Date:   Fri, 9 Jun 2023 10:22:24 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <krzysztof.kozlowski@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
        <wim@...ux-watchdog.org>, <linux@...ck-us.net>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] dt-bindings: timer: atmel,at91sam9260-pit: convert
 to yaml

On 31.05.2023 11:55, Krzysztof Kozlowski wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 30/05/2023 11:07, Claudiu Beznea wrote:
>> Convert Microchip AT91 PIT bindings to YAML. Along with it clocks and
>> clock-names bindings were added as the drivers needs it to ensure proper
>> hardware functionality.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>>  .../devicetree/bindings/arm/atmel-sysregs.txt | 12 ---
>>  .../bindings/timer/atmel,at91sam9260-pit.yaml | 99 +++++++++++++++++++
>>  2 files changed, 99 insertions(+), 12 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
>> index 67a66bf74895..54d3f586403e 100644
>> --- a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
>> +++ b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
>> @@ -4,18 +4,6 @@ Chipid required properties:
>>  - compatible: Should be "atmel,sama5d2-chipid" or "microchip,sama7g5-chipid"
>>  - reg : Should contain registers location and length
>>
>> -PIT Timer required properties:
>> -- compatible: Should be "atmel,at91sam9260-pit"
>> -- reg: Should contain registers location and length
>> -- interrupts: Should contain interrupt for the PIT which is the IRQ line
>> -  shared across all System Controller members.
>> -
>> -PIT64B Timer required properties:
>> -- compatible: Should be "microchip,sam9x60-pit64b"
>> -- reg: Should contain registers location and length
>> -- interrupts: Should contain interrupt for PIT64B timer
>> -- clocks: Should contain the available clock sources for PIT64B timer.
>> -
>>  System Timer (ST) required properties:
>>  - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
>>  - reg: Should contain registers location and length
>> diff --git a/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml b/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
>> new file mode 100644
>> index 000000000000..d0f3f80db4cb
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
>> @@ -0,0 +1,99 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/timer/atmel,at91sam9260-pit.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Microchip AT91 Periodic Interval Timer (PIT)
>> +
>> +maintainers:
>> +  - Claudiu Beznea <claudiu.beznea@...rochip.com>
>> +
>> +description:
>> +  Microchip AT91 periodic interval timer provides the operating system scheduler
>> +  interrupt. It is designed to offer maximum accuracy and efficient management,
>> +  even for systems with long response time.
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - items:
>> +          - const: microchip,sama7g5-pit64b
> 
>>From where do you have this compatible? Wasn't in old binding and commit
> msg does not explain it.

ok, I'll update it in the commit message. It is from the available device
trees.

> 
> 
>> +          - const: microchip,sam9x60-pit64b
>> +      - items:
>> +          enum:
> 
> These are not items. Just enum.. Does it even work?

Yes, it compiles w/o issues. I'll update it anyway.

> 
>> +            - atmel,at91sam9260-pit
>> +            - microchip,sam9x60-pit64b
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    minItems: 1
>> +    maxItems: 2
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - clocks
>> +
>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: atmel,at91sam9260-pit
>> +    then:
>> +      properties:
>> +        interrupts:
>> +          description:
>> +            Shared interrupt between all system controller members (power management
>> +            controller, watchdog, PIT, reset controller, real-time timer, real-time
>> +            clock, memory controller, debug unit, system timer).
>> +        clocks:
>> +          maxItems: 1
>> +
>> +    else:
>> +      properties:
>> +        clocks:
>> +          minItems: 2
>> +        clock-names:
>> +          items:
>> +            - const: pclk
>> +            - const: gclk
> 
> interrupts? They are still required, so why no description here?

It was here in the previous versions but Conor suggested to remove it as it
was nothing specific about this description. For the if-then branch I kept
it to specify that the interrupt is share with other devices. In this
branch the interrupt is only for the timer itself. With this, would you
still prefer to add it back?

> 
>> +      required:
>> +        - clock-names
>> +
>> +unevaluatedProperties: false
> 
> additionalProperties:false instead

Having additionalProperties:false instead of unevaluatedProperties: false
thows the following error on make dt_binding_check and make dtbs_check:

Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.example.dtb:
timer@...28000: 'clock-names' does not match any of the regexes:
'pinctrl-[0-9]+'

> 
>> +
> 
> Best regards,
> Krzysztof
> 

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