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Groups > linux.kernel > #1411451
| From | Stephen Boyd <stephen.boyd@linaro.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree |
| Date | 2016-06-01 20:20 +0200 |
| Message-ID | <rFiUi-3wl-19@gated-at.bofh.it> (permalink) |
| References | <rF9nX-5Ug-7@gated-at.bofh.it> <rF9nX-5Ug-15@gated-at.bofh.it> <rFaan-6aY-43@gated-at.bofh.it> <rFdhT-8iE-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Quoting Peter Chen (2016-06-01 05:05:20) > On Wed, Jun 01, 2016 at 01:57:23AM -0700, Stephen Boyd wrote: > > Quoting Krzysztof Kozlowski (2016-06-01 01:02:18) > > > Parse usb-pwrseq property from Device Tree to get the phandle to pwrseq > > > device. The pwrseq device will be used by USB hub to cycle the power > > > before activating ports. > > > > > > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> > > > > Drive by review comment. > > > > I was hoping this would help me with a problem I'm having where I have a > > hub (smsc4604) that needs to be taken out of reset before my HSIC > > controller sends a USB reset to it, but it seems this is more about > > doing some sort of power on sequence after enumeration? > > > > No, you may need to do reset before enumeration, the general purpose of > reset is eliminate unstable hardware state, and let the controller find > the device. > > Try to do it at bootloader to see if it works for you. > Sorry the bootloader doesn't do this so that doesn't work for me.
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[PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:10 +0200
Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Stephen Boyd <stephen.boyd@linaro.org> - 2016-06-01 11:00 +0200
Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 11:10 +0200
Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Peter Chen <hzpeterchen@gmail.com> - 2016-06-01 14:20 +0200
Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Stephen Boyd <stephen.boyd@linaro.org> - 2016-06-01 20:20 +0200
Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Peter Chen <hzpeterchen@gmail.com> - 2016-06-02 03:40 +0200
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