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Date: Thu, 17 Jul 2014 10:04:39 +0200
From: Eric =?ISO-8859-1?B?QuluYXJk?= <eric@eukrea.com>
To: Stuart Longland <stuartl@vrt.com.au>
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Cc: meta-freescale@yoctoproject.org
Subject: Re: mxs-auart and LED triggers
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Hi Stuart,

Le Thu, 17 Jul 2014 15:51:37 +1000,
Stuart Longland <stuartl@vrt.com.au> a =E9crit :
> Not sure if this is the place to ask or not, I'm currently in search for
> the upstream project that looks after the i.MX port of the mainline
> Linux kernel.
>=20
> We're busy building a device for polling energy meters over RS-485, and
> one of my colleagues asked if it were possible to use the activity LED
> on the unit to indicate RS-485 activity.
>=20
> Presently, I use it to indicate mmc0 activity.  I'm not sure if there's
> an equivalent for serial ports.
>=20
> I did a bit of searching, both for general purpose serial triggers
> through to auart-related triggers, nothing seemed to show up.
>=20
you're right and you will need to add a serial leg trigger and the
right hooks in the driver or the serial core depending the information you =
want to show on the leds.

> On a related note, the FlexCAN driver supports turning on/off regulators
> when someone brings up or down a CAN interface.  Is there an equivalent
> facility on mxs-auart that would turn on a regulator when someone opens
> a serial port?
>=20
you need to add the right hooks in the serial driver similar to what is
done in the CAN driver.

Best regards,
Eric