Commit de7ecc4e authored by Piyush Mehta's avatar Piyush Mehta Committed by Greg Kroah-Hartman
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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: default avatarPiyush Mehta <piyush.mehta@amd.com>
Acked-by: default avatarThinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20231013125847.20334-1-piyush.mehta@amd.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 46b6fc53

drivers/usb/dwc3/dwc3-xilinx.c

+7 −7
Original line number Diff line number Diff line
@@ -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;