linux-kernel - Re: [PATCH v2 1/1] device property: Add a note to the fwnode.h

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Message-ID: <Z-5qRcBOK8x__Ry7@smile.fi.intel.com>
Date: Thu, 3 Apr 2025 14:00:21 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Zijun Hu <quic_zijuhu@...cinc.com>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.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>,
	Danilo Krummrich <dakr@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v2 1/1] device property: Add a note to the fwnode.h

On Thu, Apr 03, 2025 at 06:03:57PM +0800, Zijun Hu wrote:
> On 4/1/2025 12:35 AM, Andy Shevchenko wrote:
> > + * Note, this header is not meant to be used by the leaf drivers.
> > + * It provides the low level data types and definitions for the firmware
> > + * and device property providers. The respective API headers should
> > + * guarantee all the required data types and definitions without including
> > + * this header directly into the driver.
> 
> sorry, i don't understand both "leaf drivers" and "respective API
> headers". could you have examples ?

leaf driver is like almost anything under drivers/iio, for example.
The respective API headers is usually: of.h or property.h (the latter
is highly preferred in a new code). TL;DR: the rule of thumb is
do not include this until you know exactly what you are doing.

-- 
With Best Regards,
Andy Shevchenko