linux-kernel - Re: [PATCH V4] leds: trigger: Introduce an USB port trigger

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Date:   Sat, 3 Sep 2016 20:24:05 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
cc:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        Rafał Miłecki <zajec5@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Richard Purdie <rpurdie@...ys.net>,
        Felipe Balbi <balbi@...nel.org>,
        Peter Chen <hzpeterchen@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Jonathan Corbet <corbet@....net>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Stephan Linz <linz@...pro.net>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>
Subject: Re: [PATCH V4] leds: trigger: Introduce an USB port trigger

On Sat, 3 Sep 2016, Jacek Anaszewski wrote:

> >> The remaining issue is the sysfs interface design for defining and
> >> presenting multiple USB ports. I'm still in favour of a single
> >> attribute with space separated list. This scheme is commonly used
> >> in existing interfaces.
> >
> > No such interface is needed if you do things the way I outlined above.
> > Each trigger would require the user to specify either one port, one
> > hub, or nothing at all.  Multiple ports would not be used.
> 
> The patch assumes that it is possible to register trigger for many
> ports.

The patch could be changed to remove that assumption.

Alan Stern