linux-kernel - [PATCH 1/2] usb typec: tcpci: mt6360: Add vsafe0v support and external vbus supply control

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Date:   Fri, 15 Jan 2021 22:13:20 +0800
From:   cy_huang <u0084500@...il.com>
To:     linux@...ck-us.net, heikki.krogerus@...ux.intel.com,
        matthias.bgg@...il.com, robh+dt@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        cy_huang@...htek.com, gene_chen@...htek.com,
        devicetree@...r.kernel.org
Subject: [PATCH 1/2] usb typec: tcpci: mt6360: Add vsafe0v support and external vbus supply control

From: ChiYuan Huang <cy_huang@...htek.com>

MT6360 not support for TCPC command to control source and sink.
Uses external 5V vbus regulator as the vbus source control.

Also adds the capability to report vsafe0v.

Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
 drivers/usb/typec/tcpm/tcpci_mt6360.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpci_mt6360.c b/drivers/usb/typec/tcpm/tcpci_mt6360.c
index f1bd9e0..0edf4b6 100644
--- a/drivers/usb/typec/tcpm/tcpci_mt6360.c
+++ b/drivers/usb/typec/tcpm/tcpci_mt6360.c
@@ -11,6 +11,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/usb/tcpm.h>
 
 #include "tcpci.h"
@@ -36,6 +37,7 @@ struct mt6360_tcpc_info {
 	struct tcpci_data tdata;
 	struct tcpci *tcpci;
 	struct device *dev;
+	struct regulator *vbus;
 	int irq;
 };
 
@@ -51,6 +53,27 @@ static inline int mt6360_tcpc_write16(struct regmap *regmap,
 	return regmap_raw_write(regmap, reg, &val, sizeof(u16));
 }
 
+static int mt6360_tcpc_set_vbus(struct tcpci *tcpci, struct tcpci_data *data, bool src, bool snk)
+{
+	struct mt6360_tcpc_info *mti = container_of(data, struct mt6360_tcpc_info, tdata);
+	int ret;
+
+	/* To correctly handle the already enabled vbus and disable its supply first */
+	if (regulator_is_enabled(mti->vbus)) {
+		ret = regulator_disable(mti->vbus);
+		if (ret)
+			return ret;
+	}
+
+	if (src) {
+		ret = regulator_enable(mti->vbus);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int mt6360_tcpc_init(struct tcpci *tcpci, struct tcpci_data *tdata)
 {
 	struct regmap *regmap = tdata->regmap;
@@ -138,7 +161,13 @@ static int mt6360_tcpc_probe(struct platform_device *pdev)
 	if (mti->irq < 0)
 		return mti->irq;
 
+	mti->vbus = devm_regulator_get(&pdev->dev, "vbus");
+	if (IS_ERR(mti->vbus))
+		return PTR_ERR(mti->vbus);
+
 	mti->tdata.init = mt6360_tcpc_init;
+	mti->tdata.set_vbus = mt6360_tcpc_set_vbus;
+	mti->tdata.vbus_vsafe0v = 1;
 	mti->tcpci = tcpci_register_port(&pdev->dev, &mti->tdata);
 	if (IS_ERR(mti->tcpci)) {
 		dev_err(&pdev->dev, "Failed to register tcpci port\n");
-- 
2.7.4