[U-Boot] [PATCH v2] usb: ehci-mx6: Fix bus enumeration for iMX7 SoCs

[Igor Opaniuk <igor.opaniuk@gmail.com>]

From: Igor Opaniuk <igor.opaniuk@toradex.com>

This fixes the issues with calculation of controller indexes in
ehci_usb_bind() for iMX7, as USB controllers on iMX7 SoCs aren't
placed next to each other, and their addresses incremented by 0x10000.

Example of USB nodes for iMX7S/D:

usbotg1: usb at 30b10000 {
    compatible = "fsl,imx7d-usb", "fsl,imx27-usb";
    reg = <0x30b10000 0x200>;
           ^^^^^^^^^^
....
usbotg2: usb at 30b20000 {
    compatible = "fsl,imx7d-usb", "fsl,imx27-usb";
    reg = <0x30b20000 0x200>;
           ^^^^^^^^^^
....

usbh: usb at 30b30000 {
    compatible = "fsl,imx7d-usb", "fsl,imx27-usb";
    reg = <0x30b30000 0x200>;
           ^^^^^^^^^^
....

Which was leading to usb enumeration issues:
Colibri iMX7 # usb start
starting USB...
Bus usb at 30b10000: USB EHCI 1.00
Bus usb at 30b20000: probe failed, error -22
scanning bus usb at 30b10000 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found

Fixes: 501547cec1("usb: ehci-mx6: Fix bus enumeration for DM case")
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
---

v2:
- removed ifdefs and used runtime check of SoC

 drivers/usb/host/ehci-mx6.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
index e9e6ed596d..7d46091f94 100644
--- a/drivers/usb/host/ehci-mx6.c
+++ b/drivers/usb/host/ehci-mx6.c
@@ -513,10 +513,11 @@ static int ehci_usb_bind(struct udevice *dev)
 	 * from which it derives offsets in the PHY and ANATOP register sets.
 	 *
 	 * Here we attempt to calculate these indexes from DT information as
-	 * well as we can. The USB controllers on all existing iMX6/iMX7 SoCs
-	 * are placed next to each other, at addresses incremented by 0x200.
-	 * Thus, the index is derived from the multiple of 0x200 offset from
-	 * the first controller address.
+	 * well as we can. The USB controllers on all existing iMX6 SoCs
+	 * are placed next to each other, at addresses incremented by 0x200,
+	 * and iMX7 their addresses are shifted by 0x10000.
+	 * Thus, the index is derived from the multiple of 0x200 (0x10000 for
+	 * iMX7) offset from the first controller address.
 	 *
 	 * However, to complete conversion of this driver to DT probing, the
 	 * following has to be done:
@@ -531,10 +532,10 @@ static int ehci_usb_bind(struct udevice *dev)
 	 * With these changes in place, the ad-hoc indexing goes away and
 	 * the driver is fully converted to DT probing.
 	 */
-	fdt_size_t size;
-	fdt_addr_t addr = devfdt_get_addr_size_index(dev, 0, &size);
+	u32 controller_spacing = is_mx7() ? 0x10000 : 0x200;
+	fdt_addr_t addr = devfdt_get_addr_index(dev, 0);
 
-	dev->req_seq = (addr - USB_BASE_ADDR) / size;
+	dev->req_seq = (addr - USB_BASE_ADDR) / controller_spacing;
 
 	return 0;
 }
-- 
2.17.1