[PATCH v3 05/13] usb: common: add helper to get role-switch-default-mode

From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Rob Herring <robh+dt@kernel.org>, Felipe Balbi <balbi@kernel.org>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	<linux-usb@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	Yuwen Ng <yuwen.ng@mediatek.com>,
	Eddie Hung <eddie.hung@mediatek.com>
Subject: [PATCH v3 05/13] usb: common: add helper to get role-switch-default-mode
Date: Thu, 15 Jul 2021 17:07:50 +0800	[thread overview]
Message-ID: <1626340078-29111-6-git-send-email-chunfeng.yun@mediatek.com> (raw)
In-Reply-To: <1626340078-29111-1-git-send-email-chunfeng.yun@mediatek.com>

Add helper to get "role-switch-default-mode", and convert it
to the corresponding enum usb_dr_mode

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2~3: no changes
---
 drivers/usb/common/common.c | 20 ++++++++++++++++++++
 include/linux/usb/otg.h     |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 347fb3d3894a..c9bdeb4ddcb5 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -200,6 +200,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(usb_get_dr_mode);
 
+/**
+ * usb_get_role_switch_default_mode - Get default mode for given device
+ * @dev: Pointer to the given device
+ *
+ * The function gets string from property 'role-switch-default-mode',
+ * and returns the corresponding enum usb_dr_mode.
+ */
+enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev)
+{
+	const char *str;
+	int ret;
+
+	ret = device_property_read_string(dev, "role-switch-default-mode", &str);
+	if (ret < 0)
+		return USB_DR_MODE_UNKNOWN;
+
+	return usb_get_dr_mode_from_string(str);
+}
+EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode);
+
 /**
  * usb_decode_interval - Decode bInterval into the time expressed in 1us unit
  * @epd: The descriptor of the endpoint
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 7ceeecbb9e02..6475f880be37 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -128,5 +128,6 @@ enum usb_dr_mode {
  * and returns the corresponding enum usb_dr_mode
  */
 extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
+extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev);
 
 #endif /* __LINUX_USB_OTG_H */
-- 
2.18.0

