linux-kernel - Re: [PATCH] pinctrl/sunxi: adding input-debounce-ns property

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Date:   Thu, 4 Mar 2021 16:51:57 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Marjan Pascolo <marjan.pascolo@...xom.it>
Cc:     wens@...e.org, Jernej Skrabec <jernej.skrabec@...l.net>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl/sunxi: adding input-debounce-ns property

On Fri, Feb 26, 2021 at 01:53:00PM +0100, Marjan Pascolo wrote:
> Hi Maxime,
> 
> Il 17/02/2021 12:03, Maxime Ripard ha scritto:
> > Hi,
> > 
> > On Wed, Feb 10, 2021 at 05:22:37PM +0100, Marjan Pascolo wrote:
> > > On Allwinner SoC interrupt debounce can be controlled by two oscillator
> > > (32KHz and 24MHz) and a prescale divider.
> > > Oscillator and prescale divider are set through
> > > device tree property "input-debounce" which have 1uS accuracy.
> > > For acheive nS precision a new device tree poperty is made
> > > named "input-debounce-ns".
> > > "input-debounce-ns" is checked only if "input-debounce"
> > > property is not defined.
> > > 
> > > Suggested-by: Maxime Ripard <maxime@...no.tech>
> > > Signed-off-by: Marjan Pascolo <marjan.pascolo@...xom.it>
> > > ---
> > > ---
> > >   .../pinctrl/allwinner,sun4i-a10-pinctrl.yaml  |  9 +++++++
> > >   drivers/pinctrl/sunxi/pinctrl-sunxi.c         | 25 ++++++++++++++++---
> > >   2 files changed, 30 insertions(+), 4 deletions(-)
> > > 
> > > diff --git
> > > a/Documentation/devicetree/bindings/pinctrl/allwinner,sun4i-a10-pinctrl.yaml
> > > b/Documentation/devicetree/bindings/pinctrl/allwinner,sun4i-a10-pinctrl.yaml
> > > index 5240487dfe50..346776de3a44 100644
> > > ---
> > > a/Documentation/devicetree/bindings/pinctrl/allwinner,sun4i-a10-pinctrl.yaml
> > > +++
> > > b/Documentation/devicetree/bindings/pinctrl/allwinner,sun4i-a10-pinctrl.yaml
> > > @@ -93,6 +93,15 @@ properties:
> > >       minItems: 1
> > >       maxItems: 5
> > > 
> > > +  input-debounce-ns:
> > > +    description:
> > > +      Debouncing periods in nanoseconds, one period per interrupt
> > > +      bank found in the controller.
> > > +      Only checked if input-debounce is not present
> > > +    $ref: /schemas/types.yaml#/definitions/uint32-array
> > > +    minItems: 1
> > > +    maxItems: 5
> > > +
> > This should be a separate patch, with the DT maintainers in Cc.
> > 
> > You should enforce that the properties are mutually exclusive through
> > the schema too
> 
> I'm sorry, I've ignored documentaion about /Documentation.
> 
> I see that some additional YAML operator (like oneOf) are used.
> 
> oneOf should fit the schema, but I can't understand if oneOf's options must
> be a literal value, or if could also be a node.
> 
> Otherwise I'll use if ..then..else.

dependencies is what you're looking for, not oneOf or if

Maxime

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