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authorMarc Kleine-Budde <mkl@pengutronix.de>2011-01-10 20:44:22 +0100
committerMarc Kleine-Budde <mkl@pengutronix.de>2011-01-24 14:56:37 +0100
commit3a5655a5b545e9647c3437473ee3d815fe1b9050 (patch)
tree5cadf4eaf9b3631b498a4ddfbee8c7458463b37c /Documentation
parent9e0a2d1ca3de6e284e99ad5cae1ae33ecb74c479 (diff)
downloadlinux-linaro-android-3a5655a5b545e9647c3437473ee3d815fe1b9050.tar.gz
can: at91_can: make can_id of mailbox 0 configurable
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. This patch implements the second part of the workaround. A sysfs entry "mb0_id" is introduced. While the interface is down it can be used to configure the can_id of mailbox 0. The default value id 0x7ff. 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 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Wolfgang Grandegger <wg@grandegger.com> Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be> For the Documentation-part: Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-platform-at9125
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-at91 b/Documentation/ABI/testing/sysfs-platform-at91
new file mode 100644
index 00000000000..4cc6a865ae6
--- /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