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usb: ehci-mx6: Enable OTG detection on imx8mm and imx8mn

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The imx8mm and imx8mn appear compatible with imx7d-usb
flags in the OTG driver.  If the dr_mode is defined as
host or peripheral, the device appears to operate correctly,
however the auto host/peripheral detection results in an error.

The solution isn't just adding checks for imx8mm and imx8mn to
the check for imx7, because the USB clock needs to be running
to read from the USBNC_PHY_STATUS_OFFSET register or it will hang.

Marek requested that I not enable the clocks in ehci_usb_of_to_plat,
so I modified that function to return an unknown state if the
device tree does not explicitly state whether it is a host
or a peripheral.

When the driver probes, it looks to see if it's in the unknown
state, and only then will it read the register to auto-detect.

Signed-off-by: Adam Ford <aford173@gmail.com>
Tested-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Adam Ford 2022-02-03 15:20:11 -06:00 • committed by Marek Vasut
parent 2ccd2bc8c3
commit 078dfef931
2 changed files with 20 additions and 6 deletions
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3
include/usb.h
View file

@ -163,7 +163,8 @@ struct int_queue;
*/
enum usb_init_type {
USB_INIT_HOST,
USB_INIT_DEVICE
USB_INIT_DEVICE,
USB_INIT_UNKNOWN,
};
/**********************************************************************