diff mbox series

[v2,2/6] mmc: core: allow to match the device tree to apply quirks

Message ID 9e68e3d23e62a78527aabc1281f89e15200c7d09.1636564631.git.hns@goldelico.com
State Superseded
Headers show
Series mmc: core: extend mmc_fixup_device and transplant ti,wl1251 quirks from to be retired omap_hsmmc | expand

Commit Message

H. Nikolaus Schaller Nov. 10, 2021, 5:17 p.m. UTC 
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 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>
---
 drivers/mmc/core/card.h   |  3 +++
 drivers/mmc/core/quirks.h | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index 7bd392d55cfa5..483e7f2f1039e 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 *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..4a767f2fbaaaa 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 +146,19 @@  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);