Re: [PATCH v2 1/2] usb typec: mt6360: Add support for mt6360 Type-C driver

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Guenter Roeck <linux@xxxxxxxxxxxx> 於 2020年8月27日 週四 下午9:46寫道:
>
> On 8/27/20 4:32 AM, 啟原黃 wrote:
> > Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> 於 2020年8月27日 週四 下午4:05寫道:
> >>
> >> On Thu, 2020-08-27 at 12:50 +0800, cy_huang wrote:
> >>> From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> >>>
> >>> 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 <cy_huang@xxxxxxxxxxx>
> >>> ---
> >>>  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?
> > Okay, I will rename it to mt636x. From our SubPMIC generation,
> > currently, naming will be 6360/62/67, etc..
>
> What if 6361 or 6365 or 6369 will require a different driver ?
> What if 6371 will, in the future, be supported by the same driver ?
> Or, for that matter, 7360 ? 6537 ?
>
> We usually try to avoid "x" in driver names because it can never be
> guaranteed that it will apply to x={0..9}. The current file name is
> just fine; it is customary to name drivers after the first chip they
> support.
>
> Guenter

Thanks. it means the current file name and description is okay....
I'll start to revert the rename work.
>
> >>From our SOC roadmap, one generation can be used for one to two more years.
> > I think the name MT636x is enough.
> > For the next one, I can submit the patch to make it compatible with this driver.
> > Thanks for you comment.
> >>
> >>>  3 files changed, 222 insertions(+)
> >>>  create mode 100644 drivers/usb/typec/tcpm/tcpci_mt6360.c
> >>>
> >>> diff --git a/drivers/usb/typec/tcpm/Kconfig b/drivers/usb/typec/tcpm/Kconfig
> >>> index fa3f393..58a64e1 100644
> >>> --- a/drivers/usb/typec/tcpm/Kconfig
> >>> +++ b/drivers/usb/typec/tcpm/Kconfig
> >>> @@ -27,6 +27,14 @@ config TYPEC_RT1711H
> >>>         Type-C Port Controller Manager to provide USB PD and USB
> >>>         Type-C functionalities.
> >>>
> >>> +config TYPEC_MT6360
> >>> +     tristate "Mediatek MT6360 Type-C driver"
> >>> +     depends on MFD_MT6360
> >>> +     help
> >>> +       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.
> >>> +
> >>>  endif # TYPEC_TCPCI
> >>>
> >>>  config TYPEC_FUSB302
> >>> diff --git a/drivers/usb/typec/tcpm/Makefile b/drivers/usb/typec/tcpm/Makefile
> >>> index a5ff6c8..7592ccb 100644
> >>> --- a/drivers/usb/typec/tcpm/Makefile
> >>> +++ b/drivers/usb/typec/tcpm/Makefile
> >>> @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_WCOVE)     += typec_wcove.o
> >>>  typec_wcove-y                        := wcove.o
> >>>  obj-$(CONFIG_TYPEC_TCPCI)    += tcpci.o
> >>>  obj-$(CONFIG_TYPEC_RT1711H)  += tcpci_rt1711h.o
> >>> +obj-$(CONFIG_TYPEC_MT6360)   += tcpci_mt6360.o
> >>> diff --git a/drivers/usb/typec/tcpm/tcpci_mt6360.c b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> >>> new file mode 100644
> >>> index 00000000..a381b5d
> >>> --- /dev/null
> >>> +++ b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> >>> @@ -0,0 +1,213 @@
> >>> +// SPDX-License-Identifier: GPL-2.0-only
> >>> +//
> >>> +// Copyright (C) 2020 MediaTek Inc.
> >>> +//
> >>> +// Author: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> >> Use /* */ except SPDX?
> > Yes, sure.
> >>
> >>> +
> >>> +#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
> > I'll remove it in the next revision. Thanks
> >>
> >>> +             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?
> > Remove it later. you're right.
> >>
> >>> +     }
> >>> +
> >>> +     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?
> > Yes, sync must be considered to wait interrupt is really finished.
> > And disable_irq already the sync version.
> >>
> >>> +     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 <cy_huang@xxxxxxxxxxx>");
> >>> +MODULE_DESCRIPTION("MT6360 USB Type-C Port Controller Interface Driver");
> >>> +MODULE_LICENSE("GPL v2");
> >>
>




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