From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-serial@vger.kernel.org
Cc: Alan Cox <alan@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
linux-kernel@vger.kernel.org,
devicetree-discuss@lists.ozlabs.org,
<linux-arm-kernel@lists.infradead.org>,
Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH] serial: i.MX: evaluate linux,stdout-path property
Date: Thu, 4 Oct 2012 12:39:51 +0200 [thread overview]
Message-ID: <1349347191-7406-1-git-send-email-s.hauer@pengutronix.de> (raw)
devicetrees may have the linux,stdout-path property to specify the
console. This patch adds support to the i.MX serial driver for this.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
I was originally looking for a more generic way to handle this, but
since a struct console has no device associated to it, it's not
possible to match a console with a device in a generic way. So we
just call add_preferred_console from the driver and let it go down
to a string matching in the console code.
If anyone has a better idea how to handle this, please let me know.
Otherwise I'm happy to see this patch applied aswell.
Thanks
Sascha
drivers/tty/serial/imx.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index e309e8b..b52c4a7 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1397,6 +1397,32 @@ static int serial_imx_resume(struct platform_device *dev)
#ifdef CONFIG_OF
/*
+ * Check if this device matches the linux,stdout-path property
+ * in the chosen node. return true if yes, false otherwise
+ */
+static int serial_imx_is_stdoutpath(struct platform_device *pdev)
+{
+ struct device_node *dn;
+ const char *name;
+
+ if (!IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE))
+ return 0;
+
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name == NULL)
+ return 0;
+
+ dn = of_find_node_by_path(name);
+ if (!dn)
+ return 0;
+
+ if (dn == pdev->dev.of_node)
+ return 1;
+
+ return 0;
+}
+
+/*
* This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it
* could successfully get all information from dt or a negative errno.
*/
@@ -1427,6 +1453,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
sport->devdata = of_id->data;
+ if (serial_imx_is_stdoutpath(pdev))
+ add_preferred_console(imx_reg.cons->name, sport->port.line, 0);
+
return 0;
}
#else
--
1.7.10.4
next reply other threads:[~2012-10-04 10:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-04 10:39 Sascha Hauer [this message]
2012-10-04 12:44 ` [PATCH] serial: i.MX: evaluate linux,stdout-path property Rob Herring
2012-10-04 13:12 ` Sascha Hauer
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