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powerpc/legacy_serial: Bail if reg-offset/shift properties are present

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The legacy serial driver does not work with an 8250 type UART that is
described in the device tree with the reg-offset and reg-shift
properties.  This change makes legacy_serial ignore these devices.

Signed-off-by: John Linn <john.linn@xilinx.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
John Linn 2008-07-01 10:52:41 -07:00 committed by Grant Likely
parent 5d1a04110b
commit 1e6d1f2606
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/kernel/legacy_serial.c
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@ -136,6 +136,11 @@ static int __init add_legacy_soc_port(struct device_node *np,
if (of_get_property(np, "clock-frequency", NULL) == NULL)
return -1;
/* if reg-shift or offset, don't try to use it */
if ((of_get_property(np, "reg-shift", NULL) != NULL) ||
(of_get_property(np, "reg-offset", NULL) != NULL))
return -1;
/* if rtas uses this device, don't try to use it as well */
if (of_get_property(np, "used-by-rtas", NULL) != NULL)
return -1;