netdev - Re: [PATCH 3/3] can: at91_can: make can

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Message-ID: <4D2C4586.60207@pengutronix.de>
Date:	Tue, 11 Jan 2011 12:56:54 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Wolfgang Grandegger <wg@...ndegger.com>
CC:	Socketcan-core@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] can: at91_can: make can_id of mailbox 0 configurable

On 01/11/2011 12:45 PM, Wolfgang Grandegger wrote:
> On 01/11/2011 11:28 AM, Marc Kleine-Budde wrote:
>> 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 a 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 if 0x1fffffff:
              ^^
I've fixed the typo on my git repo. I'll send an updated series later.

>> echo 0x9fffffff > /sys/class/net/can0/mb0_id
> 
> As this is a device specific property, I think it should go into
> /sys/class/net/can0/device/.

The attribute goes autoamtically to /sys/class/net/can0 if you add it to
the driver via:

+       dev->sysfs_groups[0] = &at91_sysfs_attr_group;

I've copied this from the janz-ican3 driver[1].

regards, Marc

[1] http://lxr.linux.no/linux+v2.6.37/drivers/net/can/janz-ican3.c#L1682

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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