linux-kernel - Re: [PATCH v2 0/8] usb: add support for the generic PHY framework

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Date:	Tue, 15 Jul 2014 11:58:45 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
cc:	balbi@...com, <gregkh@...uxfoundation.org>,
	<Peter.Chen@...escale.com>, <kishon@...com>,
	<sergei.shtylyov@...entembedded.com>,
	<yoshihiro.shimoda.uh@...esas.com>,
	<alexandre.belloni@...e-electrons.com>,
	<thomas.petazzoni@...e-electrons.com>, <zmxu@...vell.com>,
	<jszhang@...vell.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/8] usb: add support for the generic PHY framework

On Tue, 15 Jul 2014, Antoine Ténart wrote:

> Hi all,
> 
> This is an attempt to add more common USB code aware of the generic PHY
> framework, while keeping the compatibility for the USB PHY one. It does
> not add the full support, some USB PHY specific functions not being
> available currently in the generic PHY subsystem (e.g. usb_phy_set_power()).
> But it allows to use the generic PHY framework in other cases, and might
> help others to convert their USB PHY drivers.
> 
> A little background: I submitted a series to support USB on Berlin SoCs[1].
> One patch added a new PHY driver in drivers/usb/phy and Felipe asked it to
> be in the generic PHY framework instead[2]. This PHY being used by a ChipIdea
> driver, changes were needed in ChipIdea, OTG and HCD.
> 
> This is done in 3 steps:
>         1. moving the OTG state from the USB PHY structure to the OTG one
>         2. renaming the field 'phy' to 'usb_phy'
>         3. adding a field for the generic framework PHY and dissociating its
>            use from the USB PHY one
> 
> Step 1 is in the first patch. Steps 2 and 3 are done for OTG, and ChipIdea
> subsystems in patches 2-3 and 7-8.
> 
> HCD generic PHY support was made by Sergei and Yoshihiro[1]. I added some
> modifications to make this support consistent with this series in patches
> 4-6.
> 
> I tested it by using the ChipIdea driver I introduced, both with an USB PHY
> and a PHY driver successfully. I also compiled a multi_v7 kernel (ARM), with
> every driver I could enable in the USB section.
> 
> I'd like more people to test and your inputs and suggestions on these changes.
> 
> Feel free to add Ccs if others might be interested in this. If needed patches
> can be squashed or divided, I tried there to group modifications by USB
> framework parts (OTG, HCD, ChipIdea).
> 
> Patches can also be found at:
> git://git.free-electrons.com:users/antoine-tenart/linux.git usb-phy
> 
> The series applies on top of Sergei and Yoshihiro generic PHY support in
> HCD[1].

For the changes to hub.c, hcd.c, and the ehci and ohci drivers:

Acked-by: Alan Stern <stern@...land.harvard.edu>

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