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

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Message-ID: <20221027162648.mowz2lefcajv3s2q@mercury.elektranox.org>
Date:   Thu, 27 Oct 2022 18:26:48 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Johan Jonker <jbx6244@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        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 Thu, Oct 27, 2022 at 06:11:19PM +0200, Johan Jonker wrote:
> On 10/25/22 00:05, Sebastian Reichel wrote:
> > 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.
> 
> Didn't note you were doing a conversion as well...
> From my abandonment patch serie
> 
>   clock-frequency:
>     enum: [1, 32, 1024, 32768]
> 
> The data sheet shows that it can generate 4 different frequencies.
> Rockchip mostly uses 32768, but that doesn't mean someone else is
> not alowed to set what he/she prefers.

As far as I can tell 32768 has been cargo copied by everyone, but
the driver is not parsing this at all and I would expect the clock
API to be used for requesting a specific frequency.

-- Sebastian

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