linux-kernel - Re: [PATCH v2 3/5] dt-bindings: iio: temperature: ltc2983: refine

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Message-ID: <20221023135124.1fdeab5e@jic23-huawei>
Date:   Sun, 23 Oct 2022 13:51:24 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cosmin Tanislav <demonsingur@...il.com>
Cc:     Nuno Sá <nuno.sa@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Cosmin Tanislav <cosmin.tanislav@...log.com>
Subject: Re: [PATCH v2 3/5] dt-bindings: iio: temperature: ltc2983: refine

On Thu, 20 Oct 2022 12:02:55 +0300
Cosmin Tanislav <demonsingur@...il.com> wrote:

> From: Cosmin Tanislav <cosmin.tanislav@...log.com>
> 
>  * make sure addresses are represented as hex
>  * add note about wrong unit value for adi,mux-delay-config-us
>  * simplify descriptions
>  * add descriptions for the items of custom sensor tables
>  * add default property values where applicable
>  * use conditionals to extend minimum reg value
>    for single ended sensors
>  * remove " around phandle schema $ref
>  * remove label from example and use generic temperature
>    sensor name
> 
> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>

Hi Cosmin,

Just one question inline from me (other than the build bot report that I'll
assume you'll fix for v3).

Otherwise looks like a nice cleanup to me.

I wonder a bit on whether it is worth splitting up, but that would be
rather messy to actually do so will leave that to the dt experts to comment
on.

Jonathan


> ---
>  .../bindings/iio/temperature/adi,ltc2983.yaml | 309 +++++++++++-------
>  1 file changed, 182 insertions(+), 127 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> index 722781aa4697..3e97ec841fd6 100644
> --- a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> +++ b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> @@ -26,25 +26,25 @@ properties:
>  
>    adi,mux-delay-config-us:
>      description:
> -      The LTC2983 performs 2 or 3 internal conversion cycles per temperature
> -      result. Each conversion cycle is performed with different excitation and
> -      input multiplexer configurations. Prior to each conversion, these
> -      excitation circuits and input switch configurations are changed and an
> -      internal 1ms delay ensures settling prior to the conversion cycle in most
> -      cases. An extra delay can be configured using this property. The value is
> -      rounded to nearest 100us.
> +      Extra delay prior to each conversion, in addition to the internal 1ms
> +      delay, for the multiplexer to switch input configurations and
> +      excitation values.
> +
> +      This property is supposed to be in microseconds, but to maintain
> +      compatibility, this value will be multiplied by 100 before usage.

This new text has me a little confused.  Previously we talked rounding, now it
is saying the value is multiplied (which would make it definitely not in micro
secs!)..  So are we papering over a driver bug here?