linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jerome Pouiller <Jerome.Pouiller@silabs.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-wireless@vger.kernel.org,
	"Kalle Valo" <kvalo@codeaurora.org>,
	"Jérôme Pouiller" <jerome.pouiller@silabs.com>
Subject: [RFC PATCH 2/2] mmc: allow to match the device tree to apply quirks
Date: Thu, 14 Oct 2021 16:30:31 +0200	[thread overview]
Message-ID: <20211014143031.1313783-3-Jerome.Pouiller@silabs.com> (raw)
In-Reply-To: <20211014143031.1313783-1-Jerome.Pouiller@silabs.com>

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;
+
 	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++) {
+		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 != 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);
-- 
2.33.0


  parent reply	other threads:[~2021-10-14 14:31 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-14 14:30 [RFC PATCH 0/2] mmc: allow to rely on the DT " Jerome Pouiller
2021-10-14 14:30 ` [RFC PATCH 1/2] mmc: rewrite mmc_fixup_device() Jerome Pouiller
2021-10-14 14:30 ` Jerome Pouiller [this message]
2021-10-20 14:29   ` [RFC PATCH 2/2] mmc: allow to match the device tree to apply quirks Ulf Hansson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211014143031.1313783-3-Jerome.Pouiller@silabs.com \
    --to=jerome.pouiller@silabs.com \
    --cc=kvalo@codeaurora.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=ulf.hansson@linaro.org \
    --subject='Re: [RFC PATCH 2/2] mmc: allow to match the device tree to apply quirks' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).