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[v6,0/8] HiKey960 USB support

Message ID 20191128051001.18995-1-john.stultz@linaro.org
Headers show
Series HiKey960 USB support | expand

Message

John Stultz Nov. 28, 2019, 5:09 a.m. UTC 
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

Comments

Bryan O'Donoghue Dec. 2, 2019, 10:32 a.m. UTC | #1 
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>
Bryan O'Donoghue Dec. 2, 2019, 10:33 a.m. UTC | #2 
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>
Bryan O'Donoghue Dec. 2, 2019, 10:33 a.m. UTC | #3 
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>
Bryan O'Donoghue Dec. 2, 2019, 10:34 a.m. UTC | #4 
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>
gregkh@linuxfoundation.org Dec. 10, 2019, 10:26 a.m. UTC | #5 
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 :)