linux-kernel - Re: [PATCH v3 03/10] software node: allow referencing firmware nodes

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Message-ID: <aQMy00pxp7lrIrvh@smile.fi.intel.com>
Date: Thu, 30 Oct 2025 11:41:39 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	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>,
	Danilo Krummrich <dakr@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Krzysztof Kozlowski <krzk@...nel.org>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 03/10] software node: allow referencing firmware nodes

On Wed, Oct 29, 2025 at 01:28:37PM +0100, Bartosz Golaszewski wrote:
> 
> At the moment software nodes can only reference other software nodes.
> This is a limitation for devices created, for instance, on the auxiliary
> bus with a dynamic software node attached which cannot reference devices
> the firmware node of which is "real" (as an OF node or otherwise).
> 
> Make it possible for a software node to reference all firmware nodes in
> addition to static software nodes. To that end: add a second pointer to
> struct software_node_ref_args of type struct fwnode_handle. The core
> swnode code will first check the swnode pointer and if it's NULL, it
> will assume the fwnode pointer should be set. Rework the helper macros
> and deprecate the existing ones whose names don't indicate the reference
> type.
> 
> Software node graphs remain the same, as in: the remote endpoints still
> have to be software nodes.

...

> -#define SOFTWARE_NODE_REFERENCE(_ref_, ...)			\
> +#define __SOFTWARE_NODE_REF(_ref, _node, ...)			\
>  (const struct software_node_ref_args) {				\
> -	.node = _ref_,						\
> +	._node = _ref,						\
>  	.nargs = COUNT_ARGS(__VA_ARGS__),			\
>  	.args = { __VA_ARGS__ },				\
>  }

Okay, looking at this again I think we don't need a new parameter.
We may check the type of _ref_
(actually why are the macro parameters got renamed here and elsewhere?)
and assign the correct one accordingly. I think this is what _Generic()
is good for.

-- 
With Best Regards,
Andy Shevchenko