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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 2 Apr 2015 12:07:02 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Feng Kan <fkan@....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 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}}),
			}
		})
	}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/