linux-kernel - Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree

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Message-ID: <146480499491.3686.4996610748316511864@sboyd-linaro>
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.