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Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader initialization

From Mark Brown <broonie@kernel.org>
Newsgroups linux.kernel
Subject Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader initialization
Date 2016-05-02 13:00 +0200
Message-ID <rujK1-1Me-3@gated-at.bofh.it> (permalink)
References (1 earlier) <rtet4-4St-17@gated-at.bofh.it> <rteW5-58U-11@gated-at.bofh.it> <rtffr-5kO-3@gated-at.bofh.it> <rtjM6-PX-11@gated-at.bofh.it> <ruiEi-Zl-11@gated-at.bofh.it>
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On Mon, May 02, 2016 at 11:49:12AM +0200, Krzysztof Kozlowski wrote:

> This VDD regulator supply actually is not a usb3503 USB HUB regulator
> supply... but a supply to the LAN attached to this HUB. Regulator off/on
> is needed for LAN to show up. The hub will show up with typical reset
> (which is also missing before my patchset btw).

> The LAN, as a USB device, is auto-probed so it cannot take the regulator
> and play with it. The simplest idea I have is to add it as "external
> supply"  to the parent: usb3503.

This is common enough that that just isn't going to scale well I fear
without some generic handling, either walking child devices at the bus
level or at the device level with a pre-probe() callback to get the
device to power on.  The latter is more appropriate to things like
Slimbus where the device is more likely to do active management at
runtime, it's not clear people are building USB devices like that.

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Thread

[RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-04-29 13:10 +0200
  [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader  initialization Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-04-29 13:10 +0200
    Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after  bootloader initialization Mark Brown <broonie@kernel.org> - 2016-04-29 13:40 +0200
      Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader  initialization Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-04-29 14:00 +0200
        Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after  bootloader initialization Mark Brown <broonie@kernel.org> - 2016-04-29 18:50 +0200
          Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader  initialization Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-02 11:50 +0200
            Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader  initialization Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-02 12:50 +0200
            Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after  bootloader initialization Mark Brown <broonie@kernel.org> - 2016-05-02 13:00 +0200
              Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after  bootloader initialization Rob Herring <robh@kernel.org> - 2016-05-03 20:10 +0200
                Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after bootloader  initialization Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-04 14:10 +0200
                Re: [RFT PATCH 1/3] usb: misc: usb3503: Fix HUB mode after  bootloader initialization Mark Brown <broonie@kernel.org> - 2016-05-04 20:30 +0200
  Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Hans Verkuil <hverkuil@xs4all.nl> - 2016-04-30 11:50 +0200
    Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-01 15:20 +0200
      Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Hans Verkuil <hverkuil@xs4all.nl> - 2016-05-01 16:20 +0200
        Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Hans Verkuil <hverkuil@xs4all.nl> - 2016-05-01 18:10 +0200
          Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-01 18:50 +0200
            Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Hans Verkuil <hverkuil@xs4all.nl> - 2016-05-02 15:50 +0200
              Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-02 15:50 +0200
          Re: [RFT PATCH 0/3] usb: misc: usb3503: Fix missing device when TFTP  booting Marek Szyprowski <m.szyprowski@samsung.com> - 2016-05-02 08:00 +0200

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