[U-Boot] usb: ehci: Take advantage of the new multi-controller feature for MXC

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

Hi Marek,

Thanks to Lucas' series coming with commits c7e3b2b and 676ae06, I'd like to use
the multi-controller feature on MXC since most of these SoCs come with a USB IP
supporting an OTG controller and multiple host-only controllers.

Currently the MXC code in ehci-mx{c|5|6}.c just ignores the index passed to
ehci_hcd_init() and the like, and there are 3 port-specific configs
(CONFIG_MXC_USB_PORT, CONFIG_MXC_USB_FLAGS and CONFIG_MXC_USB_PORTSC).

Not all USB ports from the USB IP will be available on each board for a given
SoC, so we need a logical to physical USB port mapping.

I would suggest something like the following.

board.h:
#define CONFIG_MXC_USB	{ \
	{ \
		0, \
		MXC_EHCI_INTERNAL_PHY, \
		MXC_EHCI_UTMI_16BIT | MXC_EHCI_MODE_UTMI \
	}, { \
		1, \
		MXC_EHCI_POWER_PINS_ENABLED | MXC_EHCI_PWR_PIN_ACTIVE_HIGH | \
		MXC_EHCI_OC_PIN_ACTIVE_LOW, \
		MXC_EHCI_MODE_ULPI \
	}, \
}

ehci-fsl.h:
struct mxc_ehci_cfg {
	int port;
	u32 flags;
	u32 portsc;
};

ehci-mx{c|5|6}.c:
static const struct mxc_ehci_cfg cfg[CONFIG_USB_MAX_CONTROLLER_COUNT] =
		CONFIG_MXC_USB;

Then, in ehci_hcd_init(), there would be the following replacements:
 - CONFIG_MXC_USB_PORT -> cfg[index].port,
 - CONFIG_MXC_USB_FLAGS -> cfg[index].flags,
 - CONFIG_MXC_USB_PORTSC -> cfg[index].portsc.

What do you think?

Best regards,
Beno?t