linux-kernel - [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP booting

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Date:	Fri, 29 Apr 2016 12:59:48 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-usb@...r.kernel.org
Cc:	linux.amoon@...il.com, tjakobi@...h.uni-bielefeld.de,
	m.szyprowski@...sung.com, hverkuil@...all.nl,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP
 booting

Hi,

Patches are independent, please pick up as you wish.

However all of them are needed to solve the issue, so I am sending
everything together for easier testng.

Problem
=======
When Odroid U3 (usb3503 + smsc95xx + max77686) boots from network (TFTP),
the usb3503 does not show up in "lsusb". Hard-reset is required, e.g.
by suspend to RAM. The actual TFTP boot does not have to happen. Just
"usb start" from U-Boot is sufficient.

Solution
========
Perform real hardware reset (including regulator off/on) when probing.

Tested on Odroid U3 so far. Please kindly test on X2 and other
configurations and bootloaders.

Best regards,
Krzysztof

Krzysztof Kozlowski (3):
  usb: misc: usb3503: Fix HUB mode after bootloader initialization
  ARM: dts: exynos: Provide regulator for usb3503 on Odroid to fix
    device detection
  regulator: max77686: Configure enable time to properly handle
    regulator enable

 Documentation/devicetree/bindings/usb/usb3503.txt |  1 +
 arch/arm/boot/dts/exynos4412-odroidu3.dts         |  2 +
 drivers/regulator/max77686-regulator.c            |  5 ++
 drivers/usb/misc/usb3503.c                        | 81 +++++++++++++++++++++++
 4 files changed, 89 insertions(+)

-- 
1.9.1