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From: Pavel Machek <pavel@ucw.cz>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Jacek Anaszewski" <jacek.anaszewski@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
	linux-can@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 4/4] leds: netdev trigger: allow setting initial values in device tree
Date: Thu, 14 Mar 2019 13:00:47 +0100	[thread overview]
Message-ID: <20190314120047.GA19072@amd> (raw)
In-Reply-To: <6fb71b90-1ae3-9d93-6e0c-c95e441ced7a@rasmusvillemoes.dk>

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On Thu 2019-03-14 12:26:38, Rasmus Villemoes wrote:
> On 14/03/2019 11.29, Pavel Machek wrote:
> > On Wed 2019-03-13 21:26:15, Rasmus Villemoes wrote:
> >> It can be quite convenient to initialize a netdev-triggered LED with a
> >> device name and setting the rx,tx,link properties from device tree,
> >> instead of having to do that in an init script in userspace.
> >>
> >> +                The optional child node netdev can be used to
> >> +                configure initial values for the link, rx, tx and
> >> +                device_name properties. For example, setting
> >> +                linux,default-trigger = "netdev" and adding the child
> >> +                node
> >> +
> >> +                netdev {
> >> +                    rx;
> >> +                    tx;
> >> +                    link;
> >> +                    device-name = "can0";
> >> +                };
> >> +
> >> +                can be used to replace 'linux,default-trigger =
> >> +                "can0-rxtx"' that relies on the deprecated
> >> +                CONFIG_CAN_LEDS.
> > 
> > I'm sorry, but no, not like this. I see it works for you, only having
> > single can device, but it would quickly break with two of them and two
> > ethernets are rather common.
> > 
> > So this will need to be device = <&phandle_of_ethernet_device> or
> > something like that. There may be example with usb port triggers.
> 
> Huh? I have two CAN devices, and there are two LEDs on the front panel
> labeled CAN-A and CAN-B; my device tree nodes for that are
...
> and this works just fine. The only change from the old DT is the
> addition of the netdev nodes and changing linux,default-trigger from
> "can0-rxtx", "can1-rxtx" to both "netdev".

Yeah and now insert the modules for the can devices in different
order... May not happen in your case but will be fairly common for
ethernets.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  reply	other threads:[~2019-03-14 12:00 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190311144227.GA4404@amd>
     [not found] ` <20190313202615.22883-1-linux@rasmusvillemoes.dk>
2019-03-13 20:26   ` [PATCH 1/4] leds: netdev trigger: use memcpy in device_name_store Rasmus Villemoes
2019-03-14  9:29     ` Uwe Kleine-König
2019-03-14  9:57       ` Rasmus Villemoes
2019-03-14 10:04         ` Uwe Kleine-König
2019-03-14 10:14     ` Pavel Machek
2019-03-14 10:54       ` Rasmus Villemoes
2019-03-14 12:16         ` Pavel Machek
2019-03-13 20:26   ` [PATCH 2/4] leds: netdev trigger: factor out middle part of device_name_store Rasmus Villemoes
2019-03-14  9:31     ` Uwe Kleine-König
2019-03-14  9:57       ` Rasmus Villemoes
2019-03-14 10:15       ` Pavel Machek
2019-03-14 10:20         ` Uwe Kleine-König
2019-03-13 20:26   ` [PATCH 3/4] leds: netdev trigger: add documentation to leds/common.txt Rasmus Villemoes
2019-03-13 20:26   ` [PATCH 4/4] leds: netdev trigger: allow setting initial values in device tree Rasmus Villemoes
2019-03-14  9:36     ` Uwe Kleine-König
2019-03-14 10:28       ` Rasmus Villemoes
2019-03-14 10:29     ` Pavel Machek
2019-03-14 11:26       ` Rasmus Villemoes
2019-03-14 12:00         ` Pavel Machek [this message]
2019-03-14 13:19           ` Rasmus Villemoes
2019-03-17 19:11             ` Pavel Machek
2019-03-24 20:39               ` Rasmus Villemoes
2019-03-14 10:32     ` Jacek Anaszewski
     [not found]   ` <20190314140619.3309-1-linux@rasmusvillemoes.dk>
2019-03-14 14:06     ` [PATCH v2 1/6] leds: netdev trigger: use memcpy in device_name_store Rasmus Villemoes
2019-03-18 11:20       ` Pavel Machek
2019-03-26 19:53       ` Jacek Anaszewski
2019-03-27 15:26         ` Rasmus Villemoes
2019-03-27 21:20           ` Jacek Anaszewski
2019-03-27 21:31             ` Rasmus Villemoes
2019-03-27 21:45               ` Jacek Anaszewski
2019-03-14 14:06     ` [PATCH v2 2/6] leds: netdev trigger: factor out middle part of device_name_store Rasmus Villemoes
2019-03-18 11:24       ` Pavel Machek
2019-03-14 14:06     ` [PATCH v2 3/6] leds: netdev trigger: move newline handling back to device_name_store Rasmus Villemoes
2019-03-18 11:25       ` Pavel Machek
2019-03-14 14:06     ` [PATCH v2 4/6] leds: netdev trigger: move name length checking to netdev_trig_set_device Rasmus Villemoes
2019-03-18 11:26       ` Pavel Machek
2019-03-14 14:06     ` [PATCH v2 5/6] leds: netdev trigger: add documentation to leds/common.txt Rasmus Villemoes
2019-03-14 14:06     ` [PATCH v2 6/6] leds: netdev trigger: allow setting initial values in device tree Rasmus Villemoes
2019-03-14 14:24       ` Jacek Anaszewski
2019-03-14 15:05         ` Rasmus Villemoes
2019-03-14 15:36           ` Jacek Anaszewski
2019-03-18 11:54       ` Pavel Machek
2019-03-28 16:28       ` Rob Herring

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