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

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Message-ID: <202404102043571b7450b5@mail.local>
Date: Wed, 10 Apr 2024 22:43:57 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: 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 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.


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