From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
To: Peter Chen <hzpeterchen@gmail.com>, Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-pm@vger.kernel.org, linux-usb@vger.kernel.org,
Ulf Hansson <ulf.hansson@linaro.org>,
Sebastian Reichel <sre@kernel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mark Brown <broonie@kernel.org>,
hverkuil@xs4all.nl, tjakobi@math.uni-bielefeld.de,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
m.szyprowski@samsung.com
Subject: Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting
Date: Fri, 06 May 2016 08:12:24 +0200 [thread overview]
Message-ID: <572C35C8.9080709@samsung.com> (raw)
In-Reply-To: <20160506054459.GA32359@shlinux2.ap.freescale.net>
On 05/06/2016 07:44 AM, Peter Chen wrote:
> On Thu, May 05, 2016 at 05:42:40PM -0500, Rob Herring wrote:
>> On Thu, May 05, 2016 at 02:34:13PM +0200, Krzysztof Kozlowski wrote:
>>> Hi,
>>>
>>> This is a different, second try to fix usb3503+lan on Odroid U3 board
>>> if it was initialized by bootloader (e.g. for TFTP boot).
>>>
>>> First version:
>>> http://www.spinics.net/lists/linux-usb/msg140042.html
>>>
>>>
>>> Problem
>>> =======
>>> When Odroid U3 (usb3503 + smsc95xx + max77686) boots from network (TFTP),
>>> the usb3503 and LAN smsc95xx do 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.
>>>
>>> From the schematics, the regulator is a supply only to LAN, however
>>> without toggling it off/on, the usb3503 hub won appear neither.
>>>
>>>
>>> Solution
>>> ========
>>> This is very similar to the MMC pwrseq behavior so the idea is to:
>>> 1. Move MMC pwrseq drivers to generic place,
>>
>> You can do that, but I'm going to NAK any use of pwrseq bindings outside
>> of MMC. I think it is the wrong way to do things. The DT should describe
>> the devices. If they happen to be "simple" then the core can walk the
>> tree and do any setup. For example, look for "reset-gpios" and toggle
>> that GPIO. There is no need for a special node.
>>
>
> Oh, I am doing the same thing like this patch set doing.
Shame on me that I did not use Google before starting the work. I could
just extend your patchset. I think we can combine our efforts.
Best regards,
Krzysztof
next prev parent reply other threads:[~2016-05-06 6:12 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-05 12:34 [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 01/13] usb: misc: usb3503: Clean up on driver unbind Krzysztof Kozlowski
2016-05-05 18:32 ` Javier Martinez Canillas
2016-05-06 6:13 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 02/13] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski
2016-05-05 18:44 ` Javier Martinez Canillas
2016-05-06 6:15 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 03/13] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Krzysztof Kozlowski
2016-05-05 18:46 ` Javier Martinez Canillas
2016-05-05 12:34 ` [RFC v2 06/13] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Krzysztof Kozlowski
[not found] ` <1462451666-17945-7-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-05 19:14 ` Javier Martinez Canillas
2016-05-05 12:34 ` [RFC v2 07/13] power: pwrseq: simple: Add support for toggling regulator Krzysztof Kozlowski
2016-05-05 19:31 ` Javier Martinez Canillas
2016-05-06 6:24 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 08/13] usb: hub: Handle deferred probe Krzysztof Kozlowski
2016-05-05 19:33 ` Javier Martinez Canillas
2016-05-05 12:34 ` [RFC v2 09/13] power: pwrseq: Add support for USB hubs with external power Krzysztof Kozlowski
[not found] ` <1462451666-17945-10-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-05 19:52 ` Javier Martinez Canillas
2016-05-06 6:26 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 10/13] usb: hub: Power sequence the ports on activation Krzysztof Kozlowski
[not found] ` <1462451666-17945-11-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-05 14:09 ` Alan Stern
2016-05-05 17:37 ` Krzysztof Kozlowski
2016-05-05 19:56 ` Javier Martinez Canillas
[not found] ` <1462451666-17945-1-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-05 12:34 ` [RFC v2 04/13] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski
[not found] ` <1462451666-17945-5-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-05 18:57 ` Javier Martinez Canillas
2016-05-05 12:34 ` [RFC v2 05/13] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski
2016-05-05 19:09 ` Javier Martinez Canillas
2016-05-06 6:20 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski
2016-05-05 20:10 ` Javier Martinez Canillas
2016-05-06 6:27 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 12/13] ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 Krzysztof Kozlowski
2016-05-05 20:11 ` Javier Martinez Canillas
2016-05-05 22:42 ` [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Rob Herring
2016-05-06 5:44 ` Peter Chen
2016-05-06 6:12 ` Krzysztof Kozlowski [this message]
[not found] ` <572C35C8.9080709-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-05-06 7:15 ` Peter Chen
2016-05-06 6:10 ` Krzysztof Kozlowski
2016-05-06 13:01 ` Rob Herring
2016-05-09 7:46 ` Ulf Hansson
2016-05-09 18:18 ` Rob Herring
2016-05-10 11:02 ` Ulf Hansson
[not found] ` <CAPDyKFq2=mqujFjvJSYxg2nVmK=OrBKLtFfb-ErNJO3Zr_LMVw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-05-28 3:36 ` Peter Chen
2016-05-31 0:58 ` Peter Chen
2016-05-31 11:54 ` Krzysztof Kozlowski
2016-05-05 12:34 ` [RFC v2 13/13] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization on Odroid U3 Krzysztof Kozlowski
2016-05-05 20:16 ` Javier Martinez Canillas
2016-05-06 6:28 ` Krzysztof Kozlowski
2016-12-13 12:20 ` [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Hans Verkuil
2016-12-13 12:34 ` Hans Verkuil
2016-12-13 13:53 ` Krzysztof Kozlowski
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