linux-kernel - Re: [PATCH can-next v6] can: add tx/rx LED trigger support

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Date:	Fri, 24 Aug 2012 13:28:16 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Fabio Baltieri <fabio.baltieri@...il.com>,
	linux-can@...r.kernel.org, linux-kernel@...r.kernel.org,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>
Subject: Re: [PATCH can-next v6] can: add tx/rx LED trigger support

On 08/24/2012 07:10 AM, Kurt Van Dijck wrote:
> Hello,
> 
> I find the CAN led triggers an interesting thing.
> 
> And then, this scenario fell crossed my mind:
> Imagine I do:
> [insert CAN device: can0]
> $ ip link set can0 name helga
> [insert another CAN device: again 'can0']
> 
> Registering 'can0-tx' led trigger will fail for the second CAN device,
> since that led trigger name is already reserved for CAN device 'helga'.

Good point.

> I'm not sure how to fix such.
> If 'rx' & 'tx' may be combined, reusing the netdev name may be possible?
> Just wild thinking ...

I think the device's name (not netdev) is unique in the system and
cannot be changed.

On my device tree enabled mx28 I'm talking about the "80032000.can" in:

> dmesg |grep flexcan
> flexcan 80032000.can: device registered (reg_base=f5032000, irq=8)
> flexcan 80034000.can: device registered (reg_base=f5034000, irq=9)

> $ ls /sys/bus/platform/devices/*can* -d
> /sys/bus/platform/devices/80032000.can
> /sys/bus/platform/devices/80034000.can

regards, Marc

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