linux-kernel - Re: [PATCH v3 10/12] hikey960: Support usb functionality of Hikey960

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Date:   Sat, 2 Mar 2019 18:01:29 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Yu Chen <chenyu56@...wei.com>
Cc:     USB <linux-usb@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Suzhuangluan <suzhuangluan@...ilicon.com>,
        Kongfei <kongfei@...ilicon.com>, liuyu712@...ilicon.com,
        wanghu17@...ilicon.com, butao@...ilicon.com,
        Yao Chen <chenyao11@...wei.com>, fangshengzhou@...ilicon.com,
        lipengcheng8@...wei.com, songxiaowei <songxiaowei@...ilicon.com>,
        xu yiping <xuyiping@...ilicon.com>, xuyoujun4@...wei.com,
        yudongbin@...ilicon.com, zangleigang@...ilicon.com,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH v3 10/12] hikey960: Support usb functionality of Hikey960

On Sat, Mar 2, 2019 at 11:05 AM Yu Chen <chenyu56@...wei.com> wrote:
>
> This driver handles usb hub power on and typeC port event of HiKey960 board:
> 1)DP&DM switching between usb hub and typeC port base on typeC port
> state
> 2)Control power of usb hub on Hikey960
> 3)Control vbus of typeC port

> +config HISI_HIKEY_USB
> +       tristate "USB functionality of HiSilicon Hikey Platform"
> +       depends on OF && GPIOLIB
> +       help
> +         If you say yes here you get support for usb functionality of HiSilicon Hikey Platform.

> +#include <linux/of.h>

It's hard to see why this have
depends on OF followed by above header inclusion.

> +       hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
> +                       GPIOD_OUT_LOW);

> +       if (!hisi_hikey_usb->typec_vbus)
> +               return -ENOENT;

Hmm... Is it possible to get NULL pointer from gpiod_get() at all?

> +       if (!hisi_hikey_usb->otg_switch)
> +               return -ENOENT;

Ditto.

> +       /* hub-vdd33-en is optional */
> +       hisi_hikey_usb->hub_vbus = devm_gpiod_get(dev, "hub-vdd33-en",
> +                       GPIOD_OUT_HIGH);

devm_gpio_get_optional() if it's indeed optional.

> +       hisi_hikey_usb->role_sw = usb_role_switch_get(dev);
> +       if (!hisi_hikey_usb->role_sw)
> +               return -EPROBE_DEFER;

> +       else if (IS_ERR(hisi_hikey_usb->role_sw))

Redundant 'else'

> +               return PTR_ERR(hisi_hikey_usb->role_sw);

> +static const struct of_device_id id_table_hisi_hikey_usb[] = {
> +       {.compatible = "hisilicon,gpio_hubv1"},
> +       {.compatible = "hisilicon,hikey960_usb"},
> +       {}
> +};

MODULE_DEVICE_TABLE()?

-- 
With Best Regards,
Andy Shevchenko