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

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Message-ID: <20240911144532.GA154835-robh@kernel.org>
Date: Wed, 11 Sep 2024 09:45:32 -0500
From: Rob Herring <robh@...nel.org>
To: Jerome Brunet <jbrunet@...libre.com>
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

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.

Rob