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Date: Wed, 01 Jun 2016 11:16:34 -0700 From: Stephen Boyd <stephen.boyd@...aro.org> To: Peter Chen <hzpeterchen@...il.com> Cc: "Krzysztof Kozlowski" <k.kozlowski@...sung.com>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, "Bartlomiej Zolnierkiewicz" <b.zolnierkie@...sung.com>, "Ulf Hansson" <ulf.hansson@...aro.org>, "Sebastian Reichel" <sre@...nel.org>, "Dmitry Eremin-Solenikov" <dbaryshkov@...il.com>, "David Woodhouse" <dwmw2@...radead.org>, "Javier Martinez Canillas" <javier@....samsung.com>, linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org, linux-pm@...r.kernel.org, "Alan Stern" <stern@...land.harvard.edu>, linux-usb@...r.kernel.org, "Rob Herring" <robh+dt@...nel.org>, "Pawel Moll" <pawel.moll@....com>, "Mark Rutland" <mark.rutland@....com>, "Ian Campbell" <ijc+devicetree@...lion.org.uk>, "Kumar Gala" <galak@...eaurora.org>, "Kukjin Kim" <kgene@...nel.org>, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org Subject: Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree 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@...sung.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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