Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree
From: Stephen Boyd
Date: Wed Jun 01 2016 - 14:16:49 EST
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@xxxxxxxxxxx>
> > 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.