linux-kernel - Re: [PATCH] Fix platform data in leds-pca955x.c

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Message-ID: <fda04867-b470-5266-65db-edb90023f8dc@landley.net>
Date:   Wed, 4 Jul 2018 13:09:34 -0500
From:   Rob Landley <rob@...dley.net>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     clg@...d.org, Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Andrew Jeffery <andrew@...id.au>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix platform data in leds-pca955x.c

On 07/04/2018 12:04 PM, Andy Shevchenko wrote:
> On Wed, Jul 4, 2018 at 8:00 PM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
>> On Wed, Jul 4, 2018 at 3:46 AM, Rob Landley <rob@...dley.net> wrote:
> 
>> For now, you can switch to unified device properties API (basically
>> un-ifdef pca955x_pdata_of_init() and replacing of_* by device_* or
>> fwnode_* compatible calls) and providing a static table of built-in
>> device properties in the platform code in question.
>> (see include/linux/property.h, for example users of
>> PROPERTY_ENTRY_U*() macros, like arch/arm/mach-pxa/raumfeld.c)
> 
> Taking into consideration that device is enumerated by i2c core, which
> is being aware of device properties (1), better example might be
> drivers/platform/x86/intel_cht_int33fe.c

This file doesn't include the word "LED".

  $ grep -i led drivers/platform/x86/intel_cht_int33fe.c
  $

Examining it... this is an ACPI driver, Intel's Not-Invented-Here proprietary
device tree.

So I should convert an sh7760 board to ACPI? How would this fix the problem
where the driver's probe function expects a structure as input that is locally
defined, instead of the generic structure from linux/leds.h it used to accept?

If we feed the probe function NULL platform data _and_ don't have device tree
enabled, doesn't it error out?

Rob