linux-kernel - Re: [PATCH v5 08/13] usb: typec: tcpci_mt6370: Add MediaTek MT6370 tcpci driver

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Date:   Fri, 15 Jul 2022 15:10:42 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     ChiaEn Wu <peterwu.pub@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Helge Deller <deller@....de>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        Alice Chen <alice_chen@...htek.com>,
        cy_huang <cy_huang@...htek.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
        szuni chen <szunichen@...il.com>
Subject: Re: [PATCH v5 08/13] usb: typec: tcpci_mt6370: Add MediaTek MT6370
 tcpci driver

On Fri, Jul 15, 2022 at 1:28 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:

> The MT6370 is a highly-integrated smart power management IC, which
> includes a single cell Li-Ion/Li-Polymer switching battery charger,
> a USB Type-C & Power Delivery (PD) controller, dual Flash LED current
> sources, a RGB LED driver, a backlight WLED driver, a display bias
> driver and a general LDO for portable devices.
>
> This commit add support for the Type-C & Power Delivery controller in

This commit add -> Add


> MediaTek MT6370 IC.


> +static int mt6370_tcpc_probe(struct platform_device *pdev)
> +{
> +       struct mt6370_priv *priv;
> +       struct device *dev = &pdev->dev;
> +       int ret;
> +
> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       priv->dev = dev;
> +       platform_set_drvdata(pdev, priv);
> +
> +       priv->tcpci_data.regmap = dev_get_regmap(dev->parent, NULL);
> +       if (!priv->tcpci_data.regmap)
> +               return dev_err_probe(dev, -ENODEV, "Failed to init regmap\n");
> +
> +       ret = mt6370_check_vendor_info(priv);
> +       if (ret)
> +               return ret;
> +
> +       priv->irq = platform_get_irq(pdev, 0);
> +       if (priv->irq < 0)
> +               return priv->irq;
> +
> +       /* Assign TCPCI feature and ops */
> +       priv->tcpci_data.auto_discharge_disconnect = 1;
> +       priv->tcpci_data.init = mt6370_tcpc_init;
> +       priv->tcpci_data.set_vconn = mt6370_tcpc_set_vconn;
> +
> +       priv->vbus = devm_regulator_get_optional(dev, "vbus");
> +       if (!IS_ERR(priv->vbus))
> +               priv->tcpci_data.set_vbus = mt6370_tcpc_set_vbus;
> +
> +       priv->tcpci = tcpci_register_port(dev, &priv->tcpci_data);
> +       if (IS_ERR(priv->tcpci))
> +               return dev_err_probe(dev, PTR_ERR(priv->tcpci),
> +                                    "Failed to register tcpci port\n");
> +
> +       ret = devm_request_threaded_irq(dev, priv->irq, NULL,
> +                                       mt6370_irq_handler, IRQF_ONESHOT,
> +                                       dev_name(dev), priv);
> +       if (ret) {

> +               tcpci_unregister_port(priv->tcpci);

This is wrong.
You mixed devm_ with non-devm. Either drop devm_ *after* the first
non-devm_ call, or convert everything to be managed.

> +               return dev_err_probe(dev, ret, "Failed to allocate irq\n");
> +       }
> +
> +       device_init_wakeup(dev, true);
> +       dev_pm_set_wake_irq(dev, priv->irq);
> +
> +       return 0;
> +}
> +
> +static int mt6370_tcpc_remove(struct platform_device *pdev)
> +{
> +       struct mt6370_priv *priv = platform_get_drvdata(pdev);

> +       disable_irq(priv->irq);

Why?
An ugly workaround due to ordering issues in ->probe()?

> +       tcpci_unregister_port(priv->tcpci);
> +       dev_pm_clear_wake_irq(&pdev->dev);
> +       device_init_wakeup(&pdev->dev, false);
> +
> +       return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko