linux-kernel - Re: [PATCH] ACPI: Add Time and Alarm Device (TAD) driver

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Message-ID: <20180319111445.GM2703@lahna.fi.intel.com>
Date:   Mon, 19 Mar 2018 13:14:45 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] ACPI: Add Time and Alarm Device (TAD) driver

On Fri, Mar 16, 2018 at 01:51:01PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Introduce a driver for the ACPI Time and Alarm Device (TAD) based on
> Section 9.18 of ACPI 6.2.
> 
> This driver only supports the system wakeup capabilities of the TAD
> which are mandatory.  Support for the RTC capabilities of the TAD
> will be added to it in the future.
> 
> This driver is entirely sysfs-based.  It provides attributes (under
> the TAD platform device) to allow user space to manage the AC and DC
> wakeup timers of the TAD: set and read their values, set and check
> their expire timer wake policies, check and clear their status and
> check the capabilities of the TAD reported by AML.  The DC timer
> attributes are only present if the TAD supports a separate DC alarm
> timer.
> 
> The wakeup events handling and power management of the TAD is
> expected to be taken care of by the ACPI PM domain attached to its
> platform device.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>