linux-kernel - Implementation of fwnode_operations :: device_get_match

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Message-ID: <20230223203713.hcse3mkbq3m6sogb@skbuf>
Date:   Thu, 23 Feb 2023 22:37:13 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        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: Implementation of fwnode_operations :: device_get_match_data() for
 software nodes?

Hi,

I have a need to instantiate a driver written for OF which calls
device_get_match_data(dev) to get various information based on the
compatible string.

I am creating a software node based on the following properties:

	struct property_entry props[2] = {
		PROPERTY_ENTRY_STRING("compatible", compatible),
		{},
	};

(I see I'm not the only one doing this, some drivers/platform/x86/x86-android-tablets.c
and drivers/platform/chrome/chromeos_laptop.c also do it)

and the driver in question does begin to probe, but its match_data is
NULL, because the operation from the title isn't implemented for
software nodes. So probing ultimately fails.

Is there some sort or reason why this doesn't exist, other than a lack
of need?

Can someone please help me with an implementation of this feature?

Thanks,
Vladimir