linux-kernel - Re: [PATCH v3 08/14] usb: typec: tcpci_mt6370: Add Mediatek MT6370 tcpci driver

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Message-ID: <CAHp75Vchspgg_VaM+7JHD+2x+-JPkJXSdtLoqQGAx=kg5uAdSg@mail.gmail.com>
Date:   Thu, 23 Jun 2022 20:07:17 +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@...htek.com,
        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 v3 08/14] usb: typec: tcpci_mt6370: Add Mediatek MT6370
 tcpci driver

On Thu, Jun 23, 2022 at 2:00 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:
>
> From: ChiYuan Huang <cy_huang@...htek.com>
>
> Add chip level mt6370 tcpci driver.

...

> +config TYPEC_TCPCI_MT6370
> +       tristate "Mediatek MT6370 Type-C driver"
> +       depends on MFD_MT6370
> +       help
> +         Mediatek MT6370 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.

What will be the module name?

...

> +#include <linux/bits.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>

> +#include <linux/of.h>

No user of this header is found in this file.

> +#include <linux/platform_device.h>
> +#include <linux/pm_wakeup.h>
> +#include <linux/pm_wakeirq.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/usb/tcpm.h>
> +#include "tcpci.h"

...

> +       if (did == MT6370_TCPC_DID_A) {
> +               ret = regmap_write(data->regmap, TCPC_FAULT_CTRL, 0x80);
> +               if (ret)
> +                       return ret;

return regmap_write(...);

> +       }
> +
> +       return 0;

...

> +       if (ret && !source)
> +               ret = regulator_disable(priv->vbus);
> +       else if (!ret && source)
> +               ret = regulator_enable(priv->vbus);
> +       else
> +               ret = 0;
> +
> +       return ret;

Can it be

  if (ret && ...)
    return regulator_disable(...);
  if (!ret && ...)
    return regulator_enable(...);

  return 0;

?

...

> +       if (!priv->tcpci_data.regmap) {
> +               dev_err(&pdev->dev, "Failed to init regmap\n");
> +               return -ENODEV;
> +       }

return dev_err_probe(...); ?

...

> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to check vendor info (%d)\n", ret);
> +               return ret;
> +       }

Ditto.

...

> +       priv->irq = platform_get_irq(pdev, 0);
> +       if (priv->irq < 0) {

> +               dev_err(&pdev->dev, "Failed to get TCPC irq (%d)\n", priv->irq);

The message like this is printed in case of error inside
platform_get_irq(), no need to duplicate.

> +               return priv->irq;
> +       }

...

> +       priv->tcpci = tcpci_register_port(&pdev->dev, &priv->tcpci_data);
> +       if (IS_ERR(priv->tcpci)) {
> +               dev_err(&pdev->dev, "Failed to register tcpci port\n");
> +               return PTR_ERR(priv->tcpci);

return dev_err_probe(); ?

> +       }

...

> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to allocate irq (%d)\n", ret);
> +               tcpci_unregister_port(priv->tcpci);
> +               return ret;

Ditto.

> +       }

-- 
With Best Regards,
Andy Shevchenko