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 <angelogioacchino.delregno@collabora.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220523090449.14430-4-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index 4309ed9..d14494b 100644 (file)
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/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))