[PATCH,RFC] usb: add devicetree helpers for determining dr_mode and phy_type

kishon kishon at ti.com
Wed Jan 30 05:31:05 EST 2013


On Wednesday 30 January 2013 03:41 PM, Sascha Hauer wrote:
> On Wed, Jan 30, 2013 at 11:21:35AM +0530, kishon wrote:
>> On Wednesday 30 January 2013 02:00 AM, Sascha Hauer wrote:
>>> On Tue, Jan 29, 2013 at 07:14:51PM +0530, kishon wrote:
>>>> Hi,
>>>> On Tuesday 29 January 2013 04:52 PM, Sascha Hauer wrote:
>>>>> From: Michael Grzeschik <m.grzeschik at pengutronix.de>
>>>>> This adds two little devicetree helper functions for determining the
>>>>> dr_mode (host, peripheral, otg) and phy_type (utmi, ulpi,...) from
>>>>> the devicetree.
>>>>> Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>
>>>>> Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
>>>>> ---
>>>>> The properties and their values have been taken from the fsl-mph-dr driver.
>>>>> This binding is also documented (though currently not used) for the tegra
>>>>> ehci driver (Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt).
>>>>> This is a first attempt to parse these bindings at a common place so that
>>>>> others can make use of it.
>>>>> Basically I want to know whether this binding is recommended for new drivers
>>>>> since normally the devicetree uses '-' instead of '_', and maybe there are
>>>>> other problems with it.
>>>>> I need this binding for the chipidea driver. I suspect that the fsl-mph-dr
>>>>> driver also really handles a chipidea core.
>>>>> Should we agree on this I would convert the fsl-mph-dr driver to use these
>>>>> helpers.
>>>>> Sascha
>>>>>   drivers/usb/core/Makefile |    1 +
>>>>>   drivers/usb/core/of.c     |   76 +++++++++++++++++++++++++++++++++++++++++++++
>>>> This file should ideally go into drivers/usb/phy/.
>>> I originally wanted to do that, but the host/peripheral/otg property is
>>> not phy specific. DO you still want to move it there?
>> I think then you can just move of_usb_get_phy_mode() to phy/of.c.
>> Then we can also move some functions defined in otg.c (specific to
>> PHY and dt) to phy/of.c.
> The phy specific stuff in otg.c can't easily be moved as all functions
> operate on a static list and spinlock. Also nothing in otg/otg.c is
> currently of specific.

Actually nothing in otg.c is specific to OTG except one function 
otg_state_string(). So we should ideally have all the list and spinlock 
stuff be moved to phy.c

Some of them got added recently (like devm_usb_get_phy_by_phandle). It 
should be in 
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next
> What about the dr_mode helper? Moving it to otg/ would mean that all

*dr_mode* doesn't look like it should be in phy/ or otg/. You can keep 
it as is in core/of.c


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