usb: dwc3: xilinx: add reset-controller support

Add a reset-controller for supporting Xilinx versal platforms. To reset
the USB controller, get the reset ID from device-tree and using ID trigger
the reset, with the assert and deassert reset controller APIs for USB
controller initialization.

Signed-off-by: Piyush Mehta <piyush.mehta@amd.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20231013125847.20334-1-piyush.mehta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
index 19307d24f3a06b75f20532522d42fed6ea350cea..5b7e92f476de928a6fe38e4494089b8c521b143d 100644 (file)
--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -32,9 +32,6 @@
 #define XLNX_USB_TRAFFIC_ROUTE_CONFIG          0x005C
 #define XLNX_USB_TRAFFIC_ROUTE_FPD             0x1
 
-/* Versal USB Reset ID */
-#define VERSAL_USB_RESET_ID                    0xC104036
-
 #define XLNX_USB_FPD_PIPE_CLK                  0x7c
 #define PIPE_CLK_DESELECT                      1
 #define PIPE_CLK_SELECT                                0
@@ -72,20 +69,23 @@ static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
 static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
 {
        struct device           *dev = priv_data->dev;
+       struct reset_control    *crst;
        int                     ret;
 
+       crst = devm_reset_control_get_exclusive(dev, NULL);
+       if (IS_ERR(crst))
+               return dev_err_probe(dev, PTR_ERR(crst), "failed to get reset signal\n");
+
        dwc3_xlnx_mask_phy_rst(priv_data, false);
 
        /* Assert and De-assert reset */
-       ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
-                                    PM_RESET_ACTION_ASSERT);
+       ret = reset_control_assert(crst);
        if (ret < 0) {
                dev_err_probe(dev, ret, "failed to assert Reset\n");
                return ret;
        }
 
-       ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
-                                    PM_RESET_ACTION_RELEASE);
+       ret = reset_control_deassert(crst);
        if (ret < 0) {
                dev_err_probe(dev, ret, "failed to De-assert Reset\n");
                return ret;