linux-kernel - Re: [PATCH] dt-bindings: pincfg-node: Add "input-schmitt" property

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Message-ID: <20240715-strainer-creamlike-b1ff49b25c1f@spud>
Date: Mon, 15 Jul 2024 17:19:41 +0100
From: Conor Dooley <conor@...nel.org>
To: Inochi Amaoto <inochiama@...look.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pincfg-node: Add "input-schmitt" property

On Mon, Jul 15, 2024 at 05:55:28PM +0800, Inochi Amaoto wrote:
> On Mon, Jul 15, 2024 at 11:21:25AM GMT, Krzysztof Kozlowski wrote:
> > On 14/07/2024 13:28, Inochi Amaoto wrote:
> > > On Sophgo CV18XX platform, threshold strength of schmitt trigger can
> > > be configured. As this standard property is already supported by the
> > > common pinconf code. Add "input-schmitt" property in pincfg-node.yaml
> > > so that other platforms requiring such feature can make use of this
> > > property.
> > > 
> > > Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> > > ---
> > >  Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> > > index d0af21a564b4..e838fcac7f2a 100644
> > > --- a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> > > +++ b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> > > @@ -88,6 +88,10 @@ properties:
> > >      description: disable input on pin (no effect on output, such as
> > >        disabling an input buffer)
> > > 
> > > +  input-schmitt:
> > > +    $ref: /schemas/types.yaml#/definitions/uint32
> > > +    description: threshold strength for schmitt-trigger
> > 
> > Strength in which units? This should have proper property name suffix.
> > 
> 
> I think it should be mV. Using voltage may leads to decimal.

The standard suffix for voltage is "-microvolts", so no issues with
decimals :) And with a standard suffix, the $ref can be dropped.

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