mmc: core: allow to match the device tree to apply quirks

MMC subsystem provides a way to apply quirks when a device match some
properties (VID, PID, etc...) Unfortunately, some SDIO devices do 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>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/9e68e3d23e62a78527aabc1281f89e15200c7d09.1636564631.git.hns@goldelico.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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 *of_compatible;
+
 	void (*vendor_fixup)(struct mmc_card *card, int data);
 	int data;
 };

drivers/mmc/core/quirks.h

@@ -10,6 +10,7 @@
  *
  */
 
+#include <linux/of.h>
 #include <linux/mmc/sdio_ids.h>
 
 #include "card.h"
@@ -145,6 +146,19 @@ 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 *compatible)
+{
+	struct device_node *np;
+
+	for_each_child_of_node(mmc_dev(card->host)->of_node, np) {
+		if (of_device_is_compatible(np, compatible))
+			return true;
+	}
+
+	return false;
+}
+
 static inline void mmc_fixup_device(struct mmc_card *card,
 				    const struct mmc_fixup *table)
 {
@@ -173,6 +187,9 @@ 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);