linux-kernel - Re: [PATCH 1/3] dt-bindings: hwmon: pmbus: add ti tps25990 documentation

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Message-ID: <1j7cbiqeys.fsf@starbuckisacylon.baylibre.com>
Date: Wed, 11 Sep 2024 19:26:19 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Rob Herring <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,  Jean Delvare
 <jdelvare@...e.com>,  Guenter Roeck <linux@...ck-us.net>,  Krzysztof
 Kozlowski <krzk+dt@...nel.org>,  Conor Dooley <conor+dt@...nel.org>,
  Jonathan Corbet <corbet@....net>,  Delphine CC Chiu
 <Delphine_CC_Chiu@...ynn.com>,  linux-hwmon@...r.kernel.org,
  devicetree@...r.kernel.org,  linux-kernel@...r.kernel.org,
  linux-doc@...r.kernel.org,  linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: hwmon: pmbus: add ti tps25990
 documentation

On Wed 11 Sep 2024 at 09:45, Rob Herring <robh@...nel.org> wrote:

> gOn Tue, Sep 10, 2024 at 11:31:18AM +0200, Jerome Brunet wrote:
>> On Tue 10 Sep 2024 at 09:48, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>> 
>> > On Mon, Sep 09, 2024 at 05:39:03PM +0200, Jerome Brunet wrote:
>> >> Add DT binding documentation for the Texas Instruments TPS25990 eFuse
>> >> 
>> >> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> >> ---
>> >>  .../bindings/hwmon/pmbus/ti,tps25990.yaml          | 73 ++++++++++++++++++++++
>> >>  1 file changed, 73 insertions(+)
>> >>
>> >
>> > A nit, subject: drop second/last, redundant "documentation". The
>> > "dt-bindings" prefix is already stating that these are bindings/docs.
>> > See also:
>> > https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18
>> >
>> >> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/ti,tps25990.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/ti,tps25990.yaml
>> >> new file mode 100644
>> >> index 000000000000..e717942b3598
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/ti,tps25990.yaml
>> >> @@ -0,0 +1,73 @@
>> >> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> >> +%YAML 1.2
>> >> +---
>> >> +
>> >
>> > Drop blank line.
>> >
>> >> +$id: http://devicetree.org/schemas/hwmon/pmbus/ti,tps25990.yaml#
>> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> >> +
>> >> +title: Texas Instruments TPS25990 Stackable eFuse
>> >> +
>> >> +maintainers:
>> >> +  - Jerome Brunet <jbrunet@...libre.com>
>> >> +
>> >> +description: |
>> >
>> > Do not need '|' unless you need to preserve formatting.
>> >
>> >> +  The TI TPS25990 is an integrated, high-current circuit
>> >> +  protection and power management device with PMBUS interface
>
> And wrap at 80.
>
>> >> +
>> >> +properties:
>> >> +  compatible:
>> >> +    const: ti,tps25990
>> >> +
>> >> +  reg:
>> >> +    maxItems: 1
>> >> +
>> >> +  ti,rimon-milli-ohms:
>> >> +    description:
>> >> +      milli Ohms value of the resistance installed between the Imon pin
>> >> +      and the ground reference.
>> >
>> > Ohms is not enough? We don't have mOhm in property units.
>> > https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml
>> >
>> 
>> Same discussion as we've had on the driver change.
>> At the moment Ohms is enough for the cases I've seen.
>> 
>> Will it be, not sure.
>> Using mOhms is' way to avoid "S**t, R is 80.2 Ohms, I
>> need another digit to not loose precision " kind of situation and
>> introduce a second property just for that.
>> 
>> No idea if Rimon will get that low. Probably not.
>> 
>> I'll switch to Ohms.
>
> You can can use "-micro-ohms" too. The reason we don't have every 
> possible unit is so we have everyone picking their own.

Noted. after discussing with Guenter, I'll use micro-ohms in the next
version, not ohms

>
> Rob

-- 
Jerome