[PATCH v3 0/3] Introduce one extcon device into usb phy

[PATCH v3 0/3] Introduce one extcon device into usb phy

[Baolin Wang]

This patchset introduces one pointer of extcon device into usb phy
structure, and some other helper functions to register extcon instead
of each phy driver having its own related extcon APIs.

Changes since v2:
 - Support separate extcon device.
 - Convert the phy-msm-usb driver.

Changes since v1:
 - Fix build errors with random config.

Baolin Wang (3):
  usb: phy: Introduce one extcon device into usb phy
  usb: phy: phy-qcom-8x16-usb: Remove redundant extcon
    register/unregister
  usb: phy: phy-msm-usb: Remove redundant extcon register/unregister

 drivers/usb/phy/Kconfig             |    6 +--
 drivers/usb/phy/phy-msm-usb.c       |   85 ++++++++---------------------------
 drivers/usb/phy/phy-qcom-8x16-usb.c |   20 +++------
 drivers/usb/phy/phy.c               |   57 +++++++++++++++++++++++
 include/linux/usb/phy.h             |    7 +++
 5 files changed, 90 insertions(+), 85 deletions(-)

-- 
1.7.9.5

[PATCH v3 1/3] usb: phy: Introduce one extcon device into usb phy

[Baolin Wang]

Usually usb phy need register one extcon device to get the connection
notifications. It will remove some duplicate code if the extcon device
is registered using common code instead of each phy driver having its
own related extcon APIs. So we add one pointer of extcon device into
usb phy structure, and some other helper functions to register extcon.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
 drivers/usb/phy/Kconfig |    6 ++---
 drivers/usb/phy/phy.c   |   57 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/phy.h |    7 ++++++
 3 files changed, 67 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 61cef75..c9c61a8 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -4,6 +4,7 @@
 menu "USB Physical Layer drivers"
 
 config USB_PHY
+	select EXTCON
 	def_bool n
 
 #
@@ -116,7 +117,7 @@ config OMAP_OTG
 
 config TAHVO_USB
 	tristate "Tahvo USB transceiver driver"
-	depends on MFD_RETU && EXTCON
+	depends on MFD_RETU
 	depends on USB_GADGET || !USB_GADGET # if USB_GADGET=m, this can't be 'y'
 	select USB_PHY
 	help
@@ -148,7 +149,6 @@ config USB_MSM_OTG
 	depends on (USB || USB_GADGET) && (ARCH_QCOM || COMPILE_TEST)
 	depends on USB_GADGET || !USB_GADGET # if USB_GADGET=m, this can't be 'y'
 	depends on RESET_CONTROLLER
-	depends on EXTCON
 	select USB_PHY
 	help
 	  Enable this to support the USB OTG transceiver on Qualcomm chips. It
@@ -162,7 +162,7 @@ config USB_MSM_OTG
 config USB_QCOM_8X16_PHY
 	tristate "Qualcomm APQ8016/MSM8916 on-chip USB PHY controller support"
 	depends on ARCH_QCOM || COMPILE_TEST
-	depends on RESET_CONTROLLER && EXTCON
+	depends on RESET_CONTROLLER
 	select USB_PHY
 	select USB_ULPI_VIEWPORT
 	help
diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c
index 98f75d2..032f5af 100644
--- a/drivers/usb/phy/phy.c
+++ b/drivers/usb/phy/phy.c
@@ -100,6 +100,54 @@ static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
 	return *phy == match_data;
 }
 
+static int usb_add_extcon(struct usb_phy *x)
+{
+	int ret;
+
+	if (of_property_read_bool(x->dev->of_node, "extcon")) {
+		x->edev = extcon_get_edev_by_phandle(x->dev, 0);
+		if (IS_ERR(x->edev))
+			return PTR_ERR(x->edev);
+
+		x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
+		if (IS_ERR(x->id_edev)) {
+			x->id_edev = NULL;
+			dev_info(x->dev, "No separate ID extcon device\n");
+		}
+
+		if (x->vbus_nb.notifier_call) {
+			ret = devm_extcon_register_notifier(x->dev, x->edev,
+							    EXTCON_USB,
+							    &x->vbus_nb);
+			if (ret < 0) {
+				dev_err(x->dev,
+					"register VBUS notifier failed\n");
+				return ret;
+			}
+		}
+
+		if (x->id_nb.notifier_call) {
+			struct extcon_dev *id_ext;
+
+			if (x->id_edev)
+				id_ext = x->id_edev;
+			else
+				id_ext = x->edev;
+
+			ret = devm_extcon_register_notifier(x->dev, id_ext,
+							    EXTCON_USB_HOST,
+							    &x->id_nb);
+			if (ret < 0) {
+				dev_err(x->dev,
+					"register ID notifier failed\n");
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
 /**
  * devm_usb_get_phy - find the USB PHY
  * @dev - device that requests this phy
@@ -388,6 +436,10 @@ int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
 		return -EINVAL;
 	}
 
+	ret = usb_add_extcon(x);
+	if (ret)
+		return ret;
+
 	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
 
 	spin_lock_irqsave(&phy_lock, flags);
@@ -422,12 +474,17 @@ int usb_add_phy_dev(struct usb_phy *x)
 {
 	struct usb_phy_bind *phy_bind;
 	unsigned long flags;
+	int ret;
 
 	if (!x->dev) {
 		dev_err(x->dev, "no device provided for PHY\n");
 		return -EINVAL;
 	}
 
+	ret = usb_add_extcon(x);
+	if (ret)
+		return ret;
+
 	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
 
 	spin_lock_irqsave(&phy_lock, flags);
diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index 31a8068..2992451 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -9,6 +9,7 @@
 #ifndef __LINUX_USB_PHY_H
 #define __LINUX_USB_PHY_H
 
+#include <linux/extcon.h>
 #include <linux/notifier.h>
 #include <linux/usb.h>
 
@@ -85,6 +86,12 @@ struct usb_phy {
 	struct usb_phy_io_ops	*io_ops;
 	void __iomem		*io_priv;
 
+	/* to support extcon device */
+	struct extcon_dev	*edev;
+	struct extcon_dev	*id_edev;
+	struct notifier_block	vbus_nb;
+	struct notifier_block	id_nb;
+
 	/* for notification of usb_phy_events */
 	struct atomic_notifier_head	notifier;
 
-- 
1.7.9.5

[PATCH v3 2/3] usb: phy: phy-qcom-8x16-usb: Remove redundant extcon register/unregister

[Baolin Wang]

Since usb phy core has added common code to register or unregister
extcon device, then phy-qcom-8x16-usb driver does not need its own
code to register/unregister extcon device, then remove them.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
 drivers/usb/phy/phy-qcom-8x16-usb.c |   20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/phy/phy-qcom-8x16-usb.c b/drivers/usb/phy/phy-qcom-8x16-usb.c
index fdf6863..b6a83a5 100644
--- a/drivers/usb/phy/phy-qcom-8x16-usb.c
+++ b/drivers/usb/phy/phy-qcom-8x16-usb.c
@@ -69,9 +69,6 @@ struct phy_8x16 {
 
 	struct reset_control		*phy_reset;
 
-	struct extcon_dev		*vbus_edev;
-	struct notifier_block		vbus_notify;
-
 	struct gpio_desc		*switch_gpio;
 	struct notifier_block		reboot_notify;
 };
@@ -131,7 +128,8 @@ static int phy_8x16_vbus_off(struct phy_8x16 *qphy)
 static int phy_8x16_vbus_notify(struct notifier_block *nb, unsigned long event,
 				void *ptr)
 {
-	struct phy_8x16 *qphy = container_of(nb, struct phy_8x16, vbus_notify);
+	struct usb_phy *usb_phy = container_of(nb, struct usb_phy, vbus_nb);
+	struct phy_8x16 *qphy = container_of(usb_phy, struct phy_8x16, phy);
 
 	if (event)
 		phy_8x16_vbus_on(qphy);
@@ -187,7 +185,7 @@ static int phy_8x16_init(struct usb_phy *phy)
 	val = ULPI_PWR_OTG_COMP_DISABLE;
 	usb_phy_io_write(phy, val, ULPI_SET(ULPI_PWR_CLK_MNG_REG));
 
-	state = extcon_get_state(qphy->vbus_edev, EXTCON_USB);
+	state = extcon_get_state(qphy->phy.edev, EXTCON_USB);
 	if (state)
 		phy_8x16_vbus_on(qphy);
 	else
@@ -289,15 +287,13 @@ static int phy_8x16_probe(struct platform_device *pdev)
 	phy->io_priv		= qphy->regs + HSPHY_ULPI_VIEWPORT;
 	phy->io_ops		= &ulpi_viewport_access_ops;
 	phy->type		= USB_PHY_TYPE_USB2;
+	phy->vbus_nb.notifier_call = phy_8x16_vbus_notify;
+	phy->id_nb.notifier_call = NULL;
 
 	ret = phy_8x16_read_devicetree(qphy);
 	if (ret < 0)
 		return ret;
 
-	qphy->vbus_edev = extcon_get_edev_by_phandle(phy->dev, 0);
-	if (IS_ERR(qphy->vbus_edev))
-		return PTR_ERR(qphy->vbus_edev);
-
 	ret = clk_set_rate(qphy->core_clk, INT_MAX);
 	if (ret < 0)
 		dev_dbg(phy->dev, "Can't boost core clock\n");
@@ -315,12 +311,6 @@ static int phy_8x16_probe(struct platform_device *pdev)
 	if (WARN_ON(ret))
 		goto off_clks;
 
-	qphy->vbus_notify.notifier_call = phy_8x16_vbus_notify;
-	ret = devm_extcon_register_notifier(&pdev->dev, qphy->vbus_edev,
-					EXTCON_USB, &qphy->vbus_notify);
-	if (ret < 0)
-		goto off_power;
-
 	ret = usb_add_phy_dev(&qphy->phy);
 	if (ret)
 		goto off_power;
-- 
1.7.9.5

[PATCH v3 3/3] usb: phy: phy-msm-usb: Remove redundant extcon register/unregister

[Baolin Wang]

Since usb phy core has added common code to register or unregister
extcon device, then phy-msm-usb driver does not need its own
code to register/unregister extcon device, then remove them.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
 drivers/usb/phy/phy-msm-usb.c |   85 +++++++++--------------------------------
 1 file changed, 18 insertions(+), 67 deletions(-)

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 93d9aaa..8fb86a5 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -146,17 +146,6 @@ struct msm_otg_platform_data {
 };
 
 /**
- * struct msm_usb_cable - structure for exteternal connector cable
- *			  state tracking
- * @nb: hold event notification callback
- * @conn: used for notification registration
- */
-struct msm_usb_cable {
-	struct notifier_block		nb;
-	struct extcon_dev		*extcon;
-};
-
-/**
  * struct msm_otg: OTG driver data. Shared by HCD and DCD.
  * @otg: USB OTG Transceiver structure.
  * @pdata: otg device platform data.
@@ -215,9 +204,6 @@ struct msm_otg {
 
 	bool manual_pullup;
 
-	struct msm_usb_cable vbus;
-	struct msm_usb_cable id;
-
 	struct gpio_desc *switch_gpio;
 	struct notifier_block reboot;
 };
@@ -1612,8 +1598,8 @@ static void msm_otg_debugfs_cleanup(void)
 static int msm_otg_vbus_notifier(struct notifier_block *nb, unsigned long event,
 				void *ptr)
 {
-	struct msm_usb_cable *vbus = container_of(nb, struct msm_usb_cable, nb);
-	struct msm_otg *motg = container_of(vbus, struct msm_otg, vbus);
+	struct usb_phy *usb_phy = container_of(nb, struct usb_phy, vbus_nb);
+	struct msm_otg *motg = container_of(usb_phy, struct msm_otg, phy);
 
 	if (event)
 		set_bit(B_SESS_VLD, &motg->inputs);
@@ -1636,8 +1622,8 @@ static int msm_otg_vbus_notifier(struct notifier_block *nb, unsigned long event,
 static int msm_otg_id_notifier(struct notifier_block *nb, unsigned long event,
 				void *ptr)
 {
-	struct msm_usb_cable *id = container_of(nb, struct msm_usb_cable, nb);
-	struct msm_otg *motg = container_of(id, struct msm_otg, id);
+	struct usb_phy *usb_phy = container_of(nb, struct usb_phy, id_nb);
+	struct msm_otg *motg = container_of(usb_phy, struct msm_otg, phy);
 
 	if (event)
 		clear_bit(ID, &motg->inputs);
@@ -1652,7 +1638,6 @@ static int msm_otg_id_notifier(struct notifier_block *nb, unsigned long event,
 static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 {
 	struct msm_otg_platform_data *pdata;
-	struct extcon_dev *ext_id, *ext_vbus;
 	struct device_node *node = pdev->dev.of_node;
 	struct property *prop;
 	int len, ret, words;
@@ -1708,54 +1693,6 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 	if (IS_ERR(motg->switch_gpio))
 		return PTR_ERR(motg->switch_gpio);
 
-	ext_id = ERR_PTR(-ENODEV);
-	ext_vbus = ERR_PTR(-ENODEV);
-	if (of_property_read_bool(node, "extcon")) {
-
-		/* Each one of them is not mandatory */
-		ext_vbus = extcon_get_edev_by_phandle(&pdev->dev, 0);
-		if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
-			return PTR_ERR(ext_vbus);
-
-		ext_id = extcon_get_edev_by_phandle(&pdev->dev, 1);
-		if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
-			return PTR_ERR(ext_id);
-	}
-
-	if (!IS_ERR(ext_vbus)) {
-		motg->vbus.extcon = ext_vbus;
-		motg->vbus.nb.notifier_call = msm_otg_vbus_notifier;
-		ret = devm_extcon_register_notifier(&pdev->dev, ext_vbus,
-						EXTCON_USB, &motg->vbus.nb);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "register VBUS notifier failed\n");
-			return ret;
-		}
-
-		ret = extcon_get_state(ext_vbus, EXTCON_USB);
-		if (ret)
-			set_bit(B_SESS_VLD, &motg->inputs);
-		else
-			clear_bit(B_SESS_VLD, &motg->inputs);
-	}
-
-	if (!IS_ERR(ext_id)) {
-		motg->id.extcon = ext_id;
-		motg->id.nb.notifier_call = msm_otg_id_notifier;
-		ret = devm_extcon_register_notifier(&pdev->dev, ext_id,
-						EXTCON_USB_HOST, &motg->id.nb);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "register ID notifier failed\n");
-			return ret;
-		}
-
-		ret = extcon_get_state(ext_id, EXTCON_USB_HOST);
-		if (ret)
-			clear_bit(ID, &motg->inputs);
-		else
-			set_bit(ID, &motg->inputs);
-	}
-
 	prop = of_find_property(node, "qcom,phy-init-sequence", &len);
 	if (!prop || !len)
 		return 0;
@@ -1932,6 +1869,8 @@ static int msm_otg_probe(struct platform_device *pdev)
 	phy->init = msm_phy_init;
 	phy->notify_disconnect = msm_phy_notify_disconnect;
 	phy->type = USB_PHY_TYPE_USB2;
+	phy->vbus_nb.notifier_call = msm_otg_vbus_notifier;
+	phy->id_nb.notifier_call = msm_otg_id_notifier;
 
 	phy->io_ops = &msm_otg_io_ops;
 
@@ -1947,6 +1886,18 @@ static int msm_otg_probe(struct platform_device *pdev)
 		goto disable_ldo;
 	}
 
+	ret = extcon_get_state(phy->edev, EXTCON_USB);
+	if (ret)
+		set_bit(B_SESS_VLD, &motg->inputs);
+	else
+		clear_bit(B_SESS_VLD, &motg->inputs);
+
+	ret = extcon_get_state(phy->id_edev, EXTCON_USB_HOST);
+	if (ret)
+		clear_bit(ID, &motg->inputs);
+	else
+		set_bit(ID, &motg->inputs);
+
 	platform_set_drvdata(pdev, motg);
 	device_init_wakeup(&pdev->dev, 1);
 
-- 
1.7.9.5