[PATCH v5 0/3] Add support for VBUS detection

[PATCH v5 0/3] Add support for VBUS detection

[Guru Das Srinagesh]

Add support to enable VBUS detection in the pm8941 extcon driver.

Changes from v4:
- Drop addition of new compatible string in both bindings and driver.

Changes from v3:
- Split bindings into direct conversion of txt file, and addition of VBUS
  detection support.

Changes from v2:
- Fix YAML errors in dt binding document.

Changes from v1:
- Change bindings from txt to YAML.


Anirudh Ghayal (1):
  extcon: qcom-spmi: Add support for VBUS detection

Guru Das Srinagesh (2):
  bindings: pm8941-misc: Convert bindings to YAML
  bindings: pm8941-misc: Add support for VBUS detection

 .../bindings/extcon/qcom,pm8941-misc.txt           | 41 ---------
 .../bindings/extcon/qcom,pm8941-misc.yaml          | 62 ++++++++++++++
 drivers/extcon/extcon-qcom-spmi-misc.c             | 99 +++++++++++++++++-----
 3 files changed, 142 insertions(+), 60 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt
 create mode 100644 Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v5 1/3] bindings: pm8941-misc: Convert bindings to YAML

[Guru Das Srinagesh]

Convert bindings from txt to YAML.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/extcon/qcom,pm8941-misc.txt           | 41 ---------------
 .../bindings/extcon/qcom,pm8941-misc.yaml          | 59 ++++++++++++++++++++++
 2 files changed, 59 insertions(+), 41 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt
 create mode 100644 Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml

diff --git a/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt b/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt
deleted file mode 100644
index 35383adb..0000000
--- a/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.txt
+++ /dev/null
@@ -1,41 +0,0 @@
-Qualcomm's PM8941 USB ID Extcon device
-
-Some Qualcomm PMICs have a "misc" module that can be used to detect when
-the USB ID pin has been pulled low or high.
-
-PROPERTIES
-
-- compatible:
-    Usage: required
-    Value type: <string>
-    Definition: Should contain "qcom,pm8941-misc";
-
-- reg:
-    Usage: required
-    Value type: <u32>
-    Definition: Should contain the offset to the misc address space
-
-- interrupts:
-    Usage: required
-    Value type: <prop-encoded-array>
-    Definition: Should contain the usb id interrupt
-
-- interrupt-names:
-    Usage: required
-    Value type: <stringlist>
-    Definition: Should contain the string "usb_id" for the usb id interrupt
-
-Example:
-
-	pmic {
-		usb_id: misc@900 {
-			compatible = "qcom,pm8941-misc";
-			reg = <0x900>;
-			interrupts = <0x0 0x9 0 IRQ_TYPE_EDGE_BOTH>;
-			interrupt-names = "usb_id";
-		};
-	}
-
-	usb-controller {
-		extcon = <&usb_id>;
-	};
diff --git a/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml b/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml
new file mode 100644
index 0000000..e8eea83
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/extcon/qcom,pm8941-misc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. PM8941 USB ID Extcon device
+
+maintainers:
+  - Guru Das Srinagesh <gurus@codeaurora.org>
+
+description: |
+  Some Qualcomm PMICs have a "misc" module that can be used to detect when
+  the USB ID pin has been pulled low or high.
+
+properties:
+  compatible:
+    items:
+      - const: qcom,pm8941-misc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    items:
+      - const: usb_id
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pmic {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            interrupt-controller;
+            #interrupt-cells = <4>;
+
+            usb_id: misc@900 {
+                    compatible = "qcom,pm8941-misc";
+                    reg = <0x900>;
+                    interrupts = <0x0 0x9 0 IRQ_TYPE_EDGE_BOTH>;
+                    interrupt-names = "usb_id";
+            };
+    };
+
+    usb-controller {
+           extcon = <&usb_id>;
+    };
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v5 2/3] bindings: pm8941-misc: Add support for VBUS detection

[Guru Das Srinagesh]

Add interrupt support for reporting VBUS detection status that can be
detected via a dedicated PMIC pin.

Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
 Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml b/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml
index e8eea83..6a9c96f 100644
--- a/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml
+++ b/Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml
@@ -22,11 +22,14 @@ properties:
     maxItems: 1
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   interrupt-names:
+    minItems: 1
     items:
       - const: usb_id
+      - const: usb_vbus
 
 required:
   - compatible
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v5 3/3] extcon: qcom-spmi: Add support for VBUS detection

[Guru Das Srinagesh]

From: Anirudh Ghayal <aghayal@codeaurora.org>

VBUS can be detected via a dedicated PMIC pin. Add support
for reporting the VBUS status.

Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Kavya Nunna <knunna@codeaurora.org>
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
 drivers/extcon/extcon-qcom-spmi-misc.c | 99 +++++++++++++++++++++++++++-------
 1 file changed, 80 insertions(+), 19 deletions(-)

diff --git a/drivers/extcon/extcon-qcom-spmi-misc.c b/drivers/extcon/extcon-qcom-spmi-misc.c
index 6b836ae..9e8ccfb 100644
--- a/drivers/extcon/extcon-qcom-spmi-misc.c
+++ b/drivers/extcon/extcon-qcom-spmi-misc.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /**
  * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
- *				detection based on extcon-usb-gpio.c.
+ *			and VBUS detection based on extcon-usb-gpio.c.
  *
  * Copyright (C) 2016 Linaro, Ltd.
  * Stephen Boyd <stephen.boyd@linaro.org>
@@ -21,30 +21,56 @@
 
 struct qcom_usb_extcon_info {
 	struct extcon_dev *edev;
-	int irq;
+	int id_irq;
+	int vbus_irq;
 	struct delayed_work wq_detcable;
 	unsigned long debounce_jiffies;
 };
 
 static const unsigned int qcom_usb_extcon_cable[] = {
+	EXTCON_USB,
 	EXTCON_USB_HOST,
 	EXTCON_NONE,
 };
 
 static void qcom_usb_extcon_detect_cable(struct work_struct *work)
 {
-	bool id;
+	bool state = false;
 	int ret;
+	union extcon_property_value val;
 	struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
 						    struct qcom_usb_extcon_info,
 						    wq_detcable);
 
-	/* check ID and update cable state */
-	ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
-	if (ret)
-		return;
+	if (info->id_irq > 0) {
+		/* check ID and update cable state */
+		ret = irq_get_irqchip_state(info->id_irq,
+				IRQCHIP_STATE_LINE_LEVEL, &state);
+		if (ret)
+			return;
+
+		if (!state) {
+			val.intval = true;
+			extcon_set_property(info->edev, EXTCON_USB_HOST,
+						EXTCON_PROP_USB_SS, val);
+		}
+		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !state);
+	}
 
-	extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
+	if (info->vbus_irq > 0) {
+		/* check VBUS and update cable state */
+		ret = irq_get_irqchip_state(info->vbus_irq,
+				IRQCHIP_STATE_LINE_LEVEL, &state);
+		if (ret)
+			return;
+
+		if (state) {
+			val.intval = true;
+			extcon_set_property(info->edev, EXTCON_USB,
+						EXTCON_PROP_USB_SS, val);
+		}
+		extcon_set_state_sync(info->edev, EXTCON_USB, state);
+	}
 }
 
 static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
@@ -79,21 +105,48 @@ static int qcom_usb_extcon_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = extcon_set_property_capability(info->edev,
+			EXTCON_USB, EXTCON_PROP_USB_SS);
+	ret |= extcon_set_property_capability(info->edev,
+			EXTCON_USB_HOST, EXTCON_PROP_USB_SS);
+	if (ret) {
+		dev_err(dev, "failed to register extcon props rc=%d\n",
+						ret);
+		return ret;
+	}
+
 	info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
 	INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
 
-	info->irq = platform_get_irq_byname(pdev, "usb_id");
-	if (info->irq < 0)
-		return info->irq;
+	info->id_irq = platform_get_irq_byname(pdev, "usb_id");
+	if (info->id_irq > 0) {
+		ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
+					qcom_usb_irq_handler,
+					IRQF_TRIGGER_RISING |
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					pdev->name, info);
+		if (ret < 0) {
+			dev_err(dev, "failed to request handler for ID IRQ\n");
+			return ret;
+		}
+	}
 
-	ret = devm_request_threaded_irq(dev, info->irq, NULL,
+	info->vbus_irq = platform_get_irq_byname(pdev, "usb_vbus");
+	if (info->vbus_irq > 0) {
+		ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
 					qcom_usb_irq_handler,
 					IRQF_TRIGGER_RISING |
 					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 					pdev->name, info);
-	if (ret < 0) {
-		dev_err(dev, "failed to request handler for ID IRQ\n");
-		return ret;
+		if (ret < 0) {
+			dev_err(dev, "failed to request handler for VBUS IRQ\n");
+			return ret;
+		}
+	}
+
+	if (info->id_irq < 0 && info->vbus_irq < 0) {
+		dev_err(dev, "ID and VBUS IRQ not found\n");
+		return -EINVAL;
 	}
 
 	platform_set_drvdata(pdev, info);
@@ -120,8 +173,12 @@ static int qcom_usb_extcon_suspend(struct device *dev)
 	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (device_may_wakeup(dev))
-		ret = enable_irq_wake(info->irq);
+	if (device_may_wakeup(dev)) {
+		if (info->id_irq > 0)
+			ret = enable_irq_wake(info->id_irq);
+		if (info->vbus_irq > 0)
+			ret = enable_irq_wake(info->vbus_irq);
+	}
 
 	return ret;
 }
@@ -131,8 +188,12 @@ static int qcom_usb_extcon_resume(struct device *dev)
 	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (device_may_wakeup(dev))
-		ret = disable_irq_wake(info->irq);
+	if (device_may_wakeup(dev)) {
+		if (info->id_irq > 0)
+			ret = disable_irq_wake(info->id_irq);
+		if (info->vbus_irq > 0)
+			ret = disable_irq_wake(info->vbus_irq);
+	}
 
 	return ret;
 }
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v5 2/3] bindings: pm8941-misc: Add support for VBUS detection

[Rob Herring]

On Mon, 02 Nov 2020 12:34:58 -0800, Guru Das Srinagesh wrote:
> Add interrupt support for reporting VBUS detection status that can be
> detected via a dedicated PMIC pin.
> 
> Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
> Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/extcon/qcom,pm8941-misc.yaml | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>