linux-kernel - Re: [PATCH v4] iio : Add cm3218 smbus ara and acpi support

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Date:   Thu, 2 Nov 2017 23:05:02 +0800
From:   Phil Reid <preid@...ctromag.com.au>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Marc CAPDEVILLE <m.capdeville@...log.org>
Cc:     Kevin Tsai <ktsai@...ellamicro.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Wolfram Sang <wsa@...-dreams.de>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] iio : Add cm3218 smbus ara and acpi support

On 2/11/2017 22:49, Srinivas Pandruvada wrote:
> On Thu, 2017-11-02 at 14:35 +0000, Jonathan Cameron wrote:
>> On Fri, 27 Oct 2017 18:27:02 +0200
>> Marc CAPDEVILLE <m.capdeville@...log.org> wrote:
>>
>>>
>>> On asus T100, Capella cm3218 chip is implemented as ambiant light
>>> sensor. This chip expose an smbus ARA protocol device on standard
>>> address 0x0c. The chip is not functional before all alerts are
>>> acknowledged.
>>> On asus T100, this device is enumerated on ACPI bus and the
>>> description give tow I2C connection. The first is the connection to
>>> the ARA device and the second gives the real address of the device.
>>>
>>> So, on device probe,If the i2c address is the ARA address and the
>>> device is enumerated via acpi, we lookup for the real address in
>>> the ACPI resource list and change it in the client structure.
>>> if an interrupt resource is given, and only for cm3218 chip,
>>> we declare an smbus_alert device.
>>>
>>> Signed-off-by: Marc CAPDEVILLE <m.capdeville@...log.org>
>> Wolfram - this needs input from you on how to neatly handle
>> an ACPI registered ARA.
> There was another RFC from Alan cox
> https://patchwork.ozlabs.org/patch/381773/
> 

Wolfram just merged this from me:
[PATCH v11 00/10] Add sbs-manager with smbalert support
https://www.spinics.net/lists/devicetree/msg191947.html

Cleans up the smbus_alert driver a bit.
note: alert_edge_triggered was removed.

And for OF systems core creates the ara device.


-- 
Regards
Phil Reid