linux-kernel - Re: [PATCH v1 07/10] spi: pxa2xx: Provide num-cs for Sharp PDAs via device properties

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Date: Tue, 26 Mar 2024 20:26:11 +0000
From: Mark Brown <broonie@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v1 07/10] spi: pxa2xx: Provide num-cs for Sharp PDAs via
 device properties

On Tue, Mar 26, 2024 at 10:12:12PM +0200, Andy Shevchenko wrote:
> On Tue, Mar 26, 2024 at 08:02:57PM +0000, Mark Brown wrote:

> > It is not clear to me that this makes the kernel side better, it just
> > seems to be rewriting the platform data for the sake of it.  If it was
> > converting to DT there'd be some stuff from it being DT but this keeps
> > everything as in kernel as board files, just in a more complex form.

> Not really. The benefits with swnode conversion are the following:

> - reducing custom APIs / data types between _shared_ (in a sense of
>   supporting zillion different platforms) driver and a certain board
>   file

> - as an effect of the above, reducing kernel code base, and as the result
>   make maintenance easier and bug-free for that parts

I'm more worried about the possibility of breaking things with swnode
support than I am for board files - with board files you've got a good
chance of failing to compile if things get messed up, with swnode you
can typo a property or whatever and silently fail.  

> - preparing a driver to be ready for any old board file conversion to DT
>   as it reduces that churn (you won't need to touch the driver code)

The driver appears to already have DT support (there's a compatible for
MMP2 in there)?

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