linux-kernel - [PATCH v3 3/3] of: support passing console options with stdout-path

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Date:	Thu, 27 Nov 2014 17:56:07 +0000
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	mark.rutland@....com, grant.likely@...aro.org, robh+dt@...nel.org,
	plagnioj@...osoft.com, ijc@...ian.org, andrew@...n.ch,
	s.hauer@...gutronix.de
Subject: [PATCH v3 3/3] of: support passing console options with stdout-path

Support specifying console options (like with console=ttyXN,<options>)
by appending them to the stdout-path property after a separating ':'.

Example:
        stdout-path = "uart0:115200";

Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
---
 drivers/of/base.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 7f0e5f7..6d2d45e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -37,6 +37,7 @@ EXPORT_SYMBOL(of_allnodes);
 struct device_node *of_chosen;
 struct device_node *of_aliases;
 struct device_node *of_stdout;
+static const char *of_stdout_options;
 
 struct kset *of_kset;
 
@@ -1844,7 +1845,7 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
 		if (IS_ENABLED(CONFIG_PPC) && !name)
 			name = of_get_property(of_aliases, "stdout", NULL);
 		if (name)
-			of_stdout = of_find_node_by_path(name);
+			of_stdout = of_find_node_opts_by_path(name, &of_stdout_options);
 	}
 
 	if (!of_aliases)
@@ -1968,9 +1969,13 @@ EXPORT_SYMBOL_GPL(of_prop_next_string);
  */
 bool of_console_check(struct device_node *dn, char *name, int index)
 {
+	char *console_options;
+
 	if (!dn || dn != of_stdout || console_set_on_cmdline)
 		return false;
-	return !add_preferred_console(name, index, NULL);
+
+	console_options = kstrdup(of_stdout_options, GFP_KERNEL);
+	return !add_preferred_console(name, index, console_options);
 }
 EXPORT_SYMBOL_GPL(of_console_check);
 
-- 
1.7.10.4

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