linux-kernel - [PATCH 1/3] mmc: host: add slot argument to mmc_of

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Date:	Fri, 23 May 2014 19:25:19 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	linux-mmc@...r.kernel.org
Cc:	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Jaehoon Chung <jh80.chung@...sung.com>
Subject: [PATCH 1/3] mmc: host: add slot argument to mmc_of_parse

From: Ludovic Desroches <ludovic.desroches@...el.com>

Some hosts manage several slots. In these case information such as the
bus width, chi detect and others are into the slot node. So we have to
parse child node. If not NULL, slot node will be used instead of the
device node.

Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
---
 drivers/mmc/core/host.c  |   13 +++++++++----
 include/linux/mmc/host.h |   10 +++++++++-
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 95cceae..0f677b3 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -298,15 +298,17 @@ static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
 #endif
 
 /**
- *	mmc_of_parse() - parse host's device-tree node
+ *	__mmc_of_parse() - parse host's device-tree node
  *	@host: host whose node should be parsed.
+ *	@slot : some device provide several slots so the node to parse
+ *		is not the host one.
  *
  * To keep the rest of the MMC subsystem unaware of whether DT has been
  * used to to instantiate and configure this host instance or not, we
  * parse the properties and set respective generic mmc-host flags and
  * parameters.
  */
-int mmc_of_parse(struct mmc_host *host)
+int __mmc_of_parse(struct mmc_host *host, struct device_node *slot)
 {
 	struct device_node *np;
 	u32 bus_width;
@@ -317,7 +319,10 @@ int mmc_of_parse(struct mmc_host *host)
 	if (!host->parent || !host->parent->of_node)
 		return 0;
 
-	np = host->parent->of_node;
+	if (slot)
+		np = slot;
+	else
+		np = host->parent->of_node;
 
 	/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
 	if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
@@ -459,7 +464,7 @@ out:
 	return ret;
 }
 
-EXPORT_SYMBOL(mmc_of_parse);
+EXPORT_SYMBOL(__mmc_of_parse);
 
 /**
  *	mmc_alloc_host - initialise the per-host structure.
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7960424..c62af91 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -372,7 +372,15 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *);
 int mmc_add_host(struct mmc_host *);
 void mmc_remove_host(struct mmc_host *);
 void mmc_free_host(struct mmc_host *);
-int mmc_of_parse(struct mmc_host *host);
+int __mmc_of_parse(struct mmc_host *host, struct device_node *slot);
+/*
+ * mmc_of_parse - parse host's device-tree node
+ *	@host: host whose node should be parsed.
+ */
+static inline int mmc_of_parse(struct mmc_host *host)
+{
+	return __mmc_of_parse(host, NULL);
+}
 
 static inline void *mmc_priv(struct mmc_host *host)
 {
-- 
1.7.9.5

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