Re: [PATCH] imx{5,6}: reset otg port after usb-serial boot

From: Michael Grzeschik <mgr@pengutronix.de>
To: Fabio Estevam <festevam@gmail.com>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH] imx{5,6}: reset otg port after usb-serial boot
Date: Mon, 27 Aug 2018 09:47:41 +0200	[thread overview]
Message-ID: <20180827074741.rnmenb6mvjzv2qto@pengutronix.de> (raw)
In-Reply-To: <CAOMZO5AMUiaPyaGcfNz2NtApwgthYGSYSH0Xx94F83q1qESKxQ@mail.gmail.com>

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On Fri, Aug 24, 2018 at 05:18:02PM -0300, Fabio Estevam wrote:
> Hi Michael,
> 
> On Fri, Aug 24, 2018 at 4:55 PM, Michael Grzeschik <mgr@pengutronix.de> wrote:
> 
> > I get that it is not safe to toggle bits if the clock is not
> > there. We could check for the bootsource. Is it possible to
> > ensure that we are started by imx-usb-loader?
> 
> It is possible to determine if we have started via USB download mode.
> 
> Check the is_boot_from_usb() implementation in U-Boot for a reference.

Right, So it seems to be safe to reach for the phys registers on mx6.

On mx5 and similar we have a nop phy and the only way to
communicate with it is through usbmisc, which is also in the
register space that leads to a hang if one clock is missing.

I will search for another solutions on those SoCs.

mgr

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