linux-kernel - Re: [PATCH v2 2/4] dt-bindings: timer: atmel,at91sam9260-pit: convert to yaml

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Message-ID: <f4c04190-c90e-bf5f-f666-c979a7aee8ce@microchip.com>
Date:   Mon, 29 May 2023 12:32:49 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Conor.Dooley@...rochip.com>
CC:     <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>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] dt-bindings: timer: atmel,at91sam9260-pit: convert
 to yaml

On 29.05.2023 15:17, Conor Dooley wrote:
> Hey Claudiu,
> 
> On Mon, May 29, 2023 at 09:26:02AM +0300, 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 | 96 +++++++++++++++++++
>>  2 files changed, 96 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..1cc7b7494e4b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/timer/atmel,at91sam9260-pit.yaml
>> @@ -0,0 +1,96 @@
>> +# 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:
>> +    enum:
>> +      - atmel,at91sam9260-pit
>> +      - microchip,sam9x60-pit64b
> 
> The missing compatible should probably be added here, rather than
> removed from the devicetree.
> 
>> +
>> +  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:
>> +            Contain interrupt for the PIT which is the IRQ line shared across all
>> +            System Controller members.
> 
> I think you should drop this & the corresponding section below, since
> both PIT and PIT64 have a single interrupt.

OK. Just wanted to emphasize with this that in case of PIT the interrupt
may be shared with other IPs.

> 
> Thanks,
> Conor.
> 
>> +        clocks:
>> +          maxItems: 1
>> +
>> +    else:
>> +      properties:
>> +        interrupts:
>> +          description:
>> +            PIT64B peripheral interrupt identifier.
>> +        clocks:
>> +          minItems: 2
>> +        clock-names:
>> +          items:
>> +            - const: pclk
>> +            - const: gclk
>> +      required:
>> +        - clock-names
>