linux-kernel - Re: [PATCH v2 2/4] dt-bindings: rtc: lpc32xx-rtc: convert to dtschema

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Date: Thu, 11 Apr 2024 08:17:55 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Jiaxun Yang <jiaxun.yang@...goat.com>,
 Vladimir Zapolskiy <vz@...ia.com>, Joel Stanley <joel@....id.au>,
 Andrew Jeffery <andrew@...econstruct.com.au>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>, linux-rtc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v2 2/4] dt-bindings: rtc: lpc32xx-rtc: convert to dtschema

On 10/04/2024 22:43, Alexandre Belloni wrote:
> On 10/04/2024 17:55:34+0200, Javier Carrasco wrote:
>> Convert existing binding to dtschema to support validation.
>>
>> Add the undocumented 'clocks' property.
>>
>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
>> ---
>>  .../devicetree/bindings/rtc/lpc32xx-rtc.txt        | 15 --------
>>  .../devicetree/bindings/rtc/nxp,lpc32xx-rtc.yaml   | 41 ++++++++++++++++++++++
>>  2 files changed, 41 insertions(+), 15 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt b/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt
>> deleted file mode 100644
>> index a87a1e9bc060..000000000000
>> --- a/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt
>> +++ /dev/null
>> @@ -1,15 +0,0 @@
>> -* NXP LPC32xx SoC Real Time Clock controller
>> -
>> -Required properties:
>> -- compatible: must be "nxp,lpc3220-rtc"
>> -- reg: physical base address of the controller and length of memory mapped
>> -  region.
>> -- interrupts: The RTC interrupt
>> -
>> -Example:
>> -
>> -	rtc@...24000 {
>> -		compatible = "nxp,lpc3220-rtc";
>> -		reg = <0x40024000 0x1000>;
>> -		interrupts = <52 0>;
>> -	};
>> diff --git a/Documentation/devicetree/bindings/rtc/nxp,lpc32xx-rtc.yaml b/Documentation/devicetree/bindings/rtc/nxp,lpc32xx-rtc.yaml
>> new file mode 100644
>> index 000000000000..62ddeef961e9
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/rtc/nxp,lpc32xx-rtc.yaml
>> @@ -0,0 +1,41 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/rtc/nxp,lpc32xx-rtc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NXP LPC32xx SoC Real Time Clock
>> +
>> +maintainers:
>> +  - Javier Carrasco <javier.carrasco.cruz@...il.com>
>> +
>> +allOf:
>> +  - $ref: rtc.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: nxp,lpc3220-rtc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
> 
> As I explained the clock doesn't really exist, there is no control over
> it, it is a fixed 32768 Hz crystal, there is no point in describing it
> as this is already the input clock of the SoC.

That's common for many SoCs but it is still (at least for them) input to
the RTC. On some SoC boards 32 kHz is controllable.

But if you think it is not correct here, then we should drop it from DTS.

Best regards,
Krzysztof