From: Arnd Bergmann <arnd@arndb.de>
To: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Cc: jaswinder.singh@linaro.org, broonie@kernel.org,
lv.zheng@intel.com, linaro-acpi@lists.linaro.org,
patches@linaro.org, linux-acpi@vger.kernel.org,
rjw@rjwysocki.net
Subject: Re: [PATCH v11 1/1] Mailbox: Add support for Platform Communication Channel
Date: Tue, 18 Nov 2014 14:39:06 +0100 [thread overview]
Message-ID: <1946980.r78SuCoQbW@wuerfel> (raw)
In-Reply-To: <1415840378-1973-2-git-send-email-ashwin.chaugule@linaro.org>
On Wednesday 12 November 2014 19:59:38 Ashwin Chaugule wrote:
> ACPI 5.0+ spec defines a generic mode of communication
> between the OS and a platform such as the BMC. This medium
> (PCC) is typically used by CPPC (ACPI CPU Performance management),
> RAS (ACPI reliability protocol) and MPST (ACPI Memory power
> states).
>
> This patch adds PCC support as a Mailbox Controller. As of
> ACPI v5.1 there is no provision for clients to lookup mailbox
> controllers in a way that Linux expects. e.g. in DT the clients
> can list the mailboxes they can associate with in the DT binding
> and then provide a unique index to lookup a channel within a mailbox.
> Since the ACPI spec doesn't have anything similar, we introduce a
> mailbox controller specific API so that when the client calls it,
> we know to lookup in the context of a specific controller. This
> also helps in keeping a consistent interface across DT and ACPI
> for such drivers.
>
> This patch implements basic PCC support using the ACPI v5.1
> structures. IRQ mode support will be provided as follow up patches.
>
> Reviewed-by: Mark Brown <broonie@kernel.org>
> Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
next prev parent reply other threads:[~2014-11-18 13:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-13 0:59 [PATCH v11 0/1] PCC: Platform Communication Channel Ashwin Chaugule
2014-11-13 0:59 ` [PATCH v11 1/1] Mailbox: Add support for " Ashwin Chaugule
2014-11-18 13:39 ` Arnd Bergmann [this message]
2014-11-18 14:21 ` Ashwin Chaugule
2014-11-27 7:33 ` Jassi Brar
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