Date:   Fri, 28 Oct 2022 18:19:57 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Johan Jonker <jbx6244@...il.com>
Cc:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 27/10/2022 18:29:51+0200, Johan Jonker wrote:
> 
> 
> On 10/27/22 18:26, Sebastian Reichel wrote:
> > 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.
> 
> DT and Linux driver support are 2 different things.
> What Linux currently doesn't support might be needed elsewhere.
> 

Yes but being a clock provider is enough for any OS.

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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