On Thu, Apr 02, 2015 at 11:04:24AM -0700, Feng Kan wrote:
> On Thu, Apr 2, 2015 at 2:07 AM, Mika Westerberg
> <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> > 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.westerberg@xxxxxxxxxxxxxxx> 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}}),
> > }
> > })
> > }
>
> Thanks, will try this. A side question on your previous reply. Would you
> prefer a new driver using the PRP0001 or an actual proper HID.
If you have existing DT bindings for this, then PRP0001 is fine.
Otherwise you should use the proper _HID for this particular device.
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