usb: mtu3: add support controller reset

Add support controller reset via a reset-controller usually in infracfg,
it's different with the software reset by IPPC which only used to reset MAC,
and it will also reset IPPC meanwhile.

Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Chunfeng Yun <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Chunfeng Yun

drivers/usb/mtu3/mtu3_plat.c

@@ -13,6 +13,7 @@
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/pm_wakeirq.h>
+#include <linux/reset.h>
 
 #include "mtu3.h"
 #include "mtu3_dr.h"
@@ -345,6 +346,12 @@ static int mtu3_probe(struct platform_device *pdev)
 		dev_info(dev, "wakeup irq %d\n", ssusb->wakeup_irq);
 	}
 
+	ret = device_reset_optional(dev);
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to reset controller\n");
+		goto comm_exit;
+	}
+
 	ssusb_ip_sw_reset(ssusb);
 
 	if (IS_ENABLED(CONFIG_USB_MTU3_HOST))