linux-kernel - Re: [PATCH v1 00/13] intel-lpss: support non-ACPI platforms

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Date:	Tue, 24 Nov 2015 21:00:45 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Kevin Fenzi <kevin@...ye.com>, Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH v1 00/13] intel-lpss: support non-ACPI platforms

On Tuesday 24 November 2015 12:22:46 Andy Shevchenko wrote:
> This series includes few logical sets that bring a support of non-ACPI
> platforms for Intel Skylake.
> 
> First part is a refactoring of built-in device properties support:
>  - keep single value inside the structure
>  - provide helper macros to define built-in properties
>  - fall back to secondary fwnode if primary has no asked property
> 
> Second one is modifications to MFD code and intel-lpss.c driver in particular
> to define and pass built-in properties to the individual drivers.
> 
> Last part is a fix for I2C bug found on Lenovo Yoga hardware and a first
> converted user.
> 
> Built-in device properties is an alternative to platform data. It provides a
> unified API that drivers can use to cover all cases at once: DT, ACPI, and
> built-in properties.
> 
> With this series applied platform data can be considered obsolete. Moreover,
> built-in device properties allows to adjust existing configuration, for
> example, in cases when ACPI values are wrong on some platforms.
> 
> The series has been tested on available hardware and doesn't break current
> behaviour. But we ask you, Kevin, to apply the series on your side and check
> with Lenovo hardware.

I agree with Rafael, this looks really nice. I found one small thing that
could be improved, see the comment on patch 11.

Aside from that, I think we should have a nicer way to pass a property
list through platform_device_info when calling
platform_device_register_full(). You don't do that here because the drivers
you change are based on MFD cells rather than direct platform devices,
but it would fit in the series and should be easy enough to do.

I don't know why Rafael didn't do that for the initial series already, maybe
he had a good reason.

	Arnd
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