linux-kernel - Re: [PATCH v2 4/8] dt-bindings: timer: Add schema for realtek,otto-timer

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Message-ID: <533ba27e-a286-4b2e-8560-07148796e1d5@alliedtelesis.co.nz>
Date: Wed, 26 Jun 2024 21:07:02 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Krzysztof Kozlowski <krzk@...nel.org>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "tsbogend@...ha.franken.de"
	<tsbogend@...ha.franken.de>, "daniel.lezcano@...aro.org"
	<daniel.lezcano@...aro.org>, "paulburton@...nel.org" <paulburton@...nel.org>,
	"peterz@...radead.org" <peterz@...radead.org>, "mail@...ger-koblitz.de"
	<mail@...ger-koblitz.de>, "bert@...t.com" <bert@...t.com>, "john@...ozen.org"
	<john@...ozen.org>, "sander@...nheule.net" <sander@...nheule.net>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>, "kabel@...nel.org"
	<kabel@...nel.org>, "ericwouds@...il.com" <ericwouds@...il.com>
Subject: Re: [PATCH v2 4/8] dt-bindings: timer: Add schema for
 realtek,otto-timer


On 26/06/24 19:13, Krzysztof Kozlowski wrote:
> On 24/06/2024 07:21, Chris Packham wrote:
>> On 24/06/24 16:49, Krzysztof Kozlowski wrote:
>>> On 24/06/2024 03:22, Chris Packham wrote:
>>>> Add the devicetree schema for the realtek,otto-timer present on a number
>>>> of Realtek SoCs.
>>>>
>>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>> ---
>>>>
>>>> Notes:
>>>>       Changes in v2:
>>>>       - Use specific compatible
>>> Where? I do not see changes.
>> In v1 it was rtl930x-timer, I've updated it to rtl9302-timer
> Ah, I thought you wanted to switch from generic fallback to specific
> compatible... fine.
>
>>>>       - Remove unnecessary label
>>>>       - Remove unused irq flags (interrupt controller is one-cell)
>>>>       - Set minItems for reg and interrupts based on compatible
>>>>
>>>>    .../bindings/timer/realtek,otto-timer.yaml    | 66 +++++++++++++++++++
>>>>    1 file changed, 66 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/timer/realtek,otto-timer.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/timer/realtek,otto-timer.yaml b/Documentation/devicetree/bindings/timer/realtek,otto-timer.yaml
>>>> new file mode 100644
>>>> index 000000000000..13ea7aa946fe
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/timer/realtek,otto-timer.yaml
>>>> @@ -0,0 +1,66 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/timer/realtek,otto-timer.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Realtek Otto SoCs Timer/Counter
>>>> +
>>>> +description:
>>>> +  Realtek SoCs support a number of timers/counters. These are used
>>>> +  as a per CPU clock event generator and an overall CPU clocksource.
>>>> +
>>>> +maintainers:
>>>> +  - Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>> +
>>>> +properties:
>>>> +  $nodename:
>>>> +    pattern: "^timer@[0-9a-f]+$"
>>>> +
>>>> +  compatible:
>>>> +    items:
>>>> +      - enum:
>>>> +          - realtek,rtl9302-timer
>>>> +      - const: realtek,otto-timer
>>>> +
>>>> +  reg:
>>>> +    maxItems: 5
>>> Nothing improved.
>>>
>>>> +
>>>> +  clocks:
>>>> +    maxItems: 1
>>>> +
>>>> +  interrupts:
>>>> +    maxItems: 5
>>> Nothing improved.
>>>
>>>> +
>>>> +allOf:
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            const: realtek,rtl9302-timer
>>>> +    then:
>>>> +      properties:
>>>> +        reg:
>>>> +          minItems: 2
>>>> +        interrupts:
>>>> +          minItems: 2
>>> No, that's just incorrect. You do not have more than one variant, so it
>>> is just 2 items. Or 5 items, not 2-5.
>> I've been told in the past that the device-tree should describe the
>> hardware. Which in this case has 5 timers. But I'm also told to give
>> them names which I struggle to do because some of them aren't used.
> Used as in Linux driver? Does not matter.
>
>> So do you want something like this:
>>
>> clocks:
>>       items:
>>           - description: CPU0 event clock
>>           - description: system clock source
>>           - description: unused
>>           - description: unused
>>           - description: unused
> No, if your datasheet or any other source of information (e.g.
> downstream sources) mention 5 items, then name properly 5 items.
> Otherwise how do you know that there are 5, not 2, clocks/interrupts/reg?

So just timer0, timer2, ... timer5?