here. The quirks we may want to apply should be specific
> per device and most likely not shared among a family of devices, don't
> you think?

Indeed. I dislike to have to declare a list of compatible device (see 
wl1251_compatible_list in patch 5) outside of the fixup list.

If I have several devices, I prefer to copy-paste a few lines in the 
mmc_fixup list (for the WFX driver, I have 4 devices to declare).

-- 
Jérôme Pouiller




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