linux-kernel - [PATCH 4/4] usb: mtu3: add support controller reset

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Message-ID: <20220523090449.14430-4-chunfeng.yun@mediatek.com>
Date:   Mon, 23 May 2022 17:04:49 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Mathias Nyman" <mathias.nyman@...el.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: [PATCH 4/4] 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.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/mtu3/mtu3_plat.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index 4309ed939178..d14494b30064 100644
--- 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))
-- 
2.18.0