[PATCH v6 0/8] HiKey960 USB support

[PATCH v6 0/8] HiKey960 USB support

[John Stultz]

Just another round here trying to push forward a patch series
submitted originally by Yu Chen to get HiKey960 dev-board's USB
functionality working.

The full patchset (including dts changes not submitted here) can
be found here:
https://git.linaro.org/people/john.stultz/android-dev.git/log/?id=950276ae1baab3a22836d1f89aeadbb08adf41e0


NOTE: I unfortunately don't have any deep knowledge of the
hardware other then the previously submitted code  and what I
can intuit from testing. I tried to document the previously
undocumented bindings, fixed up a few minor checkpatch issues
and tried to address previous feedback as best I could.

I'd greatly appreciate any feedback or thoughts!

thanks
-john

New in v6:
* Felipe previously had disliked extending the dwc3 binding
  to allow for more flexible clock and resest lists, so in
  the last series I switched back to the dwc3-simple-of.c 
  approach, but Rob pushed back on the last series, and with
  no reply from Felipe, I've switched back to this appraoch.
  Clear guidance would be appreciated here!
* Fixed build issue Reported-by: kbuild test robot <lkp@intel.com>


Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org

John Stultz (5):
  dt-bindings: usb: generic: Add role-switch-default-mode binding
  usb: dwc3: Add support for role-switch-default-mode binding
  dt-bindings: usb: dwc3: Allow clock list & resets to be more flexible
  usb: dwc3: Rework clock initialization to be more flexible
  usb: dwc3: Rework resets initialization to be more flexible

Yu Chen (3):
  usb: dwc3: Registering a role switch in the DRD code.
  dt-bindings: misc: Add bindings for HiSilicon usb hub and data role
    switch functionality on HiKey960
  misc: hisi_hikey_usb: Driver to support usb functionality of Hikey960

 .../bindings/misc/hisilicon-hikey-usb.txt     |  40 ++++
 .../devicetree/bindings/usb/dwc3.txt          |   5 +-
 .../devicetree/bindings/usb/generic.txt       |   6 +
 drivers/misc/Kconfig                          |   6 +
 drivers/misc/Makefile                         |   1 +
 drivers/misc/hisi_hikey_usb.c                 | 178 ++++++++++++++++++
 drivers/usb/dwc3/core.c                       |  22 +--
 drivers/usb/dwc3/core.h                       |   6 +
 drivers/usb/dwc3/drd.c                        |  96 +++++++++-
 9 files changed, 341 insertions(+), 19 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
 create mode 100644 drivers/misc/hisi_hikey_usb.c

-- 
2.17.1

[PATCH v6 1/8] usb: dwc3: Registering a role switch in the DRD code.

[John Stultz]

From: Yu Chen <chenyu56@huawei.com>

The Type-C drivers use USB role switch API to inform the
system about the negotiated data role, so registering a role
switch in the DRD code in order to support platforms with
USB Type-C connectors.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Ibd89b7eb3e59688895a2d317f3515e6d2705c6f3
---
v2: Fix role_sw and role_switch_default_mode descriptions as
    reported by kbuild test robot <lkp@intel.com>

v3: Split out the role-switch-default-host logic into its own
    patch

v5: Drop selecting CONFIG_USB_ROLE_SWITCH & ifdef dependent code

v6: Fix build issue Reported-by: kbuild test robot <lkp@intel.com>
---
 drivers/usb/dwc3/core.h |  3 ++
 drivers/usb/dwc3/drd.c  | 77 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 1c8b349379af..6f19e9891767 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -25,6 +25,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/otg.h>
+#include <linux/usb/role.h>
 #include <linux/ulpi/interface.h>
 
 #include <linux/phy/phy.h>
@@ -951,6 +952,7 @@ struct dwc3_scratchpad_array {
  * @hsphy_mode: UTMI phy mode, one of following:
  *		- USBPHY_INTERFACE_MODE_UTMI
  *		- USBPHY_INTERFACE_MODE_UTMIW
+ * @role_sw: usb_role_switch handle
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @usb2_generic_phy: pointer to USB2 PHY
@@ -1084,6 +1086,7 @@ struct dwc3 {
 	struct extcon_dev	*edev;
 	struct notifier_block	edev_nb;
 	enum usb_phy_interface	hsphy_mode;
+	struct usb_role_switch	*role_sw;
 
 	u32			fladj;
 	u32			irq_gadget;
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index c946d64142ad..3b57d2ddda93 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -476,6 +476,73 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
 	return edev;
 }
 
+#ifdef CONFIG_USB_ROLE_SWITCH
+#define ROLE_SWITCH 1
+static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
+{
+	struct dwc3 *dwc = dev_get_drvdata(dev);
+	u32 mode;
+
+	switch (role) {
+	case USB_ROLE_HOST:
+		mode = DWC3_GCTL_PRTCAP_HOST;
+		break;
+	case USB_ROLE_DEVICE:
+		mode = DWC3_GCTL_PRTCAP_DEVICE;
+		break;
+	default:
+		mode = DWC3_GCTL_PRTCAP_DEVICE;
+		break;
+	}
+
+	dwc3_set_mode(dwc, mode);
+	return 0;
+}
+
+static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
+{
+	struct dwc3 *dwc = dev_get_drvdata(dev);
+	unsigned long flags;
+	enum usb_role role;
+
+	spin_lock_irqsave(&dwc->lock, flags);
+	switch (dwc->current_dr_role) {
+	case DWC3_GCTL_PRTCAP_HOST:
+		role = USB_ROLE_HOST;
+		break;
+	case DWC3_GCTL_PRTCAP_DEVICE:
+		role = USB_ROLE_DEVICE;
+		break;
+	case DWC3_GCTL_PRTCAP_OTG:
+		role = dwc->current_otg_role;
+		break;
+	default:
+		role = USB_ROLE_DEVICE;
+		break;
+	}
+	spin_unlock_irqrestore(&dwc->lock, flags);
+	return role;
+}
+
+static int dwc3_setup_role_switch(struct dwc3 *dwc)
+{
+	struct usb_role_switch_desc dwc3_role_switch = {NULL};
+
+	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
+	dwc3_role_switch.set = dwc3_usb_role_switch_set;
+	dwc3_role_switch.get = dwc3_usb_role_switch_get;
+	dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
+	if (IS_ERR(dwc->role_sw))
+		return PTR_ERR(dwc->role_sw);
+
+	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
+	return 0;
+}
+#else
+#define ROLE_SWITCH 0
+#define dwc3_setup_role_switch(x) 0
+#endif
+
 int dwc3_drd_init(struct dwc3 *dwc)
 {
 	int ret, irq;
@@ -484,7 +551,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
 	if (IS_ERR(dwc->edev))
 		return PTR_ERR(dwc->edev);
 
-	if (dwc->edev) {
+	if (ROLE_SWITCH &&
+	    device_property_read_bool(dwc->dev, "usb-role-switch")) {
+		ret = dwc3_setup_role_switch(dwc);
+		if (ret < 0)
+			return ret;
+	} else if (dwc->edev) {
 		dwc->edev_nb.notifier_call = dwc3_drd_notifier;
 		ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
 					       &dwc->edev_nb);
@@ -531,6 +603,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
 {
 	unsigned long flags;
 
+	if (dwc->role_sw)
+		usb_role_switch_unregister(dwc->role_sw);
+
 	if (dwc->edev)
 		extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
 					   &dwc->edev_nb);
-- 
2.17.1

[PATCH v6 2/8] dt-bindings: usb: generic: Add role-switch-default-mode binding

[John Stultz]

Add binding to configure the default role the controller
assumes is host mode when the usb role is USB_ROLE_NONE.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I6ac1d9c56039d76d924148e29a5e4b0bb304ed0f
---
v5: Switch to string rather then a bool
---
 Documentation/devicetree/bindings/usb/generic.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index cf5a1ad456e6..dd733fa81fad 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -34,6 +34,12 @@ Optional properties:
 			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.
+ - role-switch-default-mode: indicating if usb-role-switch is enabled, the
+			device default operation mode of controller while usb
+			role is USB_ROLE_NONE. Valid arguments are "host" and
+			"peripheral". Defaults to "peripheral" if not
+			specified.
+
 
 This is an attribute to a USB controller such as:
 
-- 
2.17.1

[PATCH v6 3/8] usb: dwc3: Add support for role-switch-default-mode binding

[John Stultz]

Support the new role-switch-default-mode binding for configuring
the default role the controller assumes as when the usb role is
USB_ROLE_NONE

This patch was split out from a larger patch originally by
Yu Chen <chenyu56@huawei.com>

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Ic6e4df1109b350deaecdc69f667d49ce91d599f3
---
v3: Split this patch out from addition of usb-role-switch
    handling
v5: Reworked to use string based role-switch-default-mode
---
 drivers/usb/dwc3/core.h |  3 +++
 drivers/usb/dwc3/drd.c  | 25 ++++++++++++++++++++++---
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 6f19e9891767..3c879c9ab1aa 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -953,6 +953,8 @@ struct dwc3_scratchpad_array {
  *		- USBPHY_INTERFACE_MODE_UTMI
  *		- USBPHY_INTERFACE_MODE_UTMIW
  * @role_sw: usb_role_switch handle
+ * @role_switch_default_mode: default operation mode of controller while
+ *			usb role is USB_ROLE_NONE.
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @usb2_generic_phy: pointer to USB2 PHY
@@ -1087,6 +1089,7 @@ struct dwc3 {
 	struct notifier_block	edev_nb;
 	enum usb_phy_interface	hsphy_mode;
 	struct usb_role_switch	*role_sw;
+	enum usb_dr_mode	role_switch_default_mode;
 
 	u32			fladj;
 	u32			irq_gadget;
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index 3b57d2ddda93..865341facece 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -491,7 +491,10 @@ static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
 		mode = DWC3_GCTL_PRTCAP_DEVICE;
 		break;
 	default:
-		mode = DWC3_GCTL_PRTCAP_DEVICE;
+		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
+			mode = DWC3_GCTL_PRTCAP_HOST;
+		else
+			mode = DWC3_GCTL_PRTCAP_DEVICE;
 		break;
 	}
 
@@ -517,7 +520,10 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
 		role = dwc->current_otg_role;
 		break;
 	default:
-		role = USB_ROLE_DEVICE;
+		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
+			role = USB_ROLE_HOST;
+		else
+			role = USB_ROLE_DEVICE;
 		break;
 	}
 	spin_unlock_irqrestore(&dwc->lock, flags);
@@ -527,6 +533,19 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
 static int dwc3_setup_role_switch(struct dwc3 *dwc)
 {
 	struct usb_role_switch_desc dwc3_role_switch = {NULL};
+	const char *str;
+	u32 mode;
+	int ret;
+
+	ret = device_property_read_string(dwc->dev, "role-switch-default-mode",
+					  &str);
+	if (ret >= 0  && !strncmp(str, "host", strlen("host"))) {
+		dwc->role_switch_default_mode = USB_DR_MODE_HOST;
+		mode = DWC3_GCTL_PRTCAP_HOST;
+	} else {
+		dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
+		mode = DWC3_GCTL_PRTCAP_DEVICE;
+	}
 
 	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
 	dwc3_role_switch.set = dwc3_usb_role_switch_set;
@@ -535,7 +554,7 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
 	if (IS_ERR(dwc->role_sw))
 		return PTR_ERR(dwc->role_sw);
 
-	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
+	dwc3_set_mode(dwc, mode);
 	return 0;
 }
 #else
-- 
2.17.1

[PATCH v6 4/8] dt-bindings: usb: dwc3: Allow clock list & resets to be more flexible

[John Stultz]

Rather then adding another device specific binding to support
hikey960, Rob Herring suggested we expand the current dwc3
binding to allow for variable numbers of clocks and resets.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Suggested-by: Rob Herring <robh@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I0176989314d7b7e6ea586f5036f072442f7e34e1
---
 Documentation/devicetree/bindings/usb/dwc3.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 66780a47ad85..29768b0ca923 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -7,7 +7,8 @@ Required properties:
  - compatible: must be "snps,dwc3"
  - reg : Address and length of the register set for the device
  - interrupts: Interrupts used by the dwc3 controller.
- - clock-names: should contain "ref", "bus_early", "suspend"
+ - clock-names: list of clock names. Ideally should be "ref",
+                "bus_early", "suspend" but may be less or more.
  - clocks: list of phandle and clock specifier pairs corresponding to
            entries in the clock-names property.
 
@@ -36,7 +37,7 @@ Optional properties:
  - phys: from the *Generic PHY* bindings
  - phy-names: from the *Generic PHY* bindings; supported names are "usb2-phy"
 	or "usb3-phy".
- - resets: a single pair of phandle and reset specifier
+ - resets: set of phandle and reset specifier pairs
  - snps,usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
  - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
  - snps,dis-start-transfer-quirk: when set, disable isoc START TRANSFER command
-- 
2.17.1

[PATCH v6 5/8] usb: dwc3: Rework clock initialization to be more flexible

[John Stultz]

The dwc3 core binding specifies three clocks:
  ref, bus_early, and suspend

which are all controlled in the driver together.

However some variants of the hardware my not have all three
clks, or some may have more. Usually this was handled by using
the dwc3-of-simple glue driver, but that resulted in a
proliferation of bindings for for every variant, when the only
difference was the clocks and resets lists.

So this patch reworks the reading of the clks from the dts to
use devm_clk_bulk_get_all() will will fetch all the clocks
specified in the dts together.

This patch was recommended by Rob Herring <robh@kernel.org>
as an alternative to creating multiple bindings for each variant
of hardware.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I3319bec8253edc131d772ca66dc9335435b06424
---
v3: Rework dwc3 core rather then adding another dwc-of-simple
    binding.
v6: Re-introduce this patch, on Rob's suggestion
---
 drivers/usb/dwc3/core.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f561c6c9e8a9..c6316d4b7593 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -289,12 +289,6 @@ static int dwc3_core_soft_reset(struct dwc3 *dwc)
 	return 0;
 }
 
-static const struct clk_bulk_data dwc3_core_clks[] = {
-	{ .id = "ref" },
-	{ .id = "bus_early" },
-	{ .id = "suspend" },
-};
-
 /*
  * dwc3_frame_length_adjustment - Adjusts frame length if required
  * @dwc3: Pointer to our controller context structure
@@ -1438,11 +1432,6 @@ static int dwc3_probe(struct platform_device *pdev)
 	if (!dwc)
 		return -ENOMEM;
 
-	dwc->clks = devm_kmemdup(dev, dwc3_core_clks, sizeof(dwc3_core_clks),
-				 GFP_KERNEL);
-	if (!dwc->clks)
-		return -ENOMEM;
-
 	dwc->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1478,17 +1467,18 @@ static int dwc3_probe(struct platform_device *pdev)
 		return PTR_ERR(dwc->reset);
 
 	if (dev->of_node) {
-		dwc->num_clks = ARRAY_SIZE(dwc3_core_clks);
-
-		ret = devm_clk_bulk_get(dev, dwc->num_clks, dwc->clks);
+		ret = devm_clk_bulk_get_all(dev, &dwc->clks);
 		if (ret == -EPROBE_DEFER)
 			return ret;
 		/*
 		 * Clocks are optional, but new DT platforms should support all
 		 * clocks as required by the DT-binding.
 		 */
-		if (ret)
+		if (ret < 0)
 			dwc->num_clks = 0;
+		else
+			dwc->num_clks = ret;
+
 	}
 
 	ret = reset_control_deassert(dwc->reset);
-- 
2.17.1

[PATCH v6 6/8] usb: dwc3: Rework resets initialization to be more flexible

[John Stultz]

The dwc3 core binding specifies one reset.

However some variants of the hardware may have more. Previously
this was handled by using the dwc3-of-simple glue driver, but
that resulted in a proliferation of bindings for for every
variant, when the only difference was the clocks and resets
lists.

So this patch reworks the reading of the resets to fetch all the
resets specified in the dts together.

This patch was recommended by Rob Herring <robh@kernel.org>
as an alternative to creating multiple bindings for each variant
of hardware.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I4a26492f19e857f3f9f29bcdab81458016f70977
---
v3: Rework dwc3 core rather then adding another dwc-of-simple
    binding.
v6: Re-introduce this patch, on Rob's suggestion
---
 drivers/usb/dwc3/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c6316d4b7593..19504b907476 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1462,7 +1462,7 @@ static int dwc3_probe(struct platform_device *pdev)
 
 	dwc3_get_properties(dwc);
 
-	dwc->reset = devm_reset_control_get_optional_shared(dev, NULL);
+	dwc->reset = devm_reset_control_array_get(dev, true, true);
 	if (IS_ERR(dwc->reset))
 		return PTR_ERR(dwc->reset);
 
-- 
2.17.1

[PATCH v6 7/8] dt-bindings: misc: Add bindings for HiSilicon usb hub and data role switch functionality on HiKey960

[John Stultz]

From: Yu Chen <chenyu56@huawei.com>

This patch adds binding documentation to support usb hub and usb
data role switch of Hisilicon HiKey960 Board.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I3f111b39b7a982b3489549076412a2f7c3c3d008
---
v3: Reworked as usb-role-switch intermediary
---
 .../bindings/misc/hisilicon-hikey-usb.txt     | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt

diff --git a/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
new file mode 100644
index 000000000000..1e131b38230d
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.txt
@@ -0,0 +1,40 @@
+Support usb hub and usb data role switch of Hisilicon HiKey960 Board.
+
+-----------------------------
+
+Required properties:
+- compatible: "hisilicon,gpio_hubv1"
+- typec-vbus-gpios: gpio to control the vbus of typeC port
+- otg-switch-gpios: gpio to switch DP & DM between the hub and typeC port
+- hub-vdd33-en-gpios: gpio to enable the power of hub
+- pinctrl-names: pin configuration state name ("default")
+- pinctrl-0: pinctrl config
+- usb-role-switch: flags the driver as a role switch provider
+- ports: two endpoints to connect the usb core role switch provider
+	 to the usb-c tcpm driver.
+
+Example
+-----
+	hisi_hikey_usb: hisi_hikey_usb {
+		compatible = "hisilicon,gpio_hubv1";
+		typec-vbus-gpios = <&gpio25 2 GPIO_ACTIVE_HIGH>;
+		otg-switch-gpios = <&gpio25 6 GPIO_ACTIVE_HIGH>;
+		hub-vdd33-en-gpios = <&gpio5 6 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&usbhub5734_pmx_func>;
+		usb-role-switch;
+
+		port {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			hikey_usb_ep0: endpoint@0 {
+				reg = <0>;
+				remote-endpoint = <&dwc3_role_switch>;
+			};
+			hikey_usb_ep1: endpoint@1 {
+				reg = <1>;
+				remote-endpoint = <&rt1711h_ep>;
+			};
+		};
+	};
-- 
2.17.1

[PATCH v6 8/8] misc: hisi_hikey_usb: Driver to support usb functionality of Hikey960

[John Stultz]

From: Yu Chen <chenyu56@huawei.com>

The HiKey960 has a fairly complex USB configuration due to it
needing to support a USB-C port for host/device mode and multiple
USB-A ports in host mode using a single USB controller.

See schematics here:
  https://github.com/96boards/documentation/raw/master/consumer/hikey/hikey960/hardware-docs/HiKey960_Schematics.pdf

This driver acts as a usb-role-switch intermediary, intercepting
the role switch notifications from the tcpm code, and passing
them on to the dwc3 core.

In doing so, it also controls the onboard hub and power gpios in
order to properly route the data lines between the USB-C port
and the onboard hub to the USB-A ports.

NOTE: It was noted that controlling the TYPEC_VBUS_POWER_OFF and
TYPEC_VBUS_POWER_ON values here is not reccomended. I'm looking
for a way to remove that bit from the logic here, but wanted to
still get feedback on this approach.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Yu Chen <chenyu56@huawei.com>
[jstultz: Major rework to make the driver a usb-role-switch
          intermediary]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Icf381520abd46d083750d01f91e478321560fbf9
---
v3:
* Major rework to make the driver a usb-role-switch intermediary
  rather then trying to do notifier callbacks from the role switch
  logic
---
 drivers/misc/Kconfig          |   6 ++
 drivers/misc/Makefile         |   1 +
 drivers/misc/hisi_hikey_usb.c | 178 ++++++++++++++++++++++++++++++++++
 3 files changed, 185 insertions(+)
 create mode 100644 drivers/misc/hisi_hikey_usb.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 7f0d48f406e3..1d0279b77a12 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -465,6 +465,12 @@ config PVPANIC
 	  a paravirtualized device provided by QEMU; it lets a virtual machine
 	  (guest) communicate panic events to the host.
 
+config HISI_HIKEY_USB
+	tristate "USB functionality of HiSilicon Hikey Platform"
+	depends on OF && GPIOLIB
+	help
+	  If you say yes here you get support for usb functionality of HiSilicon Hikey Platform.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c1860d35dc7e..e5e85ad0dd57 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -57,3 +57,4 @@ obj-y				+= cardreader/
 obj-$(CONFIG_PVPANIC)   	+= pvpanic.o
 obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
+obj-$(CONFIG_HISI_HIKEY_USB)	+= hisi_hikey_usb.o
diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c
new file mode 100644
index 000000000000..32015bc9ccf6
--- /dev/null
+++ b/drivers/misc/hisi_hikey_usb.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for usb functionality of Hikey series boards
+ * based on Hisilicon Kirin Soc.
+ *
+ * Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
+ *		http://www.huawei.com
+ *
+ * Authors: Yu Chen <chenyu56@huawei.com>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include <linux/usb/role.h>
+
+#define DEVICE_DRIVER_NAME "hisi_hikey_usb"
+
+#define HUB_VBUS_POWER_ON 1
+#define HUB_VBUS_POWER_OFF 0
+#define USB_SWITCH_TO_HUB 1
+#define USB_SWITCH_TO_TYPEC 0
+#define TYPEC_VBUS_POWER_ON 1
+#define TYPEC_VBUS_POWER_OFF 0
+
+struct hisi_hikey_usb {
+	struct gpio_desc *otg_switch;
+	struct gpio_desc *typec_vbus;
+	struct gpio_desc *hub_vbus;
+
+	struct usb_role_switch *hub_role_sw;
+	struct usb_role_switch *dev_role_sw;
+	struct notifier_block nb;
+};
+
+static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
+{
+	gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
+}
+
+static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
+			    int switch_to)
+{
+	gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
+}
+
+static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
+				 int value)
+{
+	gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
+}
+
+static int hub_usb_role_switch_set(struct device *dev, enum usb_role role)
+{
+	struct hisi_hikey_usb *hisi_hikey_usb = dev_get_drvdata(dev);
+
+	if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
+		return -EINVAL;
+
+	switch (role) {
+	case USB_ROLE_NONE:
+		usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
+		usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
+		hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
+		break;
+	case USB_ROLE_HOST:
+		hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
+		usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
+		usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
+		break;
+	case USB_ROLE_DEVICE:
+		hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
+		usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
+		usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
+		break;
+	default:
+		break;
+	}
+
+	return usb_role_switch_set_role(hisi_hikey_usb->dev_role_sw, role);
+}
+
+static enum usb_role hub_usb_role_switch_get(struct device *dev)
+{
+	struct hisi_hikey_usb *hisi_hikey_usb = dev_get_drvdata(dev);
+
+	if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
+		return -EINVAL;
+
+	return usb_role_switch_get_role(hisi_hikey_usb->dev_role_sw);
+}
+
+static int hisi_hikey_usb_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct hisi_hikey_usb *hisi_hikey_usb;
+	struct usb_role_switch_desc hub_role_switch = {NULL};
+
+	hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
+	if (!hisi_hikey_usb)
+		return -ENOMEM;
+
+	hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
+						    GPIOD_OUT_LOW);
+	if (IS_ERR(hisi_hikey_usb->typec_vbus))
+		return PTR_ERR(hisi_hikey_usb->typec_vbus);
+
+	hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
+						    GPIOD_OUT_HIGH);
+	if (IS_ERR(hisi_hikey_usb->otg_switch))
+		return PTR_ERR(hisi_hikey_usb->otg_switch);
+
+	/* hub-vdd33-en is optional */
+	hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
+							   GPIOD_OUT_HIGH);
+	if (IS_ERR(hisi_hikey_usb->hub_vbus))
+		return PTR_ERR(hisi_hikey_usb->hub_vbus);
+
+	hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
+	if (!hisi_hikey_usb->dev_role_sw)
+		return -EPROBE_DEFER;
+	if (IS_ERR(hisi_hikey_usb->dev_role_sw))
+		return PTR_ERR(hisi_hikey_usb->dev_role_sw);
+
+	hub_role_switch.fwnode = dev_fwnode(dev);
+	hub_role_switch.set = hub_usb_role_switch_set;
+	hub_role_switch.get = hub_usb_role_switch_get;
+	hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
+							&hub_role_switch);
+
+	if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
+		usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
+		return PTR_ERR(hisi_hikey_usb->hub_role_sw);
+	}
+
+	platform_set_drvdata(pdev, hisi_hikey_usb);
+
+	return 0;
+}
+
+static int  hisi_hikey_usb_remove(struct platform_device *pdev)
+{
+	struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
+
+	if (hisi_hikey_usb->hub_role_sw)
+		usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
+
+	if (hisi_hikey_usb->dev_role_sw)
+		usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
+
+	return 0;
+}
+
+static const struct of_device_id id_table_hisi_hikey_usb[] = {
+	{.compatible = "hisilicon,gpio_hubv1"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
+
+static struct platform_driver hisi_hikey_usb_driver = {
+	.probe = hisi_hikey_usb_probe,
+	.remove = hisi_hikey_usb_remove,
+	.driver = {
+		.name = DEVICE_DRIVER_NAME,
+		.of_match_table = id_table_hisi_hikey_usb,
+	},
+};
+
+module_platform_driver(hisi_hikey_usb_driver);
+
+MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
+MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1

Re: [PATCH v6 3/8] usb: dwc3: Add support for role-switch-default-mode binding

[Bryan O'Donoghue]

On 28/11/2019 05:09, John Stultz wrote:
> Support the new role-switch-default-mode binding for configuring
> the default role the controller assumes as when the usb role is
> USB_ROLE_NONE
> 
> This patch was split out from a larger patch originally by
> Yu Chen <chenyu56@huawei.com>
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Ic6e4df1109b350deaecdc69f667d49ce91d599f3
> ---
> v3: Split this patch out from addition of usb-role-switch
>      handling
> v5: Reworked to use string based role-switch-default-mode
> ---
>   drivers/usb/dwc3/core.h |  3 +++
>   drivers/usb/dwc3/drd.c  | 25 ++++++++++++++++++++++---
>   2 files changed, 25 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 6f19e9891767..3c879c9ab1aa 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -953,6 +953,8 @@ struct dwc3_scratchpad_array {
>    *		- USBPHY_INTERFACE_MODE_UTMI
>    *		- USBPHY_INTERFACE_MODE_UTMIW
>    * @role_sw: usb_role_switch handle
> + * @role_switch_default_mode: default operation mode of controller while
> + *			usb role is USB_ROLE_NONE.
>    * @usb2_phy: pointer to USB2 PHY
>    * @usb3_phy: pointer to USB3 PHY
>    * @usb2_generic_phy: pointer to USB2 PHY
> @@ -1087,6 +1089,7 @@ struct dwc3 {
>   	struct notifier_block	edev_nb;
>   	enum usb_phy_interface	hsphy_mode;
>   	struct usb_role_switch	*role_sw;
> +	enum usb_dr_mode	role_switch_default_mode;
>   
>   	u32			fladj;
>   	u32			irq_gadget;
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index 3b57d2ddda93..865341facece 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -491,7 +491,10 @@ static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
>   		mode = DWC3_GCTL_PRTCAP_DEVICE;
>   		break;
>   	default:
> -		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
> +			mode = DWC3_GCTL_PRTCAP_HOST;
> +		else
> +			mode = DWC3_GCTL_PRTCAP_DEVICE;
>   		break;
>   	}
>   
> @@ -517,7 +520,10 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
>   		role = dwc->current_otg_role;
>   		break;
>   	default:
> -		role = USB_ROLE_DEVICE;
> +		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
> +			role = USB_ROLE_HOST;
> +		else
> +			role = USB_ROLE_DEVICE;
>   		break;
>   	}
>   	spin_unlock_irqrestore(&dwc->lock, flags);
> @@ -527,6 +533,19 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
>   static int dwc3_setup_role_switch(struct dwc3 *dwc)
>   {
>   	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +	const char *str;
> +	u32 mode;
> +	int ret;
> +
> +	ret = device_property_read_string(dwc->dev, "role-switch-default-mode",
> +					  &str);
> +	if (ret >= 0  && !strncmp(str, "host", strlen("host"))) {
> +		dwc->role_switch_default_mode = USB_DR_MODE_HOST;
> +		mode = DWC3_GCTL_PRTCAP_HOST;
> +	} else {
> +		dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +	}
>   
>   	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
>   	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> @@ -535,7 +554,7 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
>   	if (IS_ERR(dwc->role_sw))
>   		return PTR_ERR(dwc->role_sw);
>   
> -	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> +	dwc3_set_mode(dwc, mode);
>   	return 0;
>   }
>   #else
> 

I've used this on a qcs404 - it works for me.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Re: [PATCH v6 1/8] usb: dwc3: Registering a role switch in the DRD code.

[Bryan O'Donoghue]

On 28/11/2019 05:09, John Stultz wrote:
> From: Yu Chen <chenyu56@huawei.com>
> 
> The Type-C drivers use USB role switch API to inform the
> system about the negotiated data role, so registering a role
> switch in the DRD code in order to support platforms with
> USB Type-C connectors.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Ibd89b7eb3e59688895a2d317f3515e6d2705c6f3
> ---
> v2: Fix role_sw and role_switch_default_mode descriptions as
>      reported by kbuild test robot <lkp@intel.com>
> 
> v3: Split out the role-switch-default-host logic into its own
>      patch
> 
> v5: Drop selecting CONFIG_USB_ROLE_SWITCH & ifdef dependent code
> 
> v6: Fix build issue Reported-by: kbuild test robot <lkp@intel.com>
> ---
>   drivers/usb/dwc3/core.h |  3 ++
>   drivers/usb/dwc3/drd.c  | 77 ++++++++++++++++++++++++++++++++++++++++-
>   2 files changed, 79 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 1c8b349379af..6f19e9891767 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -25,6 +25,7 @@
>   #include <linux/usb/ch9.h>
>   #include <linux/usb/gadget.h>
>   #include <linux/usb/otg.h>
> +#include <linux/usb/role.h>
>   #include <linux/ulpi/interface.h>
>   
>   #include <linux/phy/phy.h>
> @@ -951,6 +952,7 @@ struct dwc3_scratchpad_array {
>    * @hsphy_mode: UTMI phy mode, one of following:
>    *		- USBPHY_INTERFACE_MODE_UTMI
>    *		- USBPHY_INTERFACE_MODE_UTMIW
> + * @role_sw: usb_role_switch handle
>    * @usb2_phy: pointer to USB2 PHY
>    * @usb3_phy: pointer to USB3 PHY
>    * @usb2_generic_phy: pointer to USB2 PHY
> @@ -1084,6 +1086,7 @@ struct dwc3 {
>   	struct extcon_dev	*edev;
>   	struct notifier_block	edev_nb;
>   	enum usb_phy_interface	hsphy_mode;
> +	struct usb_role_switch	*role_sw;
>   
>   	u32			fladj;
>   	u32			irq_gadget;
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index c946d64142ad..3b57d2ddda93 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -476,6 +476,73 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
>   	return edev;
>   }
>   
> +#ifdef CONFIG_USB_ROLE_SWITCH
> +#define ROLE_SWITCH 1
> +static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	u32 mode;
> +
> +	switch (role) {
> +	case USB_ROLE_HOST:
> +		mode = DWC3_GCTL_PRTCAP_HOST;
> +		break;
> +	case USB_ROLE_DEVICE:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	default:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	}
> +
> +	dwc3_set_mode(dwc, mode);
> +	return 0;
> +}
> +
> +static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	unsigned long flags;
> +	enum usb_role role;
> +
> +	spin_lock_irqsave(&dwc->lock, flags);
> +	switch (dwc->current_dr_role) {
> +	case DWC3_GCTL_PRTCAP_HOST:
> +		role = USB_ROLE_HOST;
> +		break;
> +	case DWC3_GCTL_PRTCAP_DEVICE:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	case DWC3_GCTL_PRTCAP_OTG:
> +		role = dwc->current_otg_role;
> +		break;
> +	default:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	}
> +	spin_unlock_irqrestore(&dwc->lock, flags);
> +	return role;
> +}
> +
> +static int dwc3_setup_role_switch(struct dwc3 *dwc)
> +{
> +	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +
> +	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
> +	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> +	dwc3_role_switch.get = dwc3_usb_role_switch_get;
> +	dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
> +	if (IS_ERR(dwc->role_sw))
> +		return PTR_ERR(dwc->role_sw);
> +
> +	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> +	return 0;
> +}
> +#else
> +#define ROLE_SWITCH 0
> +#define dwc3_setup_role_switch(x) 0
> +#endif
> +
>   int dwc3_drd_init(struct dwc3 *dwc)
>   {
>   	int ret, irq;
> @@ -484,7 +551,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
>   	if (IS_ERR(dwc->edev))
>   		return PTR_ERR(dwc->edev);
>   
> -	if (dwc->edev) {
> +	if (ROLE_SWITCH &&
> +	    device_property_read_bool(dwc->dev, "usb-role-switch")) {
> +		ret = dwc3_setup_role_switch(dwc);
> +		if (ret < 0)
> +			return ret;
> +	} else if (dwc->edev) {
>   		dwc->edev_nb.notifier_call = dwc3_drd_notifier;
>   		ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
>   					       &dwc->edev_nb);
> @@ -531,6 +603,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
>   {
>   	unsigned long flags;
>   
> +	if (dwc->role_sw)
> +		usb_role_switch_unregister(dwc->role_sw);
> +
>   	if (dwc->edev)
>   		extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
>   					   &dwc->edev_nb);
> 

This again I've used on the qcs404 and it works nicely.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Re: [PATCH v6 1/8] usb: dwc3: Registering a role switch in the DRD code.

[Bryan O'Donoghue]

On 28/11/2019 05:09, John Stultz wrote:
> From: Yu Chen <chenyu56@huawei.com>
> 
> The Type-C drivers use USB role switch API to inform the
> system about the negotiated data role, so registering a role
> switch in the DRD code in order to support platforms with
> USB Type-C connectors.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Ibd89b7eb3e59688895a2d317f3515e6d2705c6f3
> ---
> v2: Fix role_sw and role_switch_default_mode descriptions as
>      reported by kbuild test robot <lkp@intel.com>
> 
> v3: Split out the role-switch-default-host logic into its own
>      patch
> 
> v5: Drop selecting CONFIG_USB_ROLE_SWITCH & ifdef dependent code
> 
> v6: Fix build issue Reported-by: kbuild test robot <lkp@intel.com>
> ---
>   drivers/usb/dwc3/core.h |  3 ++
>   drivers/usb/dwc3/drd.c  | 77 ++++++++++++++++++++++++++++++++++++++++-
>   2 files changed, 79 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 1c8b349379af..6f19e9891767 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -25,6 +25,7 @@
>   #include <linux/usb/ch9.h>
>   #include <linux/usb/gadget.h>
>   #include <linux/usb/otg.h>
> +#include <linux/usb/role.h>
>   #include <linux/ulpi/interface.h>
>   
>   #include <linux/phy/phy.h>
> @@ -951,6 +952,7 @@ struct dwc3_scratchpad_array {
>    * @hsphy_mode: UTMI phy mode, one of following:
>    *		- USBPHY_INTERFACE_MODE_UTMI
>    *		- USBPHY_INTERFACE_MODE_UTMIW
> + * @role_sw: usb_role_switch handle
>    * @usb2_phy: pointer to USB2 PHY
>    * @usb3_phy: pointer to USB3 PHY
>    * @usb2_generic_phy: pointer to USB2 PHY
> @@ -1084,6 +1086,7 @@ struct dwc3 {
>   	struct extcon_dev	*edev;
>   	struct notifier_block	edev_nb;
>   	enum usb_phy_interface	hsphy_mode;
> +	struct usb_role_switch	*role_sw;
>   
>   	u32			fladj;
>   	u32			irq_gadget;
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index c946d64142ad..3b57d2ddda93 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -476,6 +476,73 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
>   	return edev;
>   }
>   
> +#ifdef CONFIG_USB_ROLE_SWITCH
> +#define ROLE_SWITCH 1
> +static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	u32 mode;
> +
> +	switch (role) {
> +	case USB_ROLE_HOST:
> +		mode = DWC3_GCTL_PRTCAP_HOST;
> +		break;
> +	case USB_ROLE_DEVICE:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	default:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	}
> +
> +	dwc3_set_mode(dwc, mode);
> +	return 0;
> +}
> +
> +static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	unsigned long flags;
> +	enum usb_role role;
> +
> +	spin_lock_irqsave(&dwc->lock, flags);
> +	switch (dwc->current_dr_role) {
> +	case DWC3_GCTL_PRTCAP_HOST:
> +		role = USB_ROLE_HOST;
> +		break;
> +	case DWC3_GCTL_PRTCAP_DEVICE:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	case DWC3_GCTL_PRTCAP_OTG:
> +		role = dwc->current_otg_role;
> +		break;
> +	default:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	}
> +	spin_unlock_irqrestore(&dwc->lock, flags);
> +	return role;
> +}
> +
> +static int dwc3_setup_role_switch(struct dwc3 *dwc)
> +{
> +	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +
> +	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
> +	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> +	dwc3_role_switch.get = dwc3_usb_role_switch_get;
> +	dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
> +	if (IS_ERR(dwc->role_sw))
> +		return PTR_ERR(dwc->role_sw);
> +
> +	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> +	return 0;
> +}
> +#else
> +#define ROLE_SWITCH 0
> +#define dwc3_setup_role_switch(x) 0
> +#endif
> +
>   int dwc3_drd_init(struct dwc3 *dwc)
>   {
>   	int ret, irq;
> @@ -484,7 +551,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
>   	if (IS_ERR(dwc->edev))
>   		return PTR_ERR(dwc->edev);
>   
> -	if (dwc->edev) {
> +	if (ROLE_SWITCH &&
> +	    device_property_read_bool(dwc->dev, "usb-role-switch")) {
> +		ret = dwc3_setup_role_switch(dwc);
> +		if (ret < 0)
> +			return ret;
> +	} else if (dwc->edev) {
>   		dwc->edev_nb.notifier_call = dwc3_drd_notifier;
>   		ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
>   					       &dwc->edev_nb);
> @@ -531,6 +603,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
>   {
>   	unsigned long flags;
>   
> +	if (dwc->role_sw)
> +		usb_role_switch_unregister(dwc->role_sw);
> +
>   	if (dwc->edev)
>   		extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
>   					   &dwc->edev_nb);
> 

Try again ;)

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Re: [PATCH v6 3/8] usb: dwc3: Add support for role-switch-default-mode binding

[Bryan O'Donoghue]

On 28/11/2019 05:09, John Stultz wrote:
> Support the new role-switch-default-mode binding for configuring
> the default role the controller assumes as when the usb role is
> USB_ROLE_NONE
> 
> This patch was split out from a larger patch originally by
> Yu Chen <chenyu56@huawei.com>
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Ic6e4df1109b350deaecdc69f667d49ce91d599f3
> ---
> v3: Split this patch out from addition of usb-role-switch
>      handling
> v5: Reworked to use string based role-switch-default-mode
> ---
>   drivers/usb/dwc3/core.h |  3 +++
>   drivers/usb/dwc3/drd.c  | 25 ++++++++++++++++++++++---
>   2 files changed, 25 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 6f19e9891767..3c879c9ab1aa 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -953,6 +953,8 @@ struct dwc3_scratchpad_array {
>    *		- USBPHY_INTERFACE_MODE_UTMI
>    *		- USBPHY_INTERFACE_MODE_UTMIW
>    * @role_sw: usb_role_switch handle
> + * @role_switch_default_mode: default operation mode of controller while
> + *			usb role is USB_ROLE_NONE.
>    * @usb2_phy: pointer to USB2 PHY
>    * @usb3_phy: pointer to USB3 PHY
>    * @usb2_generic_phy: pointer to USB2 PHY
> @@ -1087,6 +1089,7 @@ struct dwc3 {
>   	struct notifier_block	edev_nb;
>   	enum usb_phy_interface	hsphy_mode;
>   	struct usb_role_switch	*role_sw;
> +	enum usb_dr_mode	role_switch_default_mode;
>   
>   	u32			fladj;
>   	u32			irq_gadget;
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index 3b57d2ddda93..865341facece 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -491,7 +491,10 @@ static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
>   		mode = DWC3_GCTL_PRTCAP_DEVICE;
>   		break;
>   	default:
> -		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
> +			mode = DWC3_GCTL_PRTCAP_HOST;
> +		else
> +			mode = DWC3_GCTL_PRTCAP_DEVICE;
>   		break;
>   	}
>   
> @@ -517,7 +520,10 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
>   		role = dwc->current_otg_role;
>   		break;
>   	default:
> -		role = USB_ROLE_DEVICE;
> +		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
> +			role = USB_ROLE_HOST;
> +		else
> +			role = USB_ROLE_DEVICE;
>   		break;
>   	}
>   	spin_unlock_irqrestore(&dwc->lock, flags);
> @@ -527,6 +533,19 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
>   static int dwc3_setup_role_switch(struct dwc3 *dwc)
>   {
>   	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +	const char *str;
> +	u32 mode;
> +	int ret;
> +
> +	ret = device_property_read_string(dwc->dev, "role-switch-default-mode",
> +					  &str);
> +	if (ret >= 0  && !strncmp(str, "host", strlen("host"))) {
> +		dwc->role_switch_default_mode = USB_DR_MODE_HOST;
> +		mode = DWC3_GCTL_PRTCAP_HOST;
> +	} else {
> +		dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +	}
>   
>   	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
>   	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> @@ -535,7 +554,7 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
>   	if (IS_ERR(dwc->role_sw))
>   		return PTR_ERR(dwc->role_sw);
>   
> -	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> +	dwc3_set_mode(dwc, mode);
>   	return 0;
>   }
>   #else
> 

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Re: [PATCH v6 8/8] misc: hisi_hikey_usb: Driver to support usb functionality of Hikey960

[Greg Kroah-Hartman]

On Thu, Nov 28, 2019 at 05:10:01AM +0000, John Stultz wrote:
> From: Yu Chen <chenyu56@huawei.com>
> 
> The HiKey960 has a fairly complex USB configuration due to it
> needing to support a USB-C port for host/device mode and multiple
> USB-A ports in host mode using a single USB controller.
> 
> See schematics here:
>   https://github.com/96boards/documentation/raw/master/consumer/hikey/hikey960/hardware-docs/HiKey960_Schematics.pdf
> 
> This driver acts as a usb-role-switch intermediary, intercepting
> the role switch notifications from the tcpm code, and passing
> them on to the dwc3 core.
> 
> In doing so, it also controls the onboard hub and power gpios in
> order to properly route the data lines between the USB-C port
> and the onboard hub to the USB-A ports.
> 
> NOTE: It was noted that controlling the TYPEC_VBUS_POWER_OFF and
> TYPEC_VBUS_POWER_ON values here is not reccomended. I'm looking
> for a way to remove that bit from the logic here, but wanted to
> still get feedback on this approach.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> [jstultz: Major rework to make the driver a usb-role-switch
>           intermediary]
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Icf381520abd46d083750d01f91e478321560fbf9

Checkpatch is your friend :)