MLK-19850-6 usb: chipidea: introduce flag for enable USB PHY charger detection

Some platforms may want to use USB PHY charger detection function
when VBUS is there, add one flag for it. The user can enable it
at firmware.

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt

@@ -79,6 +79,7 @@ Optional properties:
   maximum_periodic_data_per_frame. The use case is multiple transactions, but
   less frame rate.
 - ci-disable-lpm: Some chipidea hardware need to disable low power mode
+- phy-charger-detection: enable USB PHY charger detection function
 
 i.mx specific properties
 - fsl,usbmisc: phandler of non-core register device, with one

drivers/usb/chipidea/core.c

@@ -690,6 +690,12 @@ static int ci_get_platdata(struct device *dev,
 	if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 		platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 
+	/* "imx-usb-charger-detection is legacy compatible */
+	if (of_find_property(dev->of_node, "phy-charger-detection", NULL) ||
+		of_find_property(dev->of_node, "imx-usb-charger-detection",
+			NULL))
+		platdata->flags |= CI_HDRC_PHY_CHARGER_DETECTION;
+
 	ext_id = ERR_PTR(-ENODEV);
 	ext_vbus = ERR_PTR(-ENODEV);
 	if (of_property_read_bool(dev->of_node, "extcon")) {

drivers/usb/chipidea/udc.c

@@ -2016,6 +2016,9 @@ int ci_usb_charger_connect(struct ci_hdrc *ci, int is_active)
 	if (is_active)
 		pm_runtime_get_sync(ci->dev);
 
+	if (!(ci->platdata->flags & CI_HDRC_PHY_CHARGER_DETECTION))
+		goto out;
+
 	if (ci->usb_phy->charger_detect) {
 		usb_phy_set_charger_state(ci->usb_phy, is_active ?
 			USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
@@ -2036,6 +2039,7 @@ int ci_usb_charger_connect(struct ci_hdrc *ci, int is_active)
 		}
 		schedule_work(&ci->usb_phy->chg_work);
 	}
+out:
 
 	if (!is_active)
 		pm_runtime_put_sync(ci->dev);

include/linux/usb/chipidea.h

@@ -64,6 +64,8 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_IMX_IS_HSIC		BIT(15)
 /* need request pmqos during low power */
 #define CI_HDRC_PMQOS			BIT(16)
+/* Using PHY's charger detection */
+#define CI_HDRC_PHY_CHARGER_DETECTION	BIT(17)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1