linux-kernel - [PATCH 0/3] Centralized parsing of ACPI device resources (was: Re: [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C)

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Date:	Mon, 12 Nov 2012 12:51:32 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	mathias.nyman@...ux.intel.com, linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, broonie@...nsource.wolfsonmicro.com,
	grant.likely@...retlab.ca, linus.walleij@...aro.org,
	khali@...ux-fr.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 0/3] Centralized parsing of ACPI device resources (was: Re: [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C)

On Saturday, November 03, 2012 09:46:30 AM Mika Westerberg wrote:
> Hi,
> 
> With ACPI 5 we can now describe how devices are connected to their bus
> using new resources: SPISerialBus and I2CSerialBus. Also it is now possible
> to add GPIO connections for the devices with the help of GpioIO and GpioInt
> resources.
> 
> This series adds support for these new resources.
> 
> The series based on the ACPI 5 enumeration support patches that are available
> on Rafael's linux-next branch:
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next	
> 
> Specifically patches from this thread:
> 
> 	https://lkml.org/lkml/2012/10/31/154
> 
> Since these patches depend on the above patches on Rafael's linux-next branch
> I suggest that these be merged via that branch, if there are no objections.
> 
> The series follows the Device Tree way so that it would be easy to add ACPI
> support for the existing SPI and I2C drivers if one is familiar how the
> corresponding DT support is done.
> 
> For GPIO we introduce a function that maps between ACPI GPIO numbers and Linux
> ones - acpi_get_gpio().
> 
> SPI slave devices gets enumerated automatically if the master device has
> master->dev.acpi_handle set (this is analogous to master->dev.of_mode). The
> platform bus code in Rafael's branch assigns the ACPI handle to the master
> device.
> 
> I2C slave devices can be enumerated by calling acpi_i2c_register_devices() in
> the adapter driver.

Following the previous discussion, the patches below move some ACPI resources
parsing code from drivers/pnp/pnpacpi/rsparser.c to a new file
drivers/acpi/resource.c and reformat it so that it can be used by other
subsystems (patch [1/3]), convert the new ACPI platform devices creation
code to use the routines in drivers/acpi/resource.c instead of doing its
own resource parsing (patch [2/3]) and make the ACPI namespace scan attach
a list of _CRS resources to each struct acpi_device it creates, where
applicable (patch [3/3] - the ACPI platform device code is converted to use
that instead of executing _CRS by itself via acpi_walk_resources()).

The patchset is on top of the current linux-pm.git/linux-next branch and
has been tested somewhat.  Please let me know if you find any problems in it.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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