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

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