From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-kernel@vger.kernel.org
Cc: linux-serial@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de,
devicetree@vger.kernel.org, grant.likely@linaro.org,
rob.herring@calxeda.com, Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 1/2] OF: Add helper for matching against linux,stdout-path
Date: Mon, 5 Aug 2013 14:40:44 +0200 [thread overview]
Message-ID: <1375706445-15375-2-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1375706445-15375-1-git-send-email-s.hauer@pengutronix.de>
devicetrees may have a linux,stdout-path property in the chosen
node describing the console device. This adds a helper function
to match a device against this property so a driver can call
add_preferred_console for a matching device.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/of/base.c | 26 ++++++++++++++++++++++++++
include/linux/of.h | 7 +++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 5c54279..1c3c79c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -32,6 +32,7 @@ struct device_node *of_allnodes;
EXPORT_SYMBOL(of_allnodes);
struct device_node *of_chosen;
struct device_node *of_aliases;
+static struct device_node *of_stdout;
DEFINE_MUTEX(of_aliases_mutex);
@@ -1595,6 +1596,15 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
of_chosen = of_find_node_by_path("/chosen");
if (of_chosen == NULL)
of_chosen = of_find_node_by_path("/chosen@0");
+
+ if (of_chosen) {
+ const char *name;
+
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name)
+ of_stdout = of_find_node_by_path(name);
+ }
+
of_aliases = of_find_node_by_path("/aliases");
if (!of_aliases)
return;
@@ -1703,3 +1713,19 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
return curv;
}
EXPORT_SYMBOL_GPL(of_prop_next_string);
+
+/**
+ * of_device_is_stdout_path - check if a device node matches the
+ * linux,stdout-path property
+ *
+ * Check if this device node matches the linux,stdout-path property
+ * in the chosen node. return true if yes, false otherwise.
+ */
+int of_device_is_stdout_path(struct device_node *dn)
+{
+ if (!of_stdout)
+ return false;
+
+ return of_stdout == dn;
+}
+EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
diff --git a/include/linux/of.h b/include/linux/of.h
index 1fd08ca..429e168 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -343,6 +343,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
s; \
s = of_prop_next_string(prop, s))
+int of_device_is_stdout_path(struct device_node *dn);
+
#else /* CONFIG_OF */
static inline const char* of_node_full_name(struct device_node *np)
@@ -505,6 +507,11 @@ static inline int of_machine_is_compatible(const char *compat)
return 0;
}
+static inline int of_device_is_stdout_path(struct device_node *dn)
+{
+ return 0;
+}
+
#define of_match_ptr(_ptr) NULL
#define of_match_node(_matches, _node) NULL
#define of_property_for_each_u32(np, propname, prop, p, u) \
--
1.8.4.rc0
next prev parent reply other threads:[~2013-08-05 12:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-05 12:40 [PATCH v6] linux,stdout-path helper Sascha Hauer
2013-08-05 12:40 ` Sascha Hauer [this message]
2013-08-05 12:59 ` [PATCH 1/2] OF: Add helper for matching against linux,stdout-path Rob Herring
2013-08-05 13:16 ` Sascha Hauer
2013-08-05 12:40 ` [PATCH 2/2] serial: i.MX: evaluate linux,stdout-path property Sascha Hauer
2013-08-12 6:04 ` [PATCH v6] linux,stdout-path helper Sascha Hauer
2013-08-12 18:22 ` Greg Kroah-Hartman
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