I tested Linaro 13.04 kernel on my Exynos5250 and found that USB device is not found (i.e. nothing in lsusb). It used to work with Linaro 13.01. dmesg showed that s3c-usbphy can’t configure phy mode (see below). Looking at the samsung-usbphy.c file, it looks like sysreg is not defined in device tree file. I am thinking that we are missing one parameter for usbphy-sys in the exynos5250.dtsi, by comparing a patch from http://comments.gmane.org/gmane.linux.usb.general/82597.

Any comment?

        usbphy {

                #address-cells = <1>;

                #size-cells = <1>;

                compatible = "samsung,exynos5250-usbphy";

                reg = <0x12130000 0x100>, <0x12100000 0x100>;

                ranges;

                usbphy-sys {

                        /* USB device and host PHY_CONTROL registers */

                        reg = <0x10040704 0x8>;

                };

        };

-Wei

=== dmesg ===

samsung-usbphy s3c-usbphy: Can't get usb-phy sysreg cfg register

samsung-usbphy s3c-usbphy: Can't configure specified phy mode

samsung-usbphy s3c-usbphy: Can't configure specified phy mode

samsung-usbphy s3c-usbphy: Already power on PHY

samsung-usbphy s3c-usbphy: Can't configure specified phy mode

samsung-usbphy s3c-usbphy: Already power on PHY

=== code snip from samsung-usbphy.c ===

       /*

         * Not returning error code here, since this situation is not fatal.

         * Few SoCs may not have this switch available

         */

        if (sphy->sysreg == NULL)

                dev_warn(sphy->dev, "Can't get usb-phy sysreg cfg register\n");