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serial/imx: let probing fail for the dt case without a valid alias

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When the uart device is instantiated by dt but dt doesn't provide an
alias then better let probing fail instead of falling back to an
unrelated device id used for the line number and no platform data.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Uwe Kleine-König 2011-12-15 09:16:34 +01:00 committed by Greg Kroah-Hartman
parent a197a191f7
commit 20bb8095a4
1 changed files with 10 additions and 3 deletions
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13
drivers/tty/serial/imx.c
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@ -1302,6 +1302,10 @@ static int serial_imx_resume(struct platform_device *dev)
}
#ifdef CONFIG_OF
/*
* 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.
*/
static int serial_imx_probe_dt(struct imx_port *sport,
struct platform_device *pdev)
{
@ -1311,7 +1315,8 @@ static int serial_imx_probe_dt(struct imx_port *sport,
int ret;
if (!np)
return -ENODEV;
/* no device tree device */
return 1;
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
@ -1334,7 +1339,7 @@ static int serial_imx_probe_dt(struct imx_port *sport,
static inline int serial_imx_probe_dt(struct imx_port *sport,
struct platform_device *pdev)
{
return -ENODEV;
return 1;
}
#endif
@ -1369,8 +1374,10 @@ static int serial_imx_probe(struct platform_device *pdev)
return -ENOMEM;
ret = serial_imx_probe_dt(sport, pdev);
if (ret == -ENODEV)
if (ret > 0)
serial_imx_probe_pdata(sport, pdev);
else if (ret < 0)
goto free;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {