linux-kernel - omap5: dwc3 interface status in /sys

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Message-Id: <5ECC1431-E758-41E6-B751-D336A94433FA@goldelico.com>
Date:   Mon, 17 Sep 2018 10:24:16 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Felipe Balbi <balbi@...nel.org>, Roger Quadros <rogerq@...com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>
Subject: omap5: dwc3 interface status in /sys

Hi Felipe,
I have made otg mode work on the omap5-uevm with help from Roger
and now I wonder how to read the interface status for GUI display.

On omap3/twl4030 systems we can simply read

	/sys/bus/platform/devices/musb-hdrc.0.auto/mode

and get reports e.g. "b_peripheral", "a_host", "b_idle" etc. which can easily
be translated into icons for GUI display.

We have not found a similar attribute for dwc3 (except part of this information
in

	/sys/kernel/debug/4a030000.dwc3

but mounting debugfs for GUI purposes isn't a good idea).

So do you think it is possible to provide such information to

	/sys/devices/platform/44000000.ocp/4a020000.omap_dwc3/4a030000.dwc3?

BR,
Nikolaus