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SubjectRe: [RFC PATCH 2/2] mmc: allow to match the device tree to apply quirks
On Thu, 14 Oct 2021 at 16:30, Jerome Pouiller
<Jerome.Pouiller@silabs.com> wrote:
>
> From: Jérôme Pouiller <jerome.pouiller@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@silabs.com>
> ---
> 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 7bd392d55cfa..2f73f8567e14 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;

const char is probably sufficient.

> +
> 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 c7ef2d14b359..ef368386e711 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++) {

We need to iterate up '8', to cover all functional devices.

The function numbers are from 1->7, while we use '0' for the
"mmc-card" compatible.

> + of_node = mmc_of_find_child_device(card->host, i);
> + if (of_node && of_device_compatible_match(of_node, compat_list))
> + return true;
> + }

Another option, which would avoid doing the iteration over and over
again in mmc_of_find_child_device(), would be to simply do the parsing
of the compatible in the child nodes, right here. In other words, just
use for_each_child_of_node().

> + 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 != NULL &&
> + !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);

Kind regards
Uffe

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