linux-kernel - Re: [PATCH v2 17/20] extcon: intel-cht-wc: Support devs with Micro-B / USB-2 only Type-C connectors

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Date:   Tue, 16 Nov 2021 13:28:51 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Ard Biesheuvel <ardb@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Yauhen Kharuzhy <jekhor@...il.com>,
        Tsuchiya Yuto <kitakar@...il.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2 17/20] extcon: intel-cht-wc: Support devs with Micro-B
 / USB-2 only Type-C connectors

On Sun, Nov 14, 2021 at 7:04 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> So far the extcon-intel-cht-wc code has only been tested on devices with
> a Type-C connector with USB-PD, USB3 (superspeed) and DP-altmode support
> through a FUSB302 Type-C controller.
>
> Some devices with the intel-cht-wc PMIC however come with an USB-micro-B
> connector, or an USB-2 only Type-C connector without USB-PD.
>
> Which device-model we are running on can be identified with the new
> intel_cht_wc_get_model() helper and on models without a Type-C controller
> the extcon code must control the Vbus 5V boost converter and the USB role
> switch depending on the detected cable-type.

...

>  config EXTCON_INTEL_CHT_WC
>         tristate "Intel Cherrytrail Whiskey Cove PMIC extcon driver"
> -       depends on INTEL_SOC_PMIC_CHTWC

> +       depends on INTEL_SOC_PMIC_CHTWC && USB_SUPPORT

Having these two in one expression sounds a bit alogical to me, can
you just add a separate "depends on"?

> +       select USB_ROLE_SWITCH

...

> +       if (ext->vbus_boost && ext->vbus_boost_enabled != enable) {
> +               if (enable)
> +                       ret = regulator_enable(ext->vbus_boost);
> +               else
> +                       ret = regulator_disable(ext->vbus_boost);

Redundant blank line here (but it's up to you)

> +               if (ret == 0)
> +                       ext->vbus_boost_enabled = enable;
> +               else
> +                       dev_err(ext->dev, "Error updating Vbus boost regulator: %d\n", ret);

Why not a traditional pattern, i.e. error handling first?

> +       }

...

> +/* Some boards require controlling the role-sw and vbus based on the id-pin */

Vbus ? VBUS? Here and there the inconsistency of some terms...

...

> +       ext->vbus_boost = devm_regulator_get_optional(ext->dev, "vbus");
> +       if (IS_ERR(ext->vbus_boost)) {
> +               ret = PTR_ERR(ext->vbus_boost);
> +               if (ret == -ENODEV)
> +                       ret = -EPROBE_DEFER;
> +
> +               return dev_err_probe(ext->dev, ret, "getting vbus regulator");

Can be also written as

    if (PTR_ERR(ext->vbus_boost) == -ENODEV ||
PTR_ERR(ext->vbus_boost) == -EPROBE_DEFER)
        return dev_err_probe(ext->dev, -EPROBE_DEFER, "getting vbus regulator");

    return PTR_ERR(ext->vbus_boost);

but up to you.

> +       }

-- 
With Best Regards,
Andy Shevchenko