linux-kernel - Re: Please suggest proper format for DT properties.

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Date:	Mon, 21 Sep 2015 19:32:10 -0500
From:	Rob Herring <robh@...nel.org>
To:	Constantine Shulyupin <const@...elinux.com>
Cc:	open list <linux-kernel@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>, lm-sensors@...sensors.org,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: Please suggest proper format for DT properties.

On Mon, Sep 21, 2015 at 2:24 PM, Constantine Shulyupin
<const@...elinux.com> wrote:
> On Mon, Sep 21, 2015 at 4:51 AM, Rob Herring <robh@...nel.org> wrote:
>> On Fri, Sep 18, 2015 at 5:36 PM, Constantine Shulyupin
>> <const@...elinux.com> wrote:
>>> Hi,
>>>
>>> I am designing DT support for a hwmon chip.
>>> It has some sensors, each of them can be:
>>>  - "disabled"
>>>  - "thermal diode"
>>>  - "thermistor"
>>>  - "voltage"
>>>
>>> Four possible options for DT properties format.
>>>
>>> Option 1: Separated property for each sensor.
>>>
>>> Example nct7802 node:
>>>
>>> nct7802 {
>>>         compatible = "nuvoton,nct7802";
>>>         reg = <0x2a>;
>>>         nuvoton,sensor1-type = "thermistor";
>>>         nuvoton,sensor2-type = "disabled";
>>>         nuvoton,sensor3-type = "voltage";
>>> };
>>>
>>> Option 2: Array of strings for all sensors.
>>>
>>> nct7802 {
>>>         compatible = "nuvoton,nct7802";
>>>         reg = <0x2a>;
>>>         nuvoton,sensors-types = "thermistor", "disabled", "voltage";
>>> };
>>
>> It seems you are just listing out all possible modes. Why do you need
>> this in the DT at all? This can be inferred by the compatible string.
>
> There are tree sensor, each of one can be one of three type ("thermal
> diode", "thermistor", "voltage") or be disabled.
> Also there are at least five platform depended registers, most of them
> are enable/disable.
> You can find full datasheet here
> https://www.nuvoton.com/hq/products/cloud-computing/hardware-monitors/desktop-server-series/nct7802y/
>
> The question is how to describe configuration of this registers in dts.
> The second option is array of types for tree registers.

Okay, got it. I would go with option 2 in that case. Perhaps "mode"
instead of "type" though.

Rob
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