On Thu, 2020-08-27 at 12:50 +0800, cy_huang wrote:

From: ChiYuan Huang <redacted>

Mediatek MT6360 is a multi-functional IC that includes USB Type-C.
It works with Type-C Port Controller Manager to provide USB PD
and USB Type-C functionalities.

Add fix to Prevent the race condition from interrupt and tcpci port unregister
during module remove.

Signed-off-by: ChiYuan Huang <redacted>
---
 drivers/usb/typec/tcpm/Kconfig        |   8 ++
 drivers/usb/typec/tcpm/Makefile       |   1 +
 drivers/usb/typec/tcpm/tcpci_mt6360.c | 213 ++++++++++++++++++++++++++++++++++

Can you avoid using special SoC name in file name?
It's not clear if you later support new SoC in the driver, e.g. mt63xx?

Use /* */ except SPDX?

+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/usb/tcpm.h>
+
+#include "tcpci.h"
+
+#define MT6360_REG_VCONNCTRL1	0x8C
+#define MT6360_REG_MODECTRL2	0x8F
+#define MT6360_REG_SWRESET	0xA0
+#define MT6360_REG_DEBCTRL1	0xA1
+#define MT6360_REG_DRPCTRL1	0xA2
+#define MT6360_REG_DRPCTRL2	0xA3
+#define MT6360_REG_I2CTORST	0xBF
+#define MT6360_REG_RXCTRL2	0xCF
+#define MT6360_REG_CTDCTRL2	0xEC
+
+/* MT6360_REG_VCONNCTRL1 */
+#define MT6360_VCONNCL_ENABLE	BIT(0)
+/* MT6360_REG_RXCTRL2 */
+#define MT6360_OPEN40M_ENABLE	BIT(7)
+/* MT6360_REG_CTDCTRL2 */
+#define MT6360_RPONESHOT_ENABLE	BIT(6)
+
+struct mt6360_tcpc_info {
+	struct tcpci_data tdata;
+	struct tcpci *tcpci;
+	struct device *dev;
+	int irq;
+};
+
+static inline int mt6360_tcpc_read16(struct regmap *regmap,
+				     unsigned int reg, u16 *val)
+{
+	return regmap_raw_read(regmap, reg, val, sizeof(u16));
+}
+
+static inline int mt6360_tcpc_write16(struct regmap *regmap,
+				      unsigned int reg, u16 val)
+{
+	return regmap_raw_write(regmap, reg, &val, sizeof(u16));
+}
+
+static int mt6360_tcpc_init(struct tcpci *tcpci, struct tcpci_data *tdata)
+{
+	struct regmap *regmap = tdata->regmap;
+	int ret;
+
+	ret = regmap_write(regmap, MT6360_REG_SWRESET, 0x01);
+	if (ret)
+		return ret;
+
+	/* after reset command, wait 1~2ms to wait IC action */
+	usleep_range(1000, 2000);
+
+	/* write all alert to masked */
+	ret = mt6360_tcpc_write16(regmap, TCPC_ALERT_MASK, 0);
+	if (ret)
+		return ret;
+
+	/* config I2C timeout reset enable , and timeout to 200ms */
+	ret = regmap_write(regmap, MT6360_REG_I2CTORST, 0x8F);
+	if (ret)
+		return ret;
+
+	/* config CC Detect Debounce : 26.7*val us */
+	ret = regmap_write(regmap, MT6360_REG_DEBCTRL1, 0x10);
+	if (ret)
+		return ret;
+
+	/* DRP Toggle Cycle : 51.2 + 6.4*val ms */
+	ret = regmap_write(regmap, MT6360_REG_DRPCTRL1, 4);
+	if (ret)
+		return ret;
+
+	/* DRP Duyt Ctrl : dcSRC: /1024 */
+	ret = mt6360_tcpc_write16(regmap, MT6360_REG_DRPCTRL2, 330);
+	if (ret)
+		return ret;
+
+	/* Enable VCONN Current Limit function */
+	ret = regmap_update_bits(regmap, MT6360_REG_VCONNCTRL1, MT6360_VCONNCL_ENABLE,
+				 MT6360_VCONNCL_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Enable cc open 40ms when pmic send vsysuv signal */
+	ret = regmap_update_bits(regmap, MT6360_REG_RXCTRL2, MT6360_OPEN40M_ENABLE,
+				 MT6360_OPEN40M_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Enable Rpdet oneshot detection */
+	ret = regmap_update_bits(regmap, MT6360_REG_CTDCTRL2, MT6360_RPONESHOT_ENABLE,
+				 MT6360_RPONESHOT_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Set shipping mode off, AUTOIDLE on */
+	return regmap_write(regmap, MT6360_REG_MODECTRL2, 0x7A);
+}
+
+static irqreturn_t mt6360_irq(int irq, void *dev_id)
+{
+	struct mt6360_tcpc_info *mti = dev_id;
+
+	return tcpci_irq(mti->tcpci);
+}
+
+static int mt6360_tcpc_probe(struct platform_device *pdev)
+{
+	struct mt6360_tcpc_info *mti;
+	int ret;
+
+	mti = devm_kzalloc(&pdev->dev, sizeof(*mti), GFP_KERNEL);
+	if (!mti)
+		return -ENOMEM;
+
+	mti->dev = &pdev->dev;
+
+	mti->tdata.regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!mti->tdata.regmap) {
+		dev_err(&pdev->dev, "Failed to get parent regmap\n");
+		return -ENODEV;
+	}
+
+	mti->irq = platform_get_irq_byname(pdev, "PD_IRQB");
+	if (mti->irq < 0) {
+		dev_err(&pdev->dev, "Failed to get PD_IRQB irq\n");

No need add error log, platform_get_irq_byname will print it

+		return mti->irq;
+	}
+
+	mti->tdata.init = mt6360_tcpc_init;
+	mti->tcpci = tcpci_register_port(&pdev->dev, &mti->tdata);
+	if (IS_ERR_OR_NULL(mti->tcpci)) {

Use IS_ERR()? it seems not return NULL

+		dev_err(&pdev->dev, "Failed to register tcpci port\n");
+		return PTR_ERR(mti->tcpci);

If return NULL, this may return 0?

+	}
+
+	ret = devm_request_threaded_irq(mti->dev, mti->irq, NULL, mt6360_irq, IRQF_ONESHOT,
+					dev_name(&pdev->dev), mti);
+	if (ret) {
+		dev_err(mti->dev, "Failed to register irq\n");
+		tcpci_unregister_port(mti->tcpci);
+		return ret;
+	}
+
+	device_init_wakeup(&pdev->dev, true);
+	platform_set_drvdata(pdev, mti);
+
+	return 0;
+}
+
+static int mt6360_tcpc_remove(struct platform_device *pdev)
+{
+	struct mt6360_tcpc_info *mti = platform_get_drvdata(pdev);
+
+	disable_irq(mti->irq);

need sync?

+	tcpci_unregister_port(mti->tcpci);
+	return 0;
+}
+
+static int __maybe_unused mt6360_tcpc_suspend(struct device *dev)
+{
+	struct mt6360_tcpc_info *mti = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(mti->irq);
+
+	return 0;
+}
+
+static int __maybe_unused mt6360_tcpc_resume(struct device *dev)
+{
+	struct mt6360_tcpc_info *mti = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(mti->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mt6360_tcpc_pm_ops, mt6360_tcpc_suspend, mt6360_tcpc_resume);
+
+static const struct of_device_id __maybe_unused mt6360_tcpc_of_id[] = {
+	{ .compatible = "mediatek,mt6360-tcpc", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mt6360_tcpc_of_id);
+
+static struct platform_driver mt6360_tcpc_driver = {
+	.driver = {
+		.name = "mt6360-tcpc",
+		.pm = &mt6360_tcpc_pm_ops,
+		.of_match_table = mt6360_tcpc_of_id,
+	},
+	.probe = mt6360_tcpc_probe,
+	.remove = mt6360_tcpc_remove,
+};
+module_platform_driver(mt6360_tcpc_driver);
+
+MODULE_AUTHOR("ChiYuan Huang [off-list ref]");
+MODULE_DESCRIPTION("MT6360 USB Type-C Port Controller Interface Driver");
+MODULE_LICENSE("GPL v2");