linux-kernel - Re: Implementation of fwnode_operations :: device_get_match

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Message-ID: <20230301174309.5nqul7vg5uygwtpy@skbuf>
Date:   Wed, 1 Mar 2023 19:43:09 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Implementation of fwnode_operations :: device_get_match_data()
 for software nodes?

On Wed, Mar 01, 2023 at 07:33:29PM +0200, Andy Shevchenko wrote:
> Yes, that's why I remember overlays approach and FPGA case.
> 
> I guess you have very similar requirements to get this done: your case is a
> particular one for FPGA, i.e. (re-)loading the same HW layout over and over.
> 
> I believe it should be discussed with them being involved. We don't want to
> have two approaches of similar things in the kernel.

I don't think comparisons with the denatured case are helpful.
Is "ax + b = 0" a quadratic equation? Well, yes, if you consider it to
be a particular case where the coefficient of x^2 is 0. Do you use
quadratic equation techniques to solve it? No.

I agree we don't want to have multiple approaches of doing the same thing,
but I debate whether I am really doing the same thing?

If software nodes are not designed to be a good fit for my kind of use
case, then what are they designed for?