linux-kernel - [PATCH v3 09/19] usb: dwc3: qcom: Override VBUS when using gpio_usb

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Date:   Wed, 22 Jan 2020 18:56:00 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        gregkh@...uxfoundation.org, jackp@...eaurora.org, balbi@...nel.org,
        bjorn.andersson@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v3 09/19] usb: dwc3: qcom: Override VBUS when using gpio_usb_connector

Using the gpio_usb_connector driver also means that we are not supplying
VBUS via the SoC but by an external PMIC directly.

This patch searches for a gpio_usb_connector as a child node of the core
DWC3 block and if found switches on the VBUS over-ride, leaving it up to
the role-switching code in gpio-usb-connector to switch off and on VBUS.

Cc: Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-arm-msm@...r.kernel.org
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 261af9e38ddd..73f9f3bcec59 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -550,6 +550,16 @@ static const struct dwc3_acpi_pdata sdm845_acpi_pdata = {
 	.ss_phy_irq_index = 2
 };
 
+static bool dwc3_qcom_find_gpio_usb_connector(struct platform_device *pdev)
+{
+	struct device_node	*np = pdev->dev.of_node;
+
+	if (of_get_child_by_name(np, "gpio_usb_connector"))
+		return true;
+
+	return false;
+}
+
 static int dwc3_qcom_probe(struct platform_device *pdev)
 {
 	struct device_node	*np = pdev->dev.of_node;
@@ -557,7 +567,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	struct dwc3_qcom	*qcom;
 	struct resource		*res, *parent_res = NULL;
 	int			ret, i;
-	bool			ignore_pipe_clk;
+	bool			ignore_pipe_clk, gpio_usb_conn;
 
 	qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
 	if (!qcom)
@@ -649,9 +659,10 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	}
 
 	qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
+	gpio_usb_conn = dwc3_qcom_find_gpio_usb_connector(qcom->dwc3);
 
-	/* enable vbus override for device mode */
-	if (qcom->mode == USB_DR_MODE_PERIPHERAL)
+	/* enable vbus override for device mode or GPIO USB connector mode */
+	if (qcom->mode == USB_DR_MODE_PERIPHERAL || gpio_usb_conn)
 		dwc3_qcom_vbus_overrride_enable(qcom, true);
 
 	/* register extcon to override sw_vbus on Vbus change later */
-- 
2.25.0