linux-kernel - Re: [PATCH] software node: fix wrong node passed to find nargs

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Message-ID: <800d89c5-c9e3-d969-ea9a-08ec0362a90c@gmail.com>
Date:   Tue, 21 Dec 2021 22:09:45 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] software node: fix wrong node passed to find nargs_prop

Hi Sakari

On 21/12/2021 09:45, Sakari Ailus wrote:
> Hi Greg, Andy,
> 
> On Tue, Dec 21, 2021 at 10:34:11AM +0100, Greg Kroah-Hartman wrote:
>> On Mon, Dec 20, 2021 at 11:37:07PM +0000, Daniel Scally wrote:
>>> Thanks Andy
>>>
>>> On 20/12/2021 22:13, Andy Shevchenko wrote:
>>>> + Sakari, Dan
>>>>
>>>> On Monday, December 20, 2021, Clément Léger <clement.leger@...tlin.com
>>>> <mailto:clement.leger@...tlin.com>> wrote:
>>>>
>>>>     nargs_prop refers to a property located in the reference that is found
>>>>     within the nargs property.
>>>
>>> I think this is right (it's not used in the ACPI version, and the OF
>>> version is quite convoluted so a bit hard to follow)...but also I note
>>> that none of the users of fwnode_property_get_reference_args() pass
>>> anything to nargs_prop anyway...do we even need this?
>>
>> Looks like it is unused, please just remove it.
> 
> If you remove nargs_prop argument, then callers will have to use OF
> property API instead to parse references with property-defined number of
> arguments. The goal has been to cover all functionality in a
> firmware-independent way.

My mistake, I missed that of_parse_phandle_with_args() has a ton of
direct users. I guess we should try to replace those with
fwnode_property_get_reference_args() where appropriate.