linux-kernel - Re: [PATCH] phy: Add a driver for dm816x USB PHY

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Message-ID: <CADYTM3bGM2BhRN=PZozpHcDYSsHbkgY2fsXuxDYMsixSh8R_Zw@mail.gmail.com>
Date:	Mon, 9 Mar 2015 16:31:51 -0500
From:	Bin Liu <binmlist@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	balbi@...com, Kishon Vijay Abraham I <kishon@...com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-usb <linux-usb@...r.kernel.org>,
	Brian Hutchinson <b.hutchman@...il.com>
Subject: Re: [PATCH] phy: Add a driver for dm816x USB PHY

On Mon, Mar 9, 2015 at 4:20 PM, Tony Lindgren <tony@...mide.com> wrote:
> * Bin Liu <binmlist@...il.com> [150309 14:17]:
>> On Mon, Mar 9, 2015 at 4:13 PM, Felipe Balbi <balbi@...com> wrote:
>> > On Mon, Mar 09, 2015 at 04:11:28PM -0500, Bin Liu wrote:
>> >> Hi,
>> >>
>> >> On Mon, Mar 9, 2015 at 3:51 PM, Tony Lindgren <tony@...mide.com> wrote:
>> >> > Add a minimal driver for dm816x USB. Otherwise we can just use
>> >> > the existing musb_am335x and musb_dsps on dm816x.
>> >>
>> >> dm816x has the almost identical usbss as that in am335x, we should be
>> >> able to adopt musb_am335x and musb_dsps for dm816x, and dm814x too?
>> >
>> > Tony's using the same musb glue layers, this is just a phy driver,
>> > right ?
>>
>> Can the current am335x phy driver be adopted too? I remember it is
>> under drivers/usb/phy/.
>
> Yes this is just the phy, other than that things work the same.
>
> I believe this is different from the am335x phy, and more similar to
> what we have in old drivers/usb/musb/davinci.c. Chances are dm814x
> is same as am335x phy.

Alright, I only played the dm814x board a few times, but never with
dm816x, and thought dm816x and dm814x usbss are the same and very
close to am335x - am335x came out later than dm81xx and has some
improvement in usbss.

>
> But yeah, we really should do a proper phy driver for am335x too
> along the same lines. Might even be be able to combine those drivers
> with just different compatible values to set the quirks and the
> enable/disable functions.

Ok, I agreed we can make dm816x working first, then gradually move
am335x aligned to the framework.

Regards,
-Bin.

>
> Regards,
>
> Tony
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