Hi jerome,
> Am 03.11.2021 um 14:24 schrieb Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>:
>
> Hi Nikolaus,
>
> On Wednesday 3 November 2021 14:00:10 CET H. Nikolaus Schaller wrote:
>> From: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
>>
>> 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@xxxxxxxxxx>
>> ---
>> drivers/mmc/core/card.h | 3 +++
>> drivers/mmc/core/quirks.h | 18 ++++++++++++++++++
>> 2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
>> index 7bd392d55cfa5..2f73f8567e14f 100644
>> --- a/drivers/mmc/core/card.h
>> +++ b/drivers/mmc/core/card.h
>> @@ -59,6 +59,9 @@ struct mmc_fixup {
>> /* for MMC cards */
>> unsigned int ext_csd_rev;
>>
>> + /* Match against functions declared in device tree */
>> + const char *const *of_compatible;
>> +
>> void (*vendor_fixup)(struct mmc_card *card, int data);
>> int data;
>> };
>> diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
>> index c7ef2d14b359f..a8b82b34dcfd2 100644
>> --- a/drivers/mmc/core/quirks.h
>> +++ b/drivers/mmc/core/quirks.h
>> @@ -10,6 +10,7 @@
>> *
>> */
>>
>> +#include <linux/of.h>
>> #include <linux/mmc/sdio_ids.h>
>>
>> #include "card.h"
>> @@ -145,6 +146,20 @@ static const struct mmc_fixup __maybe_unused sdio_fixup_methods[] = {
>> END_FIXUP
>> };
>>
>> +static inline bool mmc_fixup_of_compatible_match(struct mmc_card *card,
>> + const char *const *compat_list)
>> +{
>> + struct device_node *of_node;
>> + int i;
>> +
>> + for (i = 0; i < 7; i++) {
>> + of_node = mmc_of_find_child_device(card->host, i);
>> + if (of_node && of_device_compatible_match(of_node, compat_list))
>> + return true;
>> + }
>> + return false;
>> +}
>> +
>> static inline void mmc_fixup_device(struct mmc_card *card,
>> const struct mmc_fixup *table)
>> {
>> @@ -173,6 +188,9 @@ static inline void mmc_fixup_device(struct mmc_card *card,
>> continue;
>> if (rev < f->rev_start || rev > f->rev_end)
>> continue;
>> + if (f->of_compatible &&
>> + !mmc_fixup_of_compatible_match(card, f->of_compatible))
>> + continue;
>>
>> dev_dbg(&card->dev, "calling %ps\n", f->vendor_fixup);
>> f->vendor_fixup(card, f->data);
>> --
>> 2.33.0
>>
>>
>
> Thanks to take care of this. Do you know if the comments for Ulf[1]
> are still relevant?
>
> [1]: https://lore.kernel.org/lkml/CAPDyKFpr0kpRXoUACNNSwe8pL1S9wJPjnX+GFGS1PNezKCDYzQ@xxxxxxxxxxxxxx/
Ah yes. I think so.
Especially the comment about doing the loop over the child nodes...
I'll make a note for v4.
BR and thanks,
Nikolaus
