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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:// linux-next
> Specifically patches from this thread:
> 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.


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

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