Re: Creating a new xhci-hcd platform device

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Hello everyone

I want to ask your advice on the best approach for implementing a new
XHCI host controller.
I am going to add Linux support for a new XHCI host controller for Marvell SOCs.

I looked around the latest XHCI support code in the kernel and found
that a platform driver called “xhci-hcd” exists.

And there is also one XHCI device (DRD dwc3 used by Samsung and TI)
that bounds to this driver.

My case is somewhat simpler than the dwc3 since it’s not a Dual Role Device.
Basically I need to initialize some SOC level registers and then
register an xhci-hcd device. Also I need to implement suspend/resume
hooks to save and restore the SOC registers initialized at the probe
function.

I was thinking to take the following approach:

1.  Under drivers/usb/host - Register a new platform driver called
“xhci-mv” which will initialize the SOC specific stuff and register an
“xhci-hcd” platform device.

2. In the machine code – Register an “xhci-mv” platform device and
initialize its resources based on device tree.

I appreciate any input or comment

Thanks in advance

Yehuda Yitschak
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