On Wed, Sep 20, 2017 at 02:17:38PM +0530, Mayuresh Chitale wrote:
> Hi,
>
> I am working on adding APCI support to optee kernel driver and was
> considering implementing it in the following way:
>
> - An optee device node would be added to the bios as follows:
> Device(OPTE) {
> Name(_HID, ...)
> Name(_CID, ...)
> Name(_DDN, ...)
> Name (_DSD, Package () {
> Package () {
> Package (2) {"method", "smc"}
> }
This _DSD is malformed as it is missing UUID.
> })
> }
>
> - The optee kernel driver would then search for \\SB.OPTE device using
> acpi_get_handle and parse the node to get the conduit method.
You can use the standard device_property_* (see
include/linux/property.h) accessors which fully support _DSD device
properties.
> I was wondering if this is the correct way to implement it and if so
> do I need to get the OPTE device registered? Your feedback is really
> appreciated.
There is something documented here:
Documentation/acpi/DSD-properties-rules.txt
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