linux-kernel - Re: [PATCH v2] software node: Implement device_get_match

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Date: Wed, 24 Apr 2024 16:10:58 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Sui Jingfeng <sui.jingfeng@...ux.dev>, dri-devel@...ts.freedesktop.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.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>
Subject: Re: [PATCH v2] software node: Implement device_get_match_data fwnode
 callback

On Wed, Apr 24, 2024 at 12:37:16AM +0300, Dmitry Baryshkov wrote:
> On Wed, Apr 24, 2024 at 12:49:18AM +0800, Sui Jingfeng wrote:
> > On 2024/4/23 21:28, Andy Shevchenko wrote:
> > > On Tue, Apr 23, 2024 at 12:46:58AM +0800, Sui Jingfeng wrote:

..

> But let me throw an argument why this patch (or something similar) looks
> to be necessary.
> 
> Both on DT and non-DT systems the kernel allows using the non-OF based
> matching. For the platform devices there is platform_device_id-based
> matching.
> 
> Currently handling the data coming from such device_ids requires using
> special bits of code, e.g. platform_get_device_id(pdev)->driver_data to
> get the data from the platform_device_id. Having such codepaths goes
> against the goal of unifying DT and non-DT paths via generic property /
> fwnode code.
> 
> As such, I support Sui's idea of being able to use device_get_match_data
> for non-DT, non-ACPI platform devices.

I'm not sure I buy this. We have a special helpers based on the bus type to
combine device_get_match_data() with the respective ID table crawling, see
the SPI and I²C cases as the examples.

-- 
With Best Regards,
Andy Shevchenko