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

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Date:   Thu, 27 Oct 2022 18:11:19 +0200
From:   Johan Jonker <jbx6244@...il.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        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



On 10/25/22 00:05, Sebastian Reichel wrote:
> 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.

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.

Johan

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