linux-kernel - Re: [PATCH 4/7] ECHI Platform: Merge ppc-of EHCI driver into the ehci-platform driver

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Date:	Sat, 22 Feb 2014 15:32:53 +1300
From:	Tony Prisk <linux@...sktech.co.nz>
To:	Mark Rutland <mark.rutland@....com>,
	Alistair Popple <alistair@...ple.id.au>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 4/7] ECHI Platform: Merge ppc-of EHCI driver into the
 ehci-platform driver


On 22/02/14 00:48, Mark Rutland wrote:
> [Adding Tony Prisk to Cc]
>
> On Fri, Feb 21, 2014 at 06:31:30AM +0000, Alistair Popple wrote:
>> Currently the ppc-of driver uses the compatibility string
>> "usb-ehci". This means platforms that use device-tree and implement an
>> EHCI compatible interface have to either use the ppc-of driver or add
>> a compatible line to the ehci-platform driver. It would be more
>> appropriate for the platform driver to be compatible with "usb-ehci"
>> as non-powerpc platforms are also beginning to utilise device-tree.
>>
>> This patch merges the device tree property parsing from ehci-ppc-of
>> into the platform driver and adds a "usb-ehci" compatibility
>> string. The existing ehci-ppc-of driver is removed and the 440EPX
>> specific quirks are added to the ehci-platform driver.
>>
>> Signed-off-by: Alistair Popple <alistair@...ple.id.au>
>> ---
>>   drivers/usb/host/Kconfig         |    7 +-
>>   drivers/usb/host/ehci-hcd.c      |    5 -
>>   drivers/usb/host/ehci-platform.c |   87 +++++++++++++-
>>   drivers/usb/host/ehci-ppc-of.c   |  238 --------------------------------------
>>   4 files changed, 89 insertions(+), 248 deletions(-)
>>   delete mode 100644 drivers/usb/host/ehci-ppc-of.c
> Please use of_property_read_bool for these.
>
> This driver already handles "via,vt8500-ehci" and "wm,prizm-ehci" which
> aren't documented to handle these properties, but now gain support for
> them. It might be worth unifying the binding documents if there's
> nothing special about those two host controllers.
>
> We seem to have two binding documents for "via,vt8500-ehci", so some
> cleanup is definitely in order.
>
> Tony, you seem to have written both documents judging by 95e9fd10f06c
> and 8ad551d150e3. Do you have any issue with merging both of these into
> a common usb-ehci document?
......
> Cheers,
> Mark.

I'm not sure how we ended up with two bindings for the driver anyway. I 
think this was an error on my part somewhere.

None of the in-tree dts files use "wm,prizm-ehci".

I have no issue with merging all the documentation into a single 
usb-ehci binding.

Regards
Tony Prisk
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