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Date:   Sun, 29 Nov 2020 01:51:54 +0200
From:   Aaro Koskinen <aaro.koskinen@iki.fi>
To:     Linus Walleij <linus.walleij@linaro.org>,
        Tony Lindgren <tony@atomide.com>,
        Alan Stern <stern@rowland.harvard.edu>
Cc:     linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [BISECTED REGRESSION] Broken USB/GPIO on OMAP1 OSK
Message-ID: <20201128235154.GF551434@darkstar.musicnaut.iki.fi>
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Hi,

I tried to upgrade my OMAP1 OSK board to v5.9, but the rootfs cannot
be accessed anymore due to broken USB. It fails to probe with the
following logs:

[    9.219940] ohci ohci: cannot find GPIO chip i2c-tps65010, deferring
[    9.250366] ohci ohci: cannot find GPIO chip i2c-tps65010, deferring
[    9.731445] ohci ohci: cannot find GPIO chip i2c-tps65010, deferring
[   10.342102] ohci ohci: cannot find GPIO chip i2c-tps65010, deferring
[   10.966430] ohci ohci: cannot find GPIO chip i2c-tps65010, deferring

Bisected to:

commit 15d157e874437e381643c37a10922388d6e55b29
Author: Linus Walleij <linus.walleij@linaro.org>
Date:   Mon Jul 20 15:55:24 2020 +0200

    usb: ohci-omap: Convert to use GPIO descriptors

I suspect one of the issues is the name "i2c-tps65010" vs "tps65010":

# cat /sys/devices/platform/omap_i2c.1/i2c-1/i2c-tps65010/gpio/gpiochip208/label
tps65010

However changing that in the lookup table still doesn't help much; I got rid
of the "deferring" message but the USB still doesn't work. So far the only
workaround I have is to revert the whole commit.

A.