Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / Documentation / ABI / testing / sysfs-platform-at91

diff --git a/Documentation/ABI/testing/sysfs-platform-at91 b/Documentation/ABI/testing/sysfs-platform-at91
new file mode 100644 (file)
index 0000000..4cc6a86
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-at91
@@ -0,0 +1,25 @@
+What:          /sys/devices/platform/at91_can/net/<iface>/mb0_id
+Date:          January 2011
+KernelVersion: 2.6.38
+Contact:       Marc Kleine-Budde <kernel@pengutronix.de>
+Description:
+               Value representing the can_id of mailbox 0.
+
+               Default: 0x7ff (standard frame)
+
+               Due to a chip bug (errata 50.2.6.3 & 50.3.5.3 in
+               "AT91SAM9263 Preliminary 6249H-ATARM-27-Jul-09") the
+               contents of mailbox 0 may be send under certain
+               conditions (even if disabled or in rx mode).
+
+               The workaround in the errata suggests not to use the
+               mailbox and load it with an unused identifier.
+
+               In order to use an extended can_id add the
+               CAN_EFF_FLAG (0x80000000U) to the can_id. Example:
+
+               - standard id 0x7ff:
+               echo 0x7ff      > /sys/class/net/can0/mb0_id
+
+               - extended id 0x1fffffff:
+               echo 0x9fffffff > /sys/class/net/can0/mb0_id