linux-kernel - Re: [PATCH] mailbox: add ACPI support for mailbox framework

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Message-ID: <CAL85gmA1mjcX6FEmUHipn0iSzpti2z6D4++7Q3gxGiPGZaE_Cw@mail.gmail.com>
Date:	Thu, 2 Apr 2015 11:04:24 -0700
From:	Feng Kan <fkan@....com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	patches <patches@....com>, Jassi Brar <jassisinghbrar@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] mailbox: add ACPI support for mailbox framework

On Thu, Apr 2, 2015 at 2:07 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> 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@...ux.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}}),
>                         }
>                 })
>         }

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.
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