[PATCH v6 1/3] USB: chipidea: add imx usbmisc support

On Wed, Aug 29, 2012 at 01:18:10PM +0300, Alexander Shishkin wrote:

Sascha Hauer [off-list ref] writes:

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On Wed, Aug 29, 2012 at 10:50:08AM +0300, Alexander Shishkin wrote:

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Richard Zhao [off-list ref] writes:

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i.MX usb controllers shares non-core registers, which may include
SoC specific controls. We take it as a usbmisc device and usbmisc
driver set operations needed by ci13xxx_imx driver.

For example, Sabrelite board has bad over-current design, we can
usbmisc to disable over-current detect.

Why does this have to be part of the usb driver instead of SoC specific
code? It looks like you've created a whole new device/driver
infrastructure just to disable overcurrent for a specific board.

Richards code indeed only handles overcurrent for a specific board, but
there are more bits to configure in the longer run: power pin
polarities, ULPI/serial mode select and some more.

Sounds to me like these things that should be taken care of by the phy
driver, which will likely be simpler from both driver's and devicetree's
perspective.

No, it's controlled by a set of usb misc registers, which is not in phy
IP or usb controller IP.

Thanks
Richard

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And the infrastructure boils down to a complex way of passing a callback
from imx driver to another imx driver, that only works if they are
probed in the right order. I don't see any point in doing it like this
other than inflating the device tree tables even further.

Why can't this be part of the SoC code like it is done, for example in
arch/arm/mach-omap2/control.c?

The settings are board specific, so there must be some way to configure
them in the devicetree.

But I'm sure there's a way to control board-specific settings/kludges
from devicetree?

Regards,
--
Alex