linux-kernel - RE: [PATCH v9 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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Message-ID: <874l3wn5ep.fsf@linux.intel.com>
Date:   Mon, 08 Jul 2019 14:15:42 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Pawel Laszczak <pawell@...ence.com>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede\@redhat.com" <hdegoede@...hat.com>,
        "heikki.krogerus\@linux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "robh+dt\@kernel.org" <robh+dt@...nel.org>,
        "rogerq\@ti.com" <rogerq@...com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel\@ti.com" <jbergsagel@...com>,
        "nsekhar\@ti.com" <nsekhar@...com>, "nm\@ti.com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen\@nxp.com" <peter.chen@....com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v9 5/6] usb:cdns3 Add Cadence USB3 DRD Driver


Hi,

Pawel Laszczak <pawell@...ence.com> writes:
> Please look at the changes in drivers/usb/common/common.c file. 
> I'm going to add it as next patch to next version.
>  
>
>>Pawel Laszczak <pawell@...ence.com> writes:
>>>>> +void cdns3_role_stop(struct cdns3 *cdns)
>>
>>>>> +static const char *const cdns3_mode[] = {
>>>>> +	[USB_DR_MODE_UNKNOWN]		= "unknown",
>>>>> +	[USB_DR_MODE_OTG]		= "otg",
>>>>> +	[USB_DR_MODE_HOST]		= "host",
>>>>> +	[USB_DR_MODE_PERIPHERAL]	= "device",
>>>>> +};
>>>>
>>>>don't we have a generic version of this under usb/common ?
>>>>
>>> Yes, there is a similar array, but it is defined also as static
>>> and there is no function for converting value to string.
>>> There is only function for converting string to value.
>>
>>right. You can add the missing interface generically instead of
>>duplicating the enumeration.
>>
>>> There is also:
>>> [USB_DR_MODE_UNKNOWN]		= "",
>>> Instead of:
>>> [USB_DR_MODE_UNKNOWN]		= "unknown",
>>>
>>> So, for USB_DR_MODE_UNKNOWN user will not see anything information.
>>
>>But that's what "unknown" means :-) We don't know the information.
>>
>
> ////// start
> commit 607754c60fabc43408f4f2de82d3560c72870787 (HEAD)
> Author: Pawel Laszczak <pawell@...ence.com>
> Date:   Mon Jul 8 12:53:47 2019 +0200
>
>     usb:common  Added usb_get_dr_mode_from_string and usb_dr_mode_to_string.

This would read better as:

      usb: common: Add usb_get_dr_mode_from_string and usb_dr_mode_to_string.

>
>     Patch introduces new function usb_dr_mode_to_string for converting dual role
>     mod to string and removes static from usb_dr_mode_to_string definition.
>
>     Both changes have made to avoid duplication of code by cdns3 driver.
>
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index 18f5dcf58b0d..ab59954deff8 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -118,13 +118,20 @@ static const char *const usb_dr_modes[] = {
>         [USB_DR_MODE_OTG]               = "otg",
>  };
>
> -static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
> +/**
> + * usb_get_dr_mode_from_string - Convert string to dual role mode.
> + * @str: Pointer to the given string
> + *
> + * The function gets string and returns the correspondig enum usb_dr_mode.
> + */
> +enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
>  {
>         int ret;
>
>         ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
>         return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
>  }
> +EXPORT_SYMBOL_GPL(usb_get_dr_mode_from_string);
>
>  enum usb_dr_mode usb_get_dr_mode(struct device *dev)
>  {
> @@ -139,6 +146,21 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(usb_get_dr_mode);
>
> +/**
> + * usb_dr_mode_to_string - Convert dual role mode to stringi.

s/stringi/string

> + * @dr_mode: Pointer to the given dual role mode
> + *
> + * The function gets enum usb_dr_mode, and returns the correspondig string.
> + */
> +const *char usb_dr_mode_to_string(const enum usb_dr_mode dr_mode)
> +{
> +       if (dr_mode > USB_DR_MODE_UNKNOWN || dr_mode <= USB_DR_MODE_PERIPHERAL)
> +               return usb_dr_modes[dr_mode];
> +
> +       return usb_dr_modes[USB_DR_MODE_UNKNOWN];
> +}
> +EXPORT_SYMBOL_GPL(usb_dr_mode_to_string);

missing prototype in a header file.

-- 
balbi

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