linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: tyhx,hx9023s: Add performance tuning configuration

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Message-ID: <mzymeyslfhnxpnmiqtmmavn2tyx4mm67f5oy6m5pw7sogcuqn4@uexouiqfkdeb>
Date: Thu, 26 Sep 2024 08:53:49 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yasin Lee <yasin.lee.x@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>, 
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, yasin.lee.x@...look.com, 
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: tyhx,hx9023s: Add performance
 tuning configuration

On Thu, Sep 26, 2024 at 12:40:17AM +0800, Yasin Lee wrote:
> When hardware design introduces significant sensor data noise,
> performance can be improved by adjusting register settings.
> 
> Signed-off-by: Yasin Lee <yasin.lee.x@...il.com>
> ---
>  .../bindings/iio/proximity/tyhx,hx9023s.yaml          | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml b/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
> index 64ce8bc8bd36..0673c40472bd 100644
> --- a/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
> +++ b/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
> @@ -28,6 +28,18 @@ properties:
>  
>    vdd-supply: true
>  
> +  tyhx,performance-tuning:
> +    description:
> +      Optional, When hardware design introduces significant sensor data noise,
> +      performance can be improved by adjusting register settings, including
> +      but not limited to sample integration time and average sample count.
> +      Performance tuning parameters represented as register address-value pairs.
> +      The array consists of 8-bit values, where each pair represents a register
> +      address followed by the value to be written to that register.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array

I think you wanted here in such case uint8-matrix with one dimension set
to two and other 256 or whatever.

I also wonder why do allow any register to be tuned. To me "tuning"
sounds like improving or tweaking the configuration, so for example I
would not expect to change some control-like registers, e.g. interrupts,
enable/disable, reset etc.


> +    minItems: 2
> +    maxItems: 512
> +
>    "#address-cells":
>      const: 1
>  
> @@ -65,6 +77,13 @@ examples:
>          interrupt-parent = <&pio>;
>          interrupts = <16 IRQ_TYPE_EDGE_FALLING>;
>          vdd-supply = <&pp1800_prox>;
> +        tyhx,performance-tuning = [00 00

This above is clearing entirely the GLOBAL_CTRL0 register, which is not
tuning.

You are basically avoiding hardware description as properties in DT and
just dump a blob.


Best regards,
Krzysztof