[PATCH next v10 00/11] add USB GPIO based connection detection driver

[PATCH next v10 00/11] add USB GPIO based connection detection driver

[Chunfeng Yun]

Because the USB Connector is introduced and the requirement of
usb-connector.txt binding, the old way using extcon to support
USB Dual-Role switch is now deprecated, meanwhile there is no
available common driver when use Type-B connector, typically
using an input GPIO to detect USB ID pin.
This patch series introduce a USB GPIO based connection detection
driver and try to replace the function provided by extcon-usb-gpio
driver.

v10 changes:
  1. revert commit log changes of [06/11] and [07/11]

v9 changes:
  1. replace signed-off-by by suggested-by Heikki
  2. add reviewed-by Linus
  3. use class_find_device_by_fwnode() introduced by series [1]

[1]:
 https://lore.kernel.org/patchwork/patch/1103630/
 [v3,1/7] drivers: Introduce device lookup variants by name

 they are already in:
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/log/drivers/base/core.c?h=driver-core-next

v8 changes:
  1. rename the driver's name suggested by Heikki
  2. move the driver from usb/roles/ into usb/common/ suggested by Heikki
  3. introduce Kconfig for usb common core to add the new driver
  4. modify binding of the driver 
  5. rename the subject title

v7 changes:
  1. [5/10]: add signed-off-by Chunfeng
  2. [6/10]: add signed-off-by Chunfeng
  3. [6/10]: depends on linux-next of Rafael's tree [1]
  4. [7/10]: add signed-off-by Chunfeng and tested-by Biju
  5. [9/10]: add tested-by Nagarjuna, and remove DEV_PMS_OPS suggested by Andy

[1] https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/log/?h=linux-next

v6 changes:
  1. merge [1] and [2] into this series
  2. don't use graph anymore to find usb-role-switch
  3. abandon [3] and introduce three patches (6, 7, 8 in this series)
     to rebuild APIs getting usb-role-switch

  [1]: [v3] dt-binding: usb: add usb-role-switch property
       https://patchwork.kernel.org/patch/10934835/
  [2]: [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
       https://patchwork.kernel.org/patch/10909971/

  [3]: [PATCH v5 4/6] usb: roles: add API to get usb_role_switch by node

v5 changes:
  1. remove linux/of.h and put usb_role_switch when error happens,
     suggested by Biju
  2. treat Type-B connector as USB controller's child, but not as
     a virtual device, suggested by Rob
  3. provide and use generic property "usb-role-switch", see [1],
     suggested by Rob

  Note: this series still depends on [2]

  [1]: [v3] dt-binding: usb: add usb-role-switch property
       https://patchwork.kernel.org/patch/10934835/
  [2]: [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
       https://patchwork.kernel.org/patch/10909971/

v4 changes:
  1. use switch_fwnode_match() to find fwnode suggested by Heikki
  2. assign fwnode member of usb_role_switch struct suggested by Heikki
  3. make [4/6] depend on [2]
  3. remove linux/gpio.h suggested by Linus
  4. put node when error happens

  [4/6] usb: roles: add API to get usb_role_switch by node
  [2] [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
    https://patchwork.kernel.org/patch/10909971/

v3 changes:
  1. add GPIO direction, and use fixed-regulator for GPIO controlled
    VBUS regulator suggested by Rob;
  2. rebuild fwnode_usb_role_switch_get() suggested by Andy and Heikki
  3. treat the type-B connector as a virtual device;
  4. change file name of driver again
  5. select USB_ROLE_SWITCH in mtu3/Kconfig suggested by Heikki
  6. rename ssusb_mode_manual_switch() to ssusb_mode_switch()

v2 changes:
 1. make binding clear, and add a extra compatible suggested by Hans

Chunfeng Yun (8):
  dt-binding: usb: add usb-role-switch property
  dt-bindings: connector: add optional properties for Type-B
  dt-bindings: usb: add binding for USB GPIO based connection detection
    driver
  dt-bindings: usb: mtu3: add properties about USB Role Switch
  usb: roles: get usb-role-switch from parent
  usb: common: create Kconfig file
  usb: common: add USB GPIO based connection detection driver
  usb: mtu3: register a USB Role Switch for dual role mode

Heikki Krogerus (2):
  device connection: Add fwnode_connection_find_match()
  usb: roles: Add fwnode_usb_role_switch_get() function

Yu Chen (1):
  usb: roles: Introduce stubs for the exiting functions in role.h

 .../bindings/connector/usb-connector.txt      |  14 +
 .../devicetree/bindings/usb/generic.txt       |   4 +
 .../devicetree/bindings/usb/mediatek,mtu3.txt |  10 +
 .../devicetree/bindings/usb/usb-conn-gpio.txt |  31 ++
 drivers/base/devcon.c                         |  43 ++-
 drivers/usb/Kconfig                           |  35 +--
 drivers/usb/common/Kconfig                    |  51 ++++
 drivers/usb/common/Makefile                   |   1 +
 drivers/usb/common/usb-conn-gpio.c            | 284 ++++++++++++++++++
 drivers/usb/mtu3/Kconfig                      |   1 +
 drivers/usb/mtu3/mtu3.h                       |   5 +
 drivers/usb/mtu3/mtu3_debugfs.c               |   4 +-
 drivers/usb/mtu3/mtu3_dr.c                    |  48 ++-
 drivers/usb/mtu3/mtu3_dr.h                    |   6 +-
 drivers/usb/mtu3/mtu3_plat.c                  |   3 +-
 drivers/usb/roles/class.c                     |  41 ++-
 include/linux/device.h                        |  10 +-
 include/linux/usb/role.h                      |  37 +++
 18 files changed, 570 insertions(+), 58 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
 create mode 100644 drivers/usb/common/Kconfig
 create mode 100644 drivers/usb/common/usb-conn-gpio.c

-- 
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[PATCH next v10 01/11] dt-binding: usb: add usb-role-switch property

[Chunfeng Yun]

Add a property usb-role-switch to tell the driver that use
USB Role Switch framework to handle the role switch,
it's useful when the driver has already supported other ways,
such as extcon framework etc.

Cc: Biju Das <biju.das@bp.renesas.com>
Cc: Yu Chen <chenyu56@huawei.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
v7~v10: no changes

v6:
    1. merge into this series patch
    2. add Reviewed-by

(no v4, v5)

v3:
    add property type, modify description suggested by Heikki

v2:
    describe it in terms of h/w functionality suggested by Rob

v1:
    the property is discussed in:
    [v2,2/7] dt-bindings: usb: renesas_usb3: add usb-role-switch property
    https://patchwork.kernel.org/patch/10852497/

    Mediatek and Hisilicon also try to use it:
    [v4,3/6] dt-bindings: usb: mtu3: add properties about USB Role Switch
    https://patchwork.kernel.org/patch/10918385/
    [v4,6/6] usb: mtu3: register a USB Role Switch for dual role mode
    https://patchwork.kernel.org/patch/10918367/

    [v6,10/13] usb: dwc3: Registering a role switch in the DRD code
    https://patchwork.kernel.org/patch/10909981/
---
 Documentation/devicetree/bindings/usb/generic.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index 0a74ab8dfdc2..cf5a1ad456e6 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -30,6 +30,10 @@ Optional properties:
 			optional for OTG device.
  - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
 			optional for OTG device.
+ - usb-role-switch: boolean, indicates that the device is capable of assigning
+			the USB data role (USB host or USB device) for a given
+			USB connector, such as Type-C, Type-B(micro).
+			see connector/usb-connector.txt.
 
 This is an attribute to a USB controller such as:
 
-- 
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[PATCH next v10 02/11] dt-bindings: connector: add optional properties for Type-B

[Chunfeng Yun]

Add id-gpios, vbus-gpios, vbus-supply and pinctrl properties for
usb-b-connector

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
v6~v10 no changes

v5 changes:
 1. add reviewed by Rob

v4 no changes

v3 changes:
 1. add GPIO direction, and use fixed-regulator for GPIO controlled
    VBUS regulator suggested by Rob;

v2 changes:
 1. describe more clear for vbus-gpios and vbus-supply suggested by Hans
---
 .../bindings/connector/usb-connector.txt           | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
index cef556d4e5ee..d357987181ee 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.txt
+++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
@@ -17,6 +17,20 @@ Optional properties:
 - self-powered: Set this property if the usb device that has its own power
   source.
 
+Optional properties for usb-b-connector:
+- id-gpios: an input gpio for USB ID pin.
+- vbus-gpios: an input gpio for USB VBUS pin, used to detect presence of
+  VBUS 5V.
+  see gpio/gpio.txt.
+- vbus-supply: a phandle to the regulator for USB VBUS if needed when host
+  mode or dual role mode is supported.
+  Particularly, if use an output GPIO to control a VBUS regulator, should
+  model it as a regulator.
+  see regulator/fixed-regulator.yaml
+- pinctrl-names : a pinctrl state named "default" is optional
+- pinctrl-0 : pin control group
+  see pinctrl/pinctrl-bindings.txt
+
 Optional properties for usb-c-connector:
 - power-role: should be one of "source", "sink" or "dual"(DRP) if typec
   connector has power support.
-- 
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[PATCH next v10 03/11] dt-bindings: usb: add binding for USB GPIO based connection detection driver

[Chunfeng Yun]

It's used to support dual role switch via GPIO when use Type-B
receptacle, typically the USB ID pin is connected to an input
GPIO, and also used to enable/disable device when the USB Vbus
pin is connected to an input GPIO.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v9~v10 no changes

v8 changes:
 1. rename the title
 2. change the compatible as "linux,usb-conn-gpio" instead of
    "linux,typeb-conn-gpio"

v7 changes:
 1. add description for device only mode

v6 changes:
 1. remove status and port nodes in example
 2. make vbus-supply as optional property

v5 changes:
 1. treat type-B connector as child device of USB controller's, but not
    as a separate virtual device, suggested by Rob
 2. put connector's port node under connector node, suggested by Rob

v4 no changes

v3 changes:
 1. treat type-B connector as a virtual device, but not child device of
    USB controller's

v2 changes:
  1. new patch to make binding clear suggested by Hans
---
 .../devicetree/bindings/usb/usb-conn-gpio.txt | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt

diff --git a/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
new file mode 100644
index 000000000000..d4d107fedc22
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
@@ -0,0 +1,31 @@
+USB GPIO Based Connection Detection
+
+This is typically used to switch dual role mode from the USB ID pin connected
+to an input GPIO, and also used to enable/disable device mode from the USB
+Vbus pin connected to an input GPIO.
+
+Required properties:
+- compatible : should include "linux,usb-conn-gpio" and "usb-b-connector".
+- id-gpios, vbus-gpios : input gpios, either one of them must be present,
+	and both can be present as well.
+	see connector/usb-connector.txt
+
+Optional properties:
+- vbus-supply : can be present if needed when supports dual role mode.
+	see connector/usb-connector.txt
+
+- Sub-nodes:
+	- port : can be present.
+		see graph.txt
+
+Example:
+
+&mtu3 {
+	connector {
+		compatible = "linux,usb-conn-gpio", "usb-b-connector";
+		label = "micro-USB";
+		type = "micro";
+		id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
+		vbus-supply = <&usb_p0_vbus>;
+	};
+};
-- 
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[PATCH next v10 04/11] dt-bindings: usb: mtu3: add properties about USB Role Switch

[Chunfeng Yun]

Now the USB Role Switch is supported, so add properties about it,
and modify some description related.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
v6~v10 no changes

v5 changes:
 1. modify decription about extcon and vbus-supply properties
 2. make this patch depend on [1]

 [1]: [v3] dt-binding: usb: add usb-role-switch property
      https://patchwork.kernel.org/patch/10934835/

v4 no changes
v3 no changes

v2 changes:
  1. fix typo
  2. refer new binding about connector property
---
 .../devicetree/bindings/usb/mediatek,mtu3.txt          | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
index 3382b5cb471d..3a8300205cdb 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
@@ -28,8 +28,13 @@ Optional properties:
 	parent's address space
  - extcon : external connector for vbus and idpin changes detection, needed
 	when supports dual-role mode.
+	it's considered valid for compatibility reasons, not allowed for
+	new bindings, and use "usb-role-switch" property instead.
  - vbus-supply : reference to the VBUS regulator, needed when supports
 	dual-role mode.
+	it's considered valid for compatibility reasons, not allowed for
+	new bindings, and put into a usb-connector node.
+	see connector/usb-connector.txt.
  - pinctrl-names : a pinctrl state named "default" is optional, and need be
 	defined if auto drd switch is enabled, that means the property dr_mode
 	is set as "otg", and meanwhile the property "mediatek,enable-manual-drd"
@@ -39,6 +44,8 @@ Optional properties:
 
  - maximum-speed : valid arguments are "super-speed", "high-speed" and
 	"full-speed"; refer to usb/generic.txt
+ - usb-role-switch : use USB Role Switch to support dual-role switch, but
+	not extcon; see usb/generic.txt.
  - enable-manual-drd : supports manual dual-role switch via debugfs; usually
 	used when receptacle is TYPE-A and also wants to support dual-role
 	mode.
@@ -61,6 +68,9 @@ The xhci should be added as subnode to mtu3 as shown in the following example
 if host mode is enabled. The DT binding details of xhci can be found in:
 Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
 
+The port would be added as subnode if use "usb-role-switch" property.
+	see graph.txt
+
 Example:
 ssusb: usb@11271000 {
 	compatible = "mediatek,mt8173-mtu3";
-- 
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[PATCH next v10 05/11] usb: roles: Introduce stubs for the exiting functions in role.h

[Chunfeng Yun]

From: Yu Chen <chenyu56@huawei.com>

This patch adds stubs for the exiting functions while
CONFIG_USB_ROLE_SWITCH does not enabled.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v8~v10 no changes

v7:
  add Signed-off-by Chunfeng

v6:
  merge this patch [1] into this series to add new API

	[1] https://patchwork.kernel.org/patch/10909971/
---
 include/linux/usb/role.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index c05ffa6abda9..da2b9641b877 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -42,6 +42,8 @@ struct usb_role_switch_desc {
 	bool allow_userspace_control;
 };
 
+
+#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
 int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
 struct usb_role_switch *usb_role_switch_get(struct device *dev);
@@ -51,5 +53,33 @@ struct usb_role_switch *
 usb_role_switch_register(struct device *parent,
 			 const struct usb_role_switch_desc *desc);
 void usb_role_switch_unregister(struct usb_role_switch *sw);
+#else
+static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
+		enum usb_role role)
+{
+	return 0;
+}
+
+static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
+{
+	return USB_ROLE_NONE;
+}
+
+static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
+
+static inline struct usb_role_switch *
+usb_role_switch_register(struct device *parent,
+			 const struct usb_role_switch_desc *desc)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
+#endif
 
 #endif /* __LINUX_USB_ROLE_H */
-- 
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[PATCH next v10 06/11] device connection: Add fwnode_connection_find_match()

[Chunfeng Yun]

From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

The fwnode_connection_find_match() function is exactly the
same as device_connection_find_match(), except it takes
struct fwnode_handle as parameter instead of struct device.
That allows locating device connections before the device
entries have been created.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v10:
  revert changes of v9

v9:
  replace signed-off-by by suggested-by Heikki

v8: no changes

v7:
  rebased on Rafael's tree [1] (after rc4), provided by Heikki

[1] https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/log/?h=linux-next

v6:
  new patch
---
 drivers/base/devcon.c  | 43 ++++++++++++++++++++++++++++++------------
 include/linux/device.h | 10 +++++++---
 2 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 1d488dc5dd0c..14e2178e09f8 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -12,9 +12,6 @@
 static DEFINE_MUTEX(devcon_lock);
 static LIST_HEAD(devcon_list);
 
-typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
-				   void *data);
-
 static void *
 fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
 			  void *data, devcon_match_fn_t match)
@@ -60,6 +57,34 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
 	return NULL;
 }
 
+/**
+ * fwnode_connection_find_match - Find connection from a device node
+ * @fwnode: Device node with the connection
+ * @con_id: Identifier for the connection
+ * @data: Data for the match function
+ * @match: Function to check and convert the connection description
+ *
+ * Find a connection with unique identifier @con_id between @fwnode and another
+ * device node. @match will be used to convert the connection description to
+ * data the caller is expecting to be returned.
+ */
+void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
+				   const char *con_id, void *data,
+				   devcon_match_fn_t match)
+{
+	void *ret;
+
+	if (!fwnode || !match)
+		return NULL;
+
+	ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
+	if (ret)
+		return ret;
+
+	return fwnode_devcon_match(fwnode, con_id, data, match);
+}
+EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
+
 /**
  * device_connection_find_match - Find physical connection to a device
  * @dev: Device with the connection
@@ -83,15 +108,9 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
 	if (!match)
 		return NULL;
 
-	if (fwnode) {
-		ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
-		if (ret)
-			return ret;
-
-		ret = fwnode_devcon_match(fwnode, con_id, data, match);
-		if (ret)
-			return ret;
-	}
+	ret = fwnode_connection_find_match(fwnode, con_id, data, match);
+	if (ret)
+		return ret;
 
 	mutex_lock(&devcon_lock);
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 8ae3f4b47293..93626476c9ae 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1009,10 +1009,14 @@ struct device_connection {
 	struct list_head	list;
 };
 
+typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
+				   void *data);
+
+void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
+				   const char *con_id, void *data,
+				   devcon_match_fn_t match);
 void *device_connection_find_match(struct device *dev, const char *con_id,
-				void *data,
-				void *(*match)(struct device_connection *con,
-					       int ep, void *data));
+				   void *data, devcon_match_fn_t match);
 
 struct device *device_connection_find(struct device *dev, const char *con_id);
 
-- 
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[PATCH next v10 07/11] usb: roles: Add fwnode_usb_role_switch_get() function

[Chunfeng Yun]

From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

The fwnode_usb_role_switch_get() function is exactly the
same as usb_role_switch_get(), except that it takes struct
fwnode_handle as parameter instead of struct device.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Biju Das <biju.das@bp.renesas.com>
---
v10:
  revert changes of v9

v9:
 replace signed-off-by by suggested-by Heikki

v8: no changes

v7: 
 add signed-off-by Chunfeng and tested-by Biju

v6:
  new patch
---
 drivers/usb/roles/class.c | 20 ++++++++++++++++++++
 include/linux/usb/role.h  |  7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 0526efbc4922..2abb6fe384ca 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -123,6 +123,26 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get);
 
+/**
+ * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
+ * @fwnode: The caller device node
+ *
+ * This is similar to the usb_role_switch_get() function above, but it searches
+ * the switch using fwnode instead of device entry.
+ */
+struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+	struct usb_role_switch *sw;
+
+	sw = fwnode_connection_find_match(fwnode, "usb-role-switch", NULL,
+					  usb_role_switch_match);
+	if (!IS_ERR_OR_NULL(sw))
+		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
+
+	return sw;
+}
+EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
+
 /**
  * usb_role_switch_put - Release handle to a switch
  * @sw: USB Role Switch
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index da2b9641b877..2d77f97df72d 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -47,6 +47,7 @@ struct usb_role_switch_desc {
 int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
 struct usb_role_switch *usb_role_switch_get(struct device *dev);
+struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
 void usb_role_switch_put(struct usb_role_switch *sw);
 
 struct usb_role_switch *
@@ -70,6 +71,12 @@ static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *node)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
 
 static inline struct usb_role_switch *
-- 
2.23.0


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[PATCH next v10 08/11] usb: roles: get usb-role-switch from parent

[Chunfeng Yun]

when the USB host controller is the parent of the connector,
usually type-B, sometimes don't need the graph, so we should
check whether it's parent registers usb-role-switch or not
firstly, and get it if exists.

Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v10: no changes

v9:
  1. replace signed-off-by by suggested-by Heikki
  2. use class_find_device_by_fwnode()

v8: no changes
v7:
  add signed-off-by Chunfeng

v6:
  new patch
---
 drivers/usb/roles/class.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 2abb6fe384ca..94b4e7db2b94 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -102,6 +102,19 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
 }
 
+static struct usb_role_switch *
+usb_role_switch_is_parent(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *parent = fwnode_get_parent(fwnode);
+	struct device *dev;
+
+	if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
+		return NULL;
+
+	dev = class_find_device_by_fwnode(role_class, parent);
+	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
+}
+
 /**
  * usb_role_switch_get - Find USB role switch linked with the caller
  * @dev: The caller device
@@ -113,8 +126,10 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev)
 {
 	struct usb_role_switch *sw;
 
-	sw = device_connection_find_match(dev, "usb-role-switch", NULL,
-					  usb_role_switch_match);
+	sw = usb_role_switch_is_parent(dev_fwnode(dev));
+	if (!sw)
+		sw = device_connection_find_match(dev, "usb-role-switch", NULL,
+						  usb_role_switch_match);
 
 	if (!IS_ERR_OR_NULL(sw))
 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
@@ -134,8 +149,10 @@ struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
 {
 	struct usb_role_switch *sw;
 
-	sw = fwnode_connection_find_match(fwnode, "usb-role-switch", NULL,
-					  usb_role_switch_match);
+	sw = usb_role_switch_is_parent(fwnode);
+	if (!sw)
+		sw = fwnode_connection_find_match(fwnode, "usb-role-switch",
+						  NULL, usb_role_switch_match);
 	if (!IS_ERR_OR_NULL(sw))
 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
 
-- 
2.23.0


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[PATCH next v10 09/11] usb: common: create Kconfig file

[Chunfeng Yun]

Create Kconfig file for USB common core, and move USB_LED_TRIG
and USB_ULPI_BUS configs into the new file from the parent Kconfig,
it will help to add new configs later.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v9~v10: no changes

v8:
  new patch
---
 drivers/usb/Kconfig        | 35 +----------------------------------
 drivers/usb/common/Kconfig | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 34 deletions(-)
 create mode 100644 drivers/usb/common/Kconfig

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 6e59d370ef81..7bf94e65ed2f 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -36,8 +36,7 @@ menuconfig USB_SUPPORT
 
 if USB_SUPPORT
 
-config USB_COMMON
-	tristate
+source "drivers/usb/common/Kconfig"
 
 config USB_ARCH_HAS_HCD
 	def_bool y
@@ -175,36 +174,4 @@ source "drivers/usb/typec/Kconfig"
 
 source "drivers/usb/roles/Kconfig"
 
-config USB_LED_TRIG
-	bool "USB LED Triggers"
-	depends on LEDS_CLASS && LEDS_TRIGGERS
-	select USB_COMMON
-	help
-	  This option adds LED triggers for USB host and/or gadget activity.
-
-	  Say Y here if you are working on a system with led-class supported
-	  LEDs and you want to use them as activity indicators for USB host or
-	  gadget.
-
-config USB_ULPI_BUS
-	tristate "USB ULPI PHY interface support"
-	select USB_COMMON
-	help
-	  UTMI+ Low Pin Interface (ULPI) is specification for a commonly used
-	  USB 2.0 PHY interface. The ULPI specification defines a standard set
-	  of registers that can be used to detect the vendor and product which
-	  allows ULPI to be handled as a bus. This module is the driver for that
-	  bus.
-
-	  The ULPI interfaces (the buses) are registered by the drivers for USB
-	  controllers which support ULPI register access and have ULPI PHY
-	  attached to them. The ULPI PHY drivers themselves are normal PHY
-	  drivers.
-
-	  ULPI PHYs provide often functions such as ADP sensing/probing (OTG
-	  protocol) and USB charger detection.
-
-	  To compile this driver as a module, choose M here: the module will
-	  be called ulpi.
-
 endif # USB_SUPPORT
diff --git a/drivers/usb/common/Kconfig b/drivers/usb/common/Kconfig
new file mode 100644
index 000000000000..848545b099cf
--- /dev/null
+++ b/drivers/usb/common/Kconfig
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config USB_COMMON
+	tristate
+
+
+config USB_LED_TRIG
+	bool "USB LED Triggers"
+	depends on LEDS_CLASS && LEDS_TRIGGERS
+	select USB_COMMON
+	help
+	  This option adds LED triggers for USB host and/or gadget activity.
+
+	  Say Y here if you are working on a system with led-class supported
+	  LEDs and you want to use them as activity indicators for USB host or
+	  gadget.
+
+config USB_ULPI_BUS
+	tristate "USB ULPI PHY interface support"
+	select USB_COMMON
+	help
+	  UTMI+ Low Pin Interface (ULPI) is specification for a commonly used
+	  USB 2.0 PHY interface. The ULPI specification defines a standard set
+	  of registers that can be used to detect the vendor and product which
+	  allows ULPI to be handled as a bus. This module is the driver for that
+	  bus.
+
+	  The ULPI interfaces (the buses) are registered by the drivers for USB
+	  controllers which support ULPI register access and have ULPI PHY
+	  attached to them. The ULPI PHY drivers themselves are normal PHY
+	  drivers.
+
+	  ULPI PHYs provide often functions such as ADP sensing/probing (OTG
+	  protocol) and USB charger detection.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called ulpi.
+
-- 
2.23.0


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[PATCH next v10 10/11] usb: common: add USB GPIO based connection detection driver

[Chunfeng Yun]

Due to the requirement of usb-connector.txt binding, the old way
using extcon to support USB Dual-Role switch is now deprecated
when use Type-B connector.
This patch introduces a USB GPIO based connection detection driver,
used to support Type-B connector which typically uses an input GPIO
to detect USB ID pin, and try to replace the function provided
by the extcon-usb-gpio driver

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
---
v10 no changes

v9 changes:
  1. add reviewed-by Linus

v8 changes:
  1. rename the driver name and usb new compatible suggested by Heikki
  2. move the driver into usb/common from usb/roles suggested by Heikki

v7 changes:
  1. remove macro DEV_PMS_OPS suggested by Andy
  2. add tested-by Nagarjuna

v6 changes:
  1. get usb-role-swtich by usb_role_switch_get()

v5 changes:
  1. put usb_role_switch when error happens suggested by Biju
  2. don't treat bype-B connector as a virtual device suggested by Rob

v4 changes:
  1. remove linux/gpio.h suggested by Linus
  2. put node when error happens

v3 changes:
  1. treat bype-B connector as a virtual device;
  2. change file name again

v2 changes:
  1. file name is changed
  2. use new compatible
---
 drivers/usb/common/Kconfig         |  13 ++
 drivers/usb/common/Makefile        |   1 +
 drivers/usb/common/usb-conn-gpio.c | 284 +++++++++++++++++++++++++++++
 3 files changed, 298 insertions(+)
 create mode 100644 drivers/usb/common/usb-conn-gpio.c

diff --git a/drivers/usb/common/Kconfig b/drivers/usb/common/Kconfig
index 848545b099cf..d611477aae41 100644
--- a/drivers/usb/common/Kconfig
+++ b/drivers/usb/common/Kconfig
@@ -36,3 +36,16 @@ config USB_ULPI_BUS
 	  To compile this driver as a module, choose M here: the module will
 	  be called ulpi.
 
+config USB_CONN_GPIO
+	tristate "USB GPIO Based Connection Detection Driver"
+	depends on GPIOLIB
+	select USB_ROLE_SWITCH
+	help
+	  The driver supports USB role switch between host and device via GPIO
+	  based USB cable detection, used typically if an input GPIO is used
+	  to detect USB ID pin, and another input GPIO may be also used to detect
+	  Vbus pin at the same time, it also can be used to enable/disable
+	  device if an input GPIO is only used to detect Vbus pin.
+
+	  To compile the driver as a module, choose M here: the module will
+	  be called usb-conn-gpio.ko
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
index 0a7c45e85481..8227ffc2cf0b 100644
--- a/drivers/usb/common/Makefile
+++ b/drivers/usb/common/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_USB_COMMON)	  += usb-common.o
 usb-common-y			  += common.o
 usb-common-$(CONFIG_USB_LED_TRIG) += led.o
 
+obj-$(CONFIG_USB_CONN_GPIO)	+= usb-conn-gpio.o
 obj-$(CONFIG_USB_OTG_FSM) += usb-otg-fsm.o
 obj-$(CONFIG_USB_ULPI_BUS)	+= ulpi.o
diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
new file mode 100644
index 000000000000..e4935e99f295
--- /dev/null
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB GPIO Based Connection Detection Driver
+ *
+ * Copyright (C) 2019 MediaTek Inc.
+ *
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ *
+ * Some code borrowed from drivers/extcon/extcon-usb-gpio.c
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/role.h>
+
+#define USB_GPIO_DEB_MS		20	/* ms */
+#define USB_GPIO_DEB_US		((USB_GPIO_DEB_MS) * 1000)	/* us */
+
+#define USB_CONN_IRQF	\
+	(IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT)
+
+struct usb_conn_info {
+	struct device *dev;
+	struct usb_role_switch *role_sw;
+	enum usb_role last_role;
+	struct regulator *vbus;
+	struct delayed_work dw_det;
+	unsigned long debounce_jiffies;
+
+	struct gpio_desc *id_gpiod;
+	struct gpio_desc *vbus_gpiod;
+	int id_irq;
+	int vbus_irq;
+};
+
+/**
+ * "DEVICE" = VBUS and "HOST" = !ID, so we have:
+ * Both "DEVICE" and "HOST" can't be set as active at the same time
+ * so if "HOST" is active (i.e. ID is 0)  we keep "DEVICE" inactive
+ * even if VBUS is on.
+ *
+ *  Role          |   ID  |  VBUS
+ * ------------------------------------
+ *  [1] DEVICE    |   H   |   H
+ *  [2] NONE      |   H   |   L
+ *  [3] HOST      |   L   |   H
+ *  [4] HOST      |   L   |   L
+ *
+ * In case we have only one of these signals:
+ * - VBUS only - we want to distinguish between [1] and [2], so ID is always 1
+ * - ID only - we want to distinguish between [1] and [4], so VBUS = ID
+ */
+static void usb_conn_detect_cable(struct work_struct *work)
+{
+	struct usb_conn_info *info;
+	enum usb_role role;
+	int id, vbus, ret;
+
+	info = container_of(to_delayed_work(work),
+			    struct usb_conn_info, dw_det);
+
+	/* check ID and VBUS */
+	id = info->id_gpiod ?
+		gpiod_get_value_cansleep(info->id_gpiod) : 1;
+	vbus = info->vbus_gpiod ?
+		gpiod_get_value_cansleep(info->vbus_gpiod) : id;
+
+	if (!id)
+		role = USB_ROLE_HOST;
+	else if (vbus)
+		role = USB_ROLE_DEVICE;
+	else
+		role = USB_ROLE_NONE;
+
+	dev_dbg(info->dev, "role %d/%d, gpios: id %d, vbus %d\n",
+		info->last_role, role, id, vbus);
+
+	if (info->last_role == role) {
+		dev_warn(info->dev, "repeated role: %d\n", role);
+		return;
+	}
+
+	if (info->last_role == USB_ROLE_HOST)
+		regulator_disable(info->vbus);
+
+	ret = usb_role_switch_set_role(info->role_sw, role);
+	if (ret)
+		dev_err(info->dev, "failed to set role: %d\n", ret);
+
+	if (role == USB_ROLE_HOST) {
+		ret = regulator_enable(info->vbus);
+		if (ret)
+			dev_err(info->dev, "enable vbus regulator failed\n");
+	}
+
+	info->last_role = role;
+
+	dev_dbg(info->dev, "vbus regulator is %s\n",
+		regulator_is_enabled(info->vbus) ? "enabled" : "disabled");
+}
+
+static void usb_conn_queue_dwork(struct usb_conn_info *info,
+				 unsigned long delay)
+{
+	queue_delayed_work(system_power_efficient_wq, &info->dw_det, delay);
+}
+
+static irqreturn_t usb_conn_isr(int irq, void *dev_id)
+{
+	struct usb_conn_info *info = dev_id;
+
+	usb_conn_queue_dwork(info, info->debounce_jiffies);
+
+	return IRQ_HANDLED;
+}
+
+static int usb_conn_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct usb_conn_info *info;
+	int ret = 0;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = dev;
+	info->id_gpiod = devm_gpiod_get_optional(dev, "id", GPIOD_IN);
+	if (IS_ERR(info->id_gpiod))
+		return PTR_ERR(info->id_gpiod);
+
+	info->vbus_gpiod = devm_gpiod_get_optional(dev, "vbus", GPIOD_IN);
+	if (IS_ERR(info->vbus_gpiod))
+		return PTR_ERR(info->vbus_gpiod);
+
+	if (!info->id_gpiod && !info->vbus_gpiod) {
+		dev_err(dev, "failed to get gpios\n");
+		return -ENODEV;
+	}
+
+	if (info->id_gpiod)
+		ret = gpiod_set_debounce(info->id_gpiod, USB_GPIO_DEB_US);
+	if (!ret && info->vbus_gpiod)
+		ret = gpiod_set_debounce(info->vbus_gpiod, USB_GPIO_DEB_US);
+	if (ret < 0)
+		info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEB_MS);
+
+	INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable);
+
+	info->vbus = devm_regulator_get(dev, "vbus");
+	if (IS_ERR(info->vbus)) {
+		dev_err(dev, "failed to get vbus\n");
+		return PTR_ERR(info->vbus);
+	}
+
+	info->role_sw = usb_role_switch_get(dev);
+	if (IS_ERR(info->role_sw)) {
+		if (PTR_ERR(info->role_sw) != -EPROBE_DEFER)
+			dev_err(dev, "failed to get role switch\n");
+
+		return PTR_ERR(info->role_sw);
+	}
+
+	if (info->id_gpiod) {
+		info->id_irq = gpiod_to_irq(info->id_gpiod);
+		if (info->id_irq < 0) {
+			dev_err(dev, "failed to get ID IRQ\n");
+			ret = info->id_irq;
+			goto put_role_sw;
+		}
+
+		ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
+						usb_conn_isr, USB_CONN_IRQF,
+						pdev->name, info);
+		if (ret < 0) {
+			dev_err(dev, "failed to request ID IRQ\n");
+			goto put_role_sw;
+		}
+	}
+
+	if (info->vbus_gpiod) {
+		info->vbus_irq = gpiod_to_irq(info->vbus_gpiod);
+		if (info->vbus_irq < 0) {
+			dev_err(dev, "failed to get VBUS IRQ\n");
+			ret = info->vbus_irq;
+			goto put_role_sw;
+		}
+
+		ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
+						usb_conn_isr, USB_CONN_IRQF,
+						pdev->name, info);
+		if (ret < 0) {
+			dev_err(dev, "failed to request VBUS IRQ\n");
+			goto put_role_sw;
+		}
+	}
+
+	platform_set_drvdata(pdev, info);
+
+	/* Perform initial detection */
+	usb_conn_queue_dwork(info, 0);
+
+	return 0;
+
+put_role_sw:
+	usb_role_switch_put(info->role_sw);
+	return ret;
+}
+
+static int usb_conn_remove(struct platform_device *pdev)
+{
+	struct usb_conn_info *info = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&info->dw_det);
+
+	if (info->last_role == USB_ROLE_HOST)
+		regulator_disable(info->vbus);
+
+	usb_role_switch_put(info->role_sw);
+
+	return 0;
+}
+
+static int __maybe_unused usb_conn_suspend(struct device *dev)
+{
+	struct usb_conn_info *info = dev_get_drvdata(dev);
+
+	if (info->id_gpiod)
+		disable_irq(info->id_irq);
+	if (info->vbus_gpiod)
+		disable_irq(info->vbus_irq);
+
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int __maybe_unused usb_conn_resume(struct device *dev)
+{
+	struct usb_conn_info *info = dev_get_drvdata(dev);
+
+	pinctrl_pm_select_default_state(dev);
+
+	if (info->id_gpiod)
+		enable_irq(info->id_irq);
+	if (info->vbus_gpiod)
+		enable_irq(info->vbus_irq);
+
+	usb_conn_queue_dwork(info, 0);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(usb_conn_pm_ops,
+			 usb_conn_suspend, usb_conn_resume);
+
+static const struct of_device_id usb_conn_dt_match[] = {
+	{ .compatible = "linux,usb-conn-gpio", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, usb_conn_dt_match);
+
+static struct platform_driver usb_conn_driver = {
+	.probe		= usb_conn_probe,
+	.remove		= usb_conn_remove,
+	.driver		= {
+		.name	= "usb-conn-gpio",
+		.pm	= &usb_conn_pm_ops,
+		.of_match_table = usb_conn_dt_match,
+	},
+};
+
+module_platform_driver(usb_conn_driver);
+
+MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
+MODULE_DESCRIPTION("USB GPIO based connection detection driver");
+MODULE_LICENSE("GPL v2");
-- 
2.23.0


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[PATCH next v10 11/11] usb: mtu3: register a USB Role Switch for dual role mode

[Chunfeng Yun]

Because extcon is not allowed for new bindings, and the
dual role switch is supported by USB Role Switch,
especially for Type-C drivers, so register a USB Role
Switch to support the new way

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v5~v10 no changes

v4 changes:
  1. assign fwnode member of usb_role_switch struct suggested by Heikki

v3 changes:
  1. select USB_ROLE_SWITCH in Kconfig suggested by Heikki
  2. rename ssusb_mode_manual_switch() to ssusb_mode_switch()

v2 no changes
---
 drivers/usb/mtu3/Kconfig        |  1 +
 drivers/usb/mtu3/mtu3.h         |  5 ++++
 drivers/usb/mtu3/mtu3_debugfs.c |  4 +--
 drivers/usb/mtu3/mtu3_dr.c      | 48 ++++++++++++++++++++++++++++++++-
 drivers/usb/mtu3/mtu3_dr.h      |  6 ++---
 drivers/usb/mtu3/mtu3_plat.c    |  3 ++-
 6 files changed, 60 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/mtu3/Kconfig b/drivers/usb/mtu3/Kconfig
index 928c2cd6fc00..bf98fd36341d 100644
--- a/drivers/usb/mtu3/Kconfig
+++ b/drivers/usb/mtu3/Kconfig
@@ -44,6 +44,7 @@ config USB_MTU3_DUAL_ROLE
 	bool "Dual Role mode"
 	depends on ((USB=y || USB=USB_MTU3) && (USB_GADGET=y || USB_GADGET=USB_MTU3))
 	depends on (EXTCON=y || EXTCON=USB_MTU3)
+	select USB_ROLE_SWITCH
 	help
 	  This is the default mode of working of MTU3 controller where
 	  both host and gadget features are enabled.
diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h
index 76ecf12fdf62..6087be236a35 100644
--- a/drivers/usb/mtu3/mtu3.h
+++ b/drivers/usb/mtu3/mtu3.h
@@ -199,6 +199,9 @@ struct mtu3_gpd_ring {
 * @id_nb : notifier for iddig(idpin) detection
 * @id_work : work of iddig detection notifier
 * @id_event : event of iddig detecion notifier
+* @role_sw : use USB Role Switch to support dual-role switch, can't use
+*		extcon at the same time, and extcon is deprecated.
+* @role_sw_used : true when the USB Role Switch is used.
 * @is_u3_drd: whether port0 supports usb3.0 dual-role device or not
 * @manual_drd_enabled: it's true when supports dual-role device by debugfs
 *		to switch host/device modes depending on user input.
@@ -212,6 +215,8 @@ struct otg_switch_mtk {
 	struct notifier_block id_nb;
 	struct work_struct id_work;
 	unsigned long id_event;
+	struct usb_role_switch *role_sw;
+	bool role_sw_used;
 	bool is_u3_drd;
 	bool manual_drd_enabled;
 };
diff --git a/drivers/usb/mtu3/mtu3_debugfs.c b/drivers/usb/mtu3/mtu3_debugfs.c
index 62c57ddc554e..c96e5dab0a48 100644
--- a/drivers/usb/mtu3/mtu3_debugfs.c
+++ b/drivers/usb/mtu3/mtu3_debugfs.c
@@ -453,9 +453,9 @@ static ssize_t ssusb_mode_write(struct file *file, const char __user *ubuf,
 		return -EFAULT;
 
 	if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
-		ssusb_mode_manual_switch(ssusb, 1);
+		ssusb_mode_switch(ssusb, 1);
 	} else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
-		ssusb_mode_manual_switch(ssusb, 0);
+		ssusb_mode_switch(ssusb, 0);
 	} else {
 		dev_err(ssusb->dev, "wrong or duplicated setting\n");
 		return -EINVAL;
diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c
index 5fcb71af875a..08e18448e8b8 100644
--- a/drivers/usb/mtu3/mtu3_dr.c
+++ b/drivers/usb/mtu3/mtu3_dr.c
@@ -7,6 +7,8 @@
  * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
  */
 
+#include <linux/usb/role.h>
+
 #include "mtu3.h"
 #include "mtu3_dr.h"
 #include "mtu3_debug.h"
@@ -280,7 +282,7 @@ static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
  * This is useful in special cases, such as uses TYPE-A receptacle but also
  * wants to support dual-role mode.
  */
-void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
+void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host)
 {
 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
 
@@ -318,6 +320,47 @@ void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
 	mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
 }
 
+static int ssusb_role_sw_set(struct device *dev, enum usb_role role)
+{
+	struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
+	bool to_host = false;
+
+	if (role == USB_ROLE_HOST)
+		to_host = true;
+
+	if (to_host ^ ssusb->is_host)
+		ssusb_mode_switch(ssusb, to_host);
+
+	return 0;
+}
+
+static enum usb_role ssusb_role_sw_get(struct device *dev)
+{
+	struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
+	enum usb_role role;
+
+	role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
+
+	return role;
+}
+
+static int ssusb_role_sw_register(struct otg_switch_mtk *otg_sx)
+{
+	struct usb_role_switch_desc role_sx_desc = { 0 };
+	struct ssusb_mtk *ssusb =
+		container_of(otg_sx, struct ssusb_mtk, otg_switch);
+
+	if (!otg_sx->role_sw_used)
+		return 0;
+
+	role_sx_desc.set = ssusb_role_sw_set;
+	role_sx_desc.get = ssusb_role_sw_get;
+	role_sx_desc.fwnode = dev_fwnode(ssusb->dev);
+	otg_sx->role_sw = usb_role_switch_register(ssusb->dev, &role_sx_desc);
+
+	return PTR_ERR_OR_ZERO(otg_sx->role_sw);
+}
+
 int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
 {
 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
@@ -328,6 +371,8 @@ int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
 
 	if (otg_sx->manual_drd_enabled)
 		ssusb_dr_debugfs_init(ssusb);
+	else if (otg_sx->role_sw_used)
+		ret = ssusb_role_sw_register(otg_sx);
 	else
 		ret = ssusb_extcon_register(otg_sx);
 
@@ -340,4 +385,5 @@ void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
 
 	cancel_work_sync(&otg_sx->id_work);
 	cancel_work_sync(&otg_sx->vbus_work);
+	usb_role_switch_unregister(otg_sx->role_sw);
 }
diff --git a/drivers/usb/mtu3/mtu3_dr.h b/drivers/usb/mtu3/mtu3_dr.h
index ba6fe357ce29..5e58c4dbd54a 100644
--- a/drivers/usb/mtu3/mtu3_dr.h
+++ b/drivers/usb/mtu3/mtu3_dr.h
@@ -71,7 +71,7 @@ static inline void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
 #if IS_ENABLED(CONFIG_USB_MTU3_DUAL_ROLE)
 int ssusb_otg_switch_init(struct ssusb_mtk *ssusb);
 void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb);
-void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host);
+void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host);
 int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on);
 void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
 			  enum mtu3_dr_force_mode mode);
@@ -86,8 +86,8 @@ static inline int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
 static inline void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
 {}
 
-static inline void
-ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host) {}
+static inline void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host)
+{}
 
 static inline int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
 {
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index fd0f6c5dfbc1..9c256ea3cdf5 100644
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -299,8 +299,9 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
 	otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
 	otg_sx->manual_drd_enabled =
 		of_property_read_bool(node, "enable-manual-drd");
+	otg_sx->role_sw_used = of_property_read_bool(node, "usb-role-switch");
 
-	if (of_property_read_bool(node, "extcon")) {
+	if (!otg_sx->role_sw_used && of_property_read_bool(node, "extcon")) {
 		otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
 		if (IS_ERR(otg_sx->edev)) {
 			dev_err(ssusb->dev, "couldn't get extcon device\n");
-- 
2.23.0


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Re: [PATCH next v10 03/11] dt-bindings: usb: add binding for USB GPIO based connection detection driver

[Linus Walleij]

On Fri, Aug 23, 2019 at 9:58 AM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:

> It's used to support dual role switch via GPIO when use Type-B
> receptacle, typically the USB ID pin is connected to an input
> GPIO, and also used to enable/disable device when the USB Vbus
> pin is connected to an input GPIO.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v9~v10 no changes

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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Re: [PATCH next v10 03/11] dt-bindings: usb: add binding for USB GPIO based connection detection driver

[Rob Herring]

On Fri, Aug 23, 2019 at 03:57:13PM +0800, Chunfeng Yun wrote:
> It's used to support dual role switch via GPIO when use Type-B
> receptacle, typically the USB ID pin is connected to an input
> GPIO, and also used to enable/disable device when the USB Vbus
> pin is connected to an input GPIO.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v9~v10 no changes
> 
> v8 changes:
>  1. rename the title
>  2. change the compatible as "linux,usb-conn-gpio" instead of
>     "linux,typeb-conn-gpio"

I don't think that is an improvement. How about 'gpio-usb-b-connector' 
to be consistent.

> 
> v7 changes:
>  1. add description for device only mode
> 
> v6 changes:
>  1. remove status and port nodes in example
>  2. make vbus-supply as optional property
> 
> v5 changes:
>  1. treat type-B connector as child device of USB controller's, but not
>     as a separate virtual device, suggested by Rob
>  2. put connector's port node under connector node, suggested by Rob
> 
> v4 no changes
> 
> v3 changes:
>  1. treat type-B connector as a virtual device, but not child device of
>     USB controller's
> 
> v2 changes:
>   1. new patch to make binding clear suggested by Hans
> ---
>  .../devicetree/bindings/usb/usb-conn-gpio.txt | 31 +++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> new file mode 100644
> index 000000000000..d4d107fedc22
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> @@ -0,0 +1,31 @@
> +USB GPIO Based Connection Detection
> +
> +This is typically used to switch dual role mode from the USB ID pin connected
> +to an input GPIO, and also used to enable/disable device mode from the USB
> +Vbus pin connected to an input GPIO.
> +
> +Required properties:
> +- compatible : should include "linux,usb-conn-gpio" and "usb-b-connector".
> +- id-gpios, vbus-gpios : input gpios, either one of them must be present,
> +	and both can be present as well.
> +	see connector/usb-connector.txt
> +
> +Optional properties:
> +- vbus-supply : can be present if needed when supports dual role mode.
> +	see connector/usb-connector.txt
> +
> +- Sub-nodes:
> +	- port : can be present.
> +		see graph.txt
> +
> +Example:
> +
> +&mtu3 {
> +	connector {
> +		compatible = "linux,usb-conn-gpio", "usb-b-connector";
> +		label = "micro-USB";

'label' is for a human identifying a particular connector when there are 
multiple (of the same type). So not a great example here.

> +		type = "micro";
> +		id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
> +		vbus-supply = <&usb_p0_vbus>;
> +	};
> +};
> -- 
> 2.23.0
> 

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Re: [PATCH next v10 03/11] dt-bindings: usb: add binding for USB GPIO based connection detection driver

[Chunfeng Yun]

On Tue, 2019-08-27 at 13:31 -0500, Rob Herring wrote:
> On Fri, Aug 23, 2019 at 03:57:13PM +0800, Chunfeng Yun wrote:
> > It's used to support dual role switch via GPIO when use Type-B
> > receptacle, typically the USB ID pin is connected to an input
> > GPIO, and also used to enable/disable device when the USB Vbus
> > pin is connected to an input GPIO.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> > ---
> > v9~v10 no changes
> > 
> > v8 changes:
> >  1. rename the title
> >  2. change the compatible as "linux,usb-conn-gpio" instead of
> >     "linux,typeb-conn-gpio"
> 
> I don't think that is an improvement. How about 'gpio-usb-b-connector' 
> to be consistent.
Ok

> 
> > 
> > v7 changes:
> >  1. add description for device only mode
> > 
> > v6 changes:
> >  1. remove status and port nodes in example
> >  2. make vbus-supply as optional property
> > 
> > v5 changes:
> >  1. treat type-B connector as child device of USB controller's, but not
> >     as a separate virtual device, suggested by Rob
> >  2. put connector's port node under connector node, suggested by Rob
> > 
> > v4 no changes
> > 
> > v3 changes:
> >  1. treat type-B connector as a virtual device, but not child device of
> >     USB controller's
> > 
> > v2 changes:
> >   1. new patch to make binding clear suggested by Hans
> > ---
> >  .../devicetree/bindings/usb/usb-conn-gpio.txt | 31 +++++++++++++++++++
> >  1 file changed, 31 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> > new file mode 100644
> > index 000000000000..d4d107fedc22
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> > @@ -0,0 +1,31 @@
> > +USB GPIO Based Connection Detection
> > +
> > +This is typically used to switch dual role mode from the USB ID pin connected
> > +to an input GPIO, and also used to enable/disable device mode from the USB
> > +Vbus pin connected to an input GPIO.
> > +
> > +Required properties:
> > +- compatible : should include "linux,usb-conn-gpio" and "usb-b-connector".
> > +- id-gpios, vbus-gpios : input gpios, either one of them must be present,
> > +	and both can be present as well.
> > +	see connector/usb-connector.txt
> > +
> > +Optional properties:
> > +- vbus-supply : can be present if needed when supports dual role mode.
> > +	see connector/usb-connector.txt
> > +
> > +- Sub-nodes:
> > +	- port : can be present.
> > +		see graph.txt
> > +
> > +Example:
> > +
> > +&mtu3 {
> > +	connector {
> > +		compatible = "linux,usb-conn-gpio", "usb-b-connector";
> > +		label = "micro-USB";
> 
> 'label' is for a human identifying a particular connector when there are 
> multiple (of the same type). So not a great example here.
Got it, will remove it

Thanks a lot
> 
> > +		type = "micro";
> > +		id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
> > +		vbus-supply = <&usb_p0_vbus>;
> > +	};
> > +};
> > -- 
> > 2.23.0
> > 



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