lkml.org 
[lkml]   [2012]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/3] Centralized parsing of ACPI device resources (was: Re: [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C)
Date
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.


\
 
 \ /
  Last update: 2012-11-12 14:01    [W:0.154 / U:0.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site