linux-kernel - Re: [PATCH v2 07/16] hwmon: (mr75203) add VM active channels property for Moortec PVT controller

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Message-ID: <20220818200753.GA3288506@roeck-us.net>
Date:   Thu, 18 Aug 2022 13:07:53 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eliav Farber <farbere@...zon.com>
Cc:     jdelvare@...e.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, talel@...zon.com, hhhawa@...zon.com,
        jonnyc@...zon.com, hanochu@...zon.com, ronenk@...zon.com,
        itamark@...zon.com, shellykz@...zon.com, shorer@...zon.com,
        amitlavi@...zon.com, almogbs@...zon.com, dwmw@...zon.co.uk,
        rtanwar@...linear.com
Subject: Re: [PATCH v2 07/16] hwmon: (mr75203) add VM active channels
 property for Moortec PVT controller

On Wed, Aug 17, 2022 at 05:43:12AM +0000, Eliav Farber wrote:
> Add optional "vm-active-channels" property to define the number of
> active channels per VM.
> 
> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
>  .../devicetree/bindings/hwmon/moortec,mr75203.yaml       | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> index da9c3cdcb6f0..6111b5069b3c 100644
> --- a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> @@ -49,6 +49,13 @@ properties:
>        reset-control-skip bool property defines if obtaining a
>        reference to a reset controller should be skipped.
>  
> +  vm-active-channels:
> +    description:
> +      vm-active-channels defines the number of channels per VM
> +      that are actually used and are connected to some source.
> +      A value of 0 means that the entire VM sensor is nou used.

not ?

> +    $ref: /schemas/types.yaml#definitions/uint8-array
> +
>  required:
>    - compatible
>    - reg
> @@ -60,6 +67,7 @@ required:
>  additionalProperties:
>    - intel,vm-map
>    - reset-control-skip
> +  - vm-active-channels
>  
>  examples:
>    - |
> @@ -73,5 +81,6 @@ examples:
>          intel,vm-map = [03 01 04 ff ff];
>          clocks = <&osc0>;
>          resets = <&rcu0 0x40 7>;
> +        vm-active-channels = [08 10 02];

Is that how properties are defined nowadays ? I am left with
no clues how this is supposed to be interpreted by a driver.
What does "08 10 02" mean ? How does that refer to "the number of
active channels per VM" ?

Also, I am not a devicetree expert, but I am quite sure that all
those chip specific properties would need a vendor prefix.

Guenter

>          #thermal-sensor-cells = <1>;
>      };