linux-kernel - [PATCH] of/fdt: fix aliases with baudrate in earlycon

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Date:	Sat, 10 Oct 2015 01:29:30 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	robh+dt@...nel.org, frowand.list@...il.com, grant.likely@...aro.org
Cc:	galak@...eaurora.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH] of/fdt: fix aliases with baudrate in earlycon

Many boards use an alias in the stdout-path specification along
with console options after a colon (e.g. serial0:115200n8). When
using earlycon, this specification currently does not work. While
fdt_path_offset supports alias resolution, it does not remove the
console options by itself. Use the fdt_path_offset_namelen variant
and provide the length of the alias to enable aliases with console
options in the stdout-path.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
Hi,

Stumbled upon this while testing 32-bit ARM earlycon support. It
seems that this once already came up on the list:
https://lkml.org/lkml/2015/3/13/562

--
Stefan

 drivers/of/fdt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6e82bc42..9fc3568 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -813,8 +813,11 @@ static int __init early_init_dt_scan_chosen_serial(void)
 	if (!p || !l)
 		return -ENOENT;

+	/* Remove console options if present */
+	l = strchrnul(p, ':') - p;
+
 	/* Get the node specified by stdout-path */
-	offset = fdt_path_offset(fdt, p);
+	offset = fdt_path_offset_namelen(fdt, p, l);
 	if (offset < 0)
 		return -ENODEV;

-- 
2.6.1

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