linux-kernel - Re: [PATCH 1/1] dt-bindings: rtc: convert hym8563 bindings to json-schema

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Date:   Tue, 25 Oct 2022 00:05:59 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH 1/1] dt-bindings: rtc: convert hym8563 bindings to
 json-schema

Hi,

On Mon, Oct 24, 2022 at 01:50:49PM -0500, Rob Herring wrote:
> On Fri, Oct 21, 2022 at 07:59:26PM -0400, Krzysztof Kozlowski wrote:
> > On 21/10/2022 13:06, Sebastian Reichel wrote:
> > > Convert RTC binding for Haoyu Microelectronics HYM8563 to Device Tree
> > > Schema format.
> > > 
> > > Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> > > ---
> > >  .../devicetree/bindings/rtc/haoyu,hym8563.txt | 30 ----------
> > >  .../bindings/rtc/haoyu,hym8563.yaml           | 55 +++++++++++++++++++
> > >  2 files changed, 55 insertions(+), 30 deletions(-)
> > >  delete mode 100644 Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
> > >  create mode 100644 Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
> > > deleted file mode 100644
> > > index a8934fe2ab4c..000000000000
> > > --- a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
> > > +++ /dev/null
> > > @@ -1,30 +0,0 @@
> > > -Haoyu Microelectronics HYM8563 Real Time Clock
> > > -
> > > -The HYM8563 provides basic rtc and alarm functionality
> > > -as well as a clock output of up to 32kHz.
> > > -
> > > -Required properties:
> > > -- compatible: should be: "haoyu,hym8563"
> > > -- reg: i2c address
> > > -- #clock-cells: the value should be 0
> > > -
> > > -Optional properties:
> > > -- clock-output-names: From common clock binding
> > > -- interrupts: rtc alarm/event interrupt
> > > -
> > > -Example:
> > > -
> > > -hym8563: hym8563@51 {
> > > -	compatible = "haoyu,hym8563";
> > > -	reg = <0x51>;
> > > -
> > > -	interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
> > > -
> > > -	#clock-cells = <0>;
> > > -};
> > > -
> > > -device {
> > > -...
> > > -	clocks = <&hym8563>;
> > > -...
> > > -};
> > > diff --git a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml
> > > new file mode 100644
> > > index 000000000000..b0b6126b12dd
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml
> > > @@ -0,0 +1,55 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > 
> > Dual license please. I don't think you copied any content from original
> > bindings... unless the example?
> > 
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/rtc/haoyu,hym8563.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Haoyu Microelectronics HYM8563 RTC
> > > +
> > > +maintainers:
> > > +  - Alexandre Belloni <alexandre.belloni@...tlin.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: haoyu,hym8563
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  "#clock-cells":
> > > +    const: 0
> > > +
> > > +  clock-output-names:
> > > +    description: From common clock binding to override the default output clock name.
> > 
> > You need maxItems for this.
> > 
> > > +
> > > +  wakeup-source:
> > > +    description: Enables wake up of host system on alarm.
> > > +
> > > +allOf:
> > > +  - $ref: rtc.yaml
> > > +
> > > +unevaluatedProperties: false
> > > +
> > 
> > Would be great if you could also correct DTS using these bindings (see
> > warning from Rob).
> 
> It looked to me like 'clock-frequency' should be added to the schema.

I've sent PATCHv2, which removes clock-frequency from all hym8563
users. My reasoning is, that the old txt binding does not describe
it and the current Linux driver does not handle it as far as I can
see.

https://lore.kernel.org/all/20221024165549.74574-1-sebastian.reichel@collabora.com/

-- Sebastian

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