[PATCH 1/3] phy: qcom-qmp-usb-ss: add shared SS-link-state submode contract

[Tapas Rana <tapas.rana@oss.qualcomm.com>]

dwc3 core only calls phy_set_mode()/phy_set_mode_ext() with the base
PHY_MODE_USB_HOST or PHY_MODE_USB_DEVICE. It never passes the
PHY_MODE_USB_{HOST,DEVICE}_SS/HS/FS/LS submode values to any PHY
driver. However, QMP PHY drivers need to know whether a SuperSpeed
link is present to select the correct autonomous-mode wake interrupt
mask, and phy_mode alone cannot carry that.

Add enum qcom_usb_ss_state (UNKNOWN/PRESENT/ABSENT) and carry it
through the existing submode argument of phy_set_mode_ext(), instead
of extending enum phy_mode further. UNKNOWN is the default so callers
that do not yet pass a real value keep current behavior.

Signed-off-by: Tapas Rana <tapas.rana@oss.qualcomm.com>
---
 include/linux/phy/phy-qcom-qmp-usb-ss.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 include/linux/phy/phy-qcom-qmp-usb-ss.h

diff --git a/include/linux/phy/phy-qcom-qmp-usb-ss.h b/include/linux/phy/phy-qcom-qmp-usb-ss.h
new file mode 100644
index 000000000000..4da4d71e977d
--- /dev/null
+++ b/include/linux/phy/phy-qcom-qmp-usb-ss.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared submode contract between dwc3-qcom glue and the Qualcomm QMP
+ * USB3/combo PHY driver for communicating live SuperSpeed link presence
+ * at suspend-entry, via phy_set_mode_ext()'s submode argument.
+ */
+
+#ifndef _PHY_QCOM_QMP_USB_SS_H_
+#define _PHY_QCOM_QMP_USB_SS_H_
+
+enum qcom_usb_ss_state {
+	QCOM_USB_SS_UNKNOWN = 0,
+	QCOM_USB_SS_PRESENT,
+	QCOM_USB_SS_ABSENT,
+};
+
+#endif /* _PHY_QCOM_QMP_USB_SS_H_ */
-- 
2.43.0