On Sat, Aug 16, 2014 at 09:53:50AM +0300, Mika Westerberg wrote: > The recent publication of the ACPI 5.1 specification [1] adds a reserved name > for Device Specific Data (_DSD, Section 6.2.5). This mechanism allows for > passing arbitrary hardware description data to the OS. The exact format of the > _DSD data is specific to the UUID paired with it [2]. > > An ACPI Device Properties UUID has been defined [3] to provide a format > compatible with existing device tree schemas. The purpose for this was to allow > for the reuse of the existing schemas and encourage the development of firmware > agnostic device drivers. > > This series accomplishes the following (as well as some other dependencies): > > * Add _DSD support to the ACPI core > This simply reads the UUID and the accompanying Package > > * Add ACPI Device Properties _DSD format support > This understands the hierarchical key:value pair structure > defined by the Device Properties UUID > > * Add a unified device properties API with ACPI and OF backends > This provides for the firmware agnostic device properties > Interface to be used by drivers > > * Provides 2 example drivers that were previously Device Tree aware that > can now be used with either Device Tree or ACPI Device Properties. The > both drivers use an arbitrary _HID. > > This has been tested on Minnowboard with relevant parts of the modified > DSDT at the end of this email. > > This series does not provide for a means to append to a system DSDT. That > will ultimately be required to make the most effective use of the _DSD > mechanism. Work is underway on that as a separate effort. > > [1] http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf > [2] http://www.uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel.htm > [3] http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf For some reason this series never reached the mailing lists intented, so I re-sent the series with shorter CC list to LKML, linux-acpi and devicetree lists. LKML thread is here: https://lkml.org/lkml/2014/8/17/10 Sorry for the inconvenience. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
