On Wed, Apr 01, 2015 at 10:01:45AM -0700, Feng Kan wrote:
> On Wed, Apr 1, 2015 at 12:45 AM, Mika Westerberg
> <mika.westerb...@linux.intel.com> wrote:
> > On Tue, Mar 31, 2015 at 02:18:00PM -0700, Feng Kan wrote:
> >> This will add support for ACPI parsing of the mboxes attribute
> >> when booting with ACPI table. The client will have a attribute
> >> mimic the dts call "mboxes". In the ACPI case, the client will
> >> mark "mboxes" with the ACPI HID of the mbox it wishes to use.
> >>
> >> Name (_DSD, Package () {
> >> ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> >> Package () {
> >> Package (2) {"mboxes", "ACPIHID"},
> >> }
> >> })
> >
> > Instead of this, why not match against the DT compatible property?
> >
> > Name (_HID, "PRP0001")
> >
> > Name (_DSD, Package () {
> > ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> > Package () {
> > Package (2) {"compatible",
> > "your-dt-compatible-string"},
> > }
> > })
> I think my description was not clear enough. The _DSD section is not
> meant to identify the mailbox driver, but used by the acpi node that will
> request the mailbox channel. The dts version would be as below.
>
> mailbox: {
> }
>
> user-mbox: {
> mboxes: <&mailbox 0>
> }
>
> The mboxes attribute in the user of the mbox has to specify the HID of the
> mbox in order to retrieve channel pointer.
Okay, then I think you can use reference instead of _HID, like
// The mailbox device
Device (MLBX) {
}
// User-mbox device
Device (USBX) {
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"mboxes", Package () {^^MLBX, 0}}),
}
})
}
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