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Tue, 25 Feb 2020 09:53:49 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Greg Kroah-Hartman , Rob Herring , Mark Rutland , ShuFan Lee , Heikki Krogerus , Suzuki K Poulose , Chunfeng Yun , Yu Chen , Felipe Balbi , Hans de Goede , Andy Shevchenko , Jun Li , Valentin Schneider , Guillaume Gardet , Bryan O'Donoghue , Jack Pham , linux-usb@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v8 3/6] usb: dwc3: Add support for role-switch-default-mode binding Date: Tue, 25 Feb 2020 17:53:01 +0000 Message-Id: <20200225175304.36406-4-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200225175304.36406-1-john.stultz@linaro.org> References: <20200225175304.36406-1-john.stultz@linaro.org> 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 Cc: Greg Kroah-Hartman Cc: Rob Herring Cc: Mark Rutland CC: ShuFan Lee Cc: Heikki Krogerus Cc: Suzuki K Poulose Cc: Chunfeng Yun Cc: Yu Chen Cc: Felipe Balbi Cc: Hans de Goede Cc: Andy Shevchenko Cc: Jun Li Cc: Valentin Schneider Cc: Guillaume Gardet Cc: Bryan O'Donoghue Cc: Jack Pham Cc: linux-usb@vger.kernel.org Cc: devicetree@vger.kernel.org Tested-by: Bryan O'Donoghue Signed-off-by: John Stultz --- 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(-) -- 2.17.1 diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index a99e57636172..57d549a1ad0b 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -955,6 +955,8 @@ 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 @@ -1089,6 +1091,7 @@ 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 331c6e997f0c..db68d48c2267 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