linux-kernel - Re: [PATCH v4 08/13] usb: typec: tcpci_mt6370: Add Mediatek MT6370 tcpci driver

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Date:   Mon, 4 Jul 2022 22:19:55 +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 v4 08/13] usb: typec: tcpci_mt6370: Add Mediatek MT6370
 tcpci driver

On Mon, Jul 4, 2022 at 7:42 AM ChiaEn Wu <peterwu.pub@...il.com> wrote:
>
> Add chip level mt6370 tcpci driver.

...

> +static const struct reg_sequence mt6370_reg_init[] = {
> +       REG_SEQ(0xA0, 0x1, 1000),
> +       REG_SEQ(0x81, 0x38, 0),
> +       REG_SEQ(0x82, 0x82, 0),
> +       REG_SEQ(0xBA, 0xFC, 0),
> +       REG_SEQ(0xBB, 0x50, 0),
> +       REG_SEQ(0x9E, 0x8F, 0),
> +       REG_SEQ(0xA1, 0x5, 0),
> +       REG_SEQ(0xA2, 0x4, 0),
> +       REG_SEQ(0xA3, 0x4A, 0),
> +       REG_SEQ(0xA4, 0x01, 0),
> +       REG_SEQ(0x95, 0x01, 0),
> +       REG_SEQ(0x80, 0x71, 0),
> +       REG_SEQ(0x9B, 0x3A, 1000)

Keep a comma here in case something would be added later on.

> +};

...

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

'else' is redundant in both cases.

...

> +static int mt6370_check_vendor_info(struct mt6370_priv *priv)
> +{
> +       struct regmap *regmap = priv->tcpci_data.regmap;
> +       u16 vid;
> +       int ret;
> +
> +       ret = regmap_raw_read(regmap, TCPC_VENDOR_ID, &vid, sizeof(u16));
> +       if (ret)
> +               return ret;
> +
> +       if (vid != MT6370_VENDOR_ID) {
> +               dev_err(priv->dev, "Vendor ID not correct 0x%02x\n", vid);
> +               return -ENODEV;

return dev_err_probe(...);

> +       }
> +
> +       return 0;
> +}
> +
> +static int mt6370_tcpc_probe(struct platform_device *pdev)
> +{
> +       struct mt6370_priv *priv;
> +       int ret;
> +
> +       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       priv->dev = &pdev->dev;
> +       platform_set_drvdata(pdev, priv);
> +
> +       priv->tcpci_data.regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +       if (!priv->tcpci_data.regmap)

> +               return dev_err_probe(&pdev->dev, -ENODEV,
> +                                    "Failed to init regmap\n");

You may save some LoCs by introducing a temporary variable

  struct device *dev = &pdev->dev;

and here on a single line

  return dev_err_probe(dev, ...);

Ditto for the rest.

...

> +       ret = mt6370_check_vendor_info(priv);
> +       if (ret)

> +               return dev_err_probe(&pdev->dev, ret,
> +                                    "Failed to check vendor info\n");

This duplicates (with less info given) the message from the callee.

...

> +       { .compatible = "mediatek,mt6370-tcpc", },

Inner comma is not needed.

-- 
With Best Regards,
Andy Shevchenko