Subject: Re: [RFC/PATCH v2 01/16] dt-bindings: soc: bcm: bcm2835-pm: Convert bindings to DT schema

From: Rob Herring <[email-masked]>
Date: Wed, 10 Feb 2021 16:26:57 -0600

On Tue, Feb 09, 2021 at 01:58:57PM +0100, Nicolas Saenz Julienne wrote:
> This converts the brcm,bcm2835-pm bindings from text to proper schema.
> 
> Signed-off-by: Nicolas Saenz Julienne <[email-masked]>
> ---
>  .../bindings/soc/bcm/brcm,bcm2835-pm.txt      | 46 -----------
>  .../bindings/soc/bcm/brcm,bcm2835-pm.yaml     | 79 +++++++++++++++++++
>  2 files changed, 79 insertions(+), 46 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt
>  create mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt
> deleted file mode 100644
> index 72ff033565e5..000000000000
> --- a/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt
> +++ /dev/null
> @@ -1,46 +0,0 @@
> -BCM2835 PM (Power domains, watchdog)
> -
> -The PM block controls power domains and some reset lines, and includes
> -a watchdog timer.  This binding supersedes the brcm,bcm2835-pm-wdt
> -binding which covered some of PM's register range and functionality.
> -
> -Required properties:
> -
> -- compatible:		Should be "brcm,bcm2835-pm"
> -- reg:			Specifies base physical address and size of the two
> -			  register ranges ("PM" and "ASYNC_BRIDGE" in that
> -			  order)
> -- clocks:		a) v3d: The V3D clock from CPRMAN
> -			b) peri_image: The PERI_IMAGE clock from CPRMAN
> -			c) h264: The H264 clock from CPRMAN
> -			d) isp: The ISP clock from CPRMAN
> -- #reset-cells: 	Should be 1.  This property follows the reset controller
> -			  bindings[1].
> -- #power-domain-cells:	Should be 1.  This property follows the power domain
> -			  bindings[2].
> -
> -Optional properties:
> -
> -- timeout-sec:		Contains the watchdog timeout in seconds
> -- system-power-controller: Whether the watchdog is controlling the
> -    system power.  This node follows the power controller bindings[3].
> -
> -[1] Documentation/devicetree/bindings/reset/reset.txt
> -[2] Documentation/devicetree/bindings/power/power-domain.yaml
> -[3] Documentation/devicetree/bindings/power/power-controller.txt
> -
> -Example:
> -
> -pm {
> -	compatible = "brcm,bcm2835-pm", "brcm,bcm2835-pm-wdt";
> -	#power-domain-cells = <1>;
> -	#reset-cells = <1>;
> -	reg = <0x7e100000 0x114>,
> -	      <0x7e00a000 0x24>;
> -	clocks = <&clocks BCM2835_CLOCK_V3D>,
> -		 <&clocks BCM2835_CLOCK_PERI_IMAGE>,
> -		 <&clocks BCM2835_CLOCK_H264>,
> -		 <&clocks BCM2835_CLOCK_ISP>;
> -	clock-names = "v3d", "peri_image", "h264", "isp";
> -	system-power-controller;
> -};
> diff --git a/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml
> new file mode 100644
> index 000000000000..8bc65e5f62a7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/soc/bcm/brcm,bcm2835-pm.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: BCM2835 PM (Power domains, watchdog)
> +
> +description: |
> +  The PM block controls power domains and some reset lines, and includes a
> +  watchdog timer.
> +
> +maintainers:
> +  - Nicolas Saenz Julienne <[email-masked]>
> +
> +allOf:
> +  - $ref: ../../watchdog/watchdog.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - brcm,bcm2835-pm
> +      - const: brcm,bcm2835-pm-wdt

Odd...

> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    description: Specifies base physical address and size of the two register
> +                 ranges, "PM" and "ASYNC_BRIDGE" in that order.

The number, what they are and order are captured with:

items:
  - description: PM registers
  - description: ASYNC_BRIDGE registers

'Specifies base physical address and size' is every 'reg'.

> +
> +  "#power-domain-cells":
> +    const: 1
> +
> +  "#reset-cells":
> +    const: 1
> +
> +  clocks:
> +    minItems: 4
> +    maxItems: 4
> +
> +  clock-names:
> +    items:
> +      - const: v3d
> +      - const: peri_image
> +      - const: h264
> +      - const: isp
> +
> +  system-power-controller:
> +    type: boolean
> +
> +  timeout-sec: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#power-domain-cells"
> +  - "#reset-cells"
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/bcm2835.h>
> +
> +    watchdog@7e100000 {
> +        compatible = "brcm,bcm2835-pm", "brcm,bcm2835-pm-wdt";
> +        #power-domain-cells = <1>;
> +        #reset-cells = <1>;
> +        reg = <0x7e100000 0x114>,
> +              <0x7e00a000 0x24>;
> +        clocks = <&clocks BCM2835_CLOCK_V3D>,
> +        	 <&clocks BCM2835_CLOCK_PERI_IMAGE>,
> +        	 <&clocks BCM2835_CLOCK_H264>,
> +        	 <&clocks BCM2835_CLOCK_ISP>;
> +        clock-names = "v3d", "peri_image", "h264", "isp";
> +        system-power-controller;
> +    };
> -- 
> 2.30.0
> 

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