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Message-ID: <20220925153628.GA1758026@roeck-us.net>
Date: Sun, 25 Sep 2022 08:36:28 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Sergiu Moga <sergiu.moga@...rochip.com>
Cc: wim@...ux-watchdog.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, nicolas.ferre@...rochip.com,
alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
eugen.hristev@...rochip.com, linux-watchdog@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2] watchdog: dt-bindings: atmel,at91sam9-wdt: convert to
json-schema
On Thu, Jul 14, 2022 at 03:51:24PM +0300, Sergiu Moga wrote:
> Convert at91sam9 WDT binding for Atmel/Microchip SoCs to json-schema
> format.
>
> Signed-off-by: Sergiu Moga <sergiu.moga@...rochip.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
>
> v1 -> v2:
> - move "allOf" under "required"
>
> .../bindings/watchdog/atmel,at91sam9-wdt.yaml | 127 ++++++++++++++++++
> .../bindings/watchdog/atmel-wdt.txt | 51 -------
> 2 files changed, 127 insertions(+), 51 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/watchdog/atmel,at91sam9-wdt.yaml
> delete mode 100644 Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
>
> diff --git a/Documentation/devicetree/bindings/watchdog/atmel,at91sam9-wdt.yaml b/Documentation/devicetree/bindings/watchdog/atmel,at91sam9-wdt.yaml
> new file mode 100644
> index 000000000000..ad27bc518670
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/atmel,at91sam9-wdt.yaml
> @@ -0,0 +1,127 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/atmel,at91sam9-wdt.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel Watchdog Timers
> +
> +maintainers:
> + - Eugen Hristev <eugen.hristev@...rochip.com>
> +
> +properties:
> + compatible:
> + const: atmel,at91sam9260-wdt
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + atmel,max-heartbeat-sec:
> + description:
> + Should contain the maximum heartbeat value in seconds. This value
> + should be less or equal to 16. It is used to compute the WDV field.
> + maximum: 16
> +
> + atmel,min-heartbeat-sec:
> + description:
> + Should contain the minimum heartbeat value in seconds. This value
> + must be smaller than the max-heartbeat-sec value. It is used to
> + compute the WDD field.
> + maximum: 16
> +
> + atmel,watchdog-type:
> + $ref: /schemas/types.yaml#/definitions/string
> + description: |
> + Should be hardware or software.
> + oneOf:
> + - description:
> + Hardware watchdog uses the at91 watchdog reset.
> + const: hardware
> + - description: |
> + Software watchdog uses the watchdog interrupt
> + to trigger a software reset.
> + const: software
> + default: hardware
> +
> + atmel,reset-type:
> + $ref: /schemas/types.yaml#/definitions/string
> + description: |
> + Should be proc or all. This is valid only when using hardware watchdog.
> + oneOf:
> + - description:
> + Assert peripherals and processor reset signals.
> + const: all
> + - description:
> + Assert the processor reset signal.
> + const: proc
> + default: all
> +
> + atmel,disable:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Should be present if you want to stop the watchdog.
> +
> + atmel,idle-halt:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description: |
> + Should be present if you want to stop the watchdog when
> + entering idle state.
> + CAUTION: This property should be used with care, it actually makes the
> + watchdog not counting when the CPU is in idle state, therefore the
> + watchdog reset time depends on mean CPU usage and will not reset at all
> + if the CPU stops working while it is in idle state, which is probably
> + not what you want.
> +
> + atmel,dbg-halt:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description: |
> + Should be present if you want to stop the watchdog when
> + entering debug state.
> +
> +required:
> + - compatible
> + - reg
> + - clocks
> +
> +allOf:
> + - $ref: watchdog.yaml#
> + - if:
> + properties:
> + atmel,reset-type:
> + enum:
> + - all
> + - proc
> + then:
> + properties:
> + atmel,watchdog-type:
> + const: hardware
> +
> +dependencies:
> + atmel,reset-type: ['atmel,watchdog-type']
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> +
> + watchdog@...ffd40 {
> + compatible = "atmel,at91sam9260-wdt";
> + reg = <0xfffffd40 0x10>;
> + interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> + clocks = <&clk32k>;
> + timeout-sec = <15>;
> + atmel,watchdog-type = "hardware";
> + atmel,reset-type = "all";
> + atmel,dbg-halt;
> + atmel,idle-halt;
> + atmel,max-heartbeat-sec = <16>;
> + atmel,min-heartbeat-sec = <0>;
> + };
> diff --git a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> deleted file mode 100644
> index 711a880b3d3b..000000000000
> --- a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> +++ /dev/null
> @@ -1,51 +0,0 @@
> -* Atmel Watchdog Timers
> -
> -** at91sam9-wdt
> -
> -Required properties:
> -- compatible: must be "atmel,at91sam9260-wdt".
> -- reg: physical base address of the controller and length of memory mapped
> - region.
> -- clocks: phandle to input clock.
> -
> -Optional properties:
> -- timeout-sec: contains the watchdog timeout in seconds.
> -- interrupts : Should contain WDT interrupt.
> -- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
> - seconds. This value should be less or equal to 16. It is used to
> - compute the WDV field.
> -- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
> - seconds. This value must be smaller than the max-heartbeat-sec value.
> - It is used to compute the WDD field.
> -- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
> - use the at91 watchdog reset. Software watchdog use the watchdog
> - interrupt to trigger a software reset.
> -- atmel,reset-type : Should be "proc" or "all".
> - "all" : assert peripherals and processor reset signals
> - "proc" : assert the processor reset signal
> - This is valid only when using "hardware" watchdog.
> -- atmel,disable : Should be present if you want to disable the watchdog.
> -- atmel,idle-halt : Should be present if you want to stop the watchdog when
> - entering idle state.
> - CAUTION: This property should be used with care, it actually makes the
> - watchdog not counting when the CPU is in idle state, therefore the
> - watchdog reset time depends on mean CPU usage and will not reset at all
> - if the CPU stop working while it is in idle state, which is probably
> - not what you want.
> -- atmel,dbg-halt : Should be present if you want to stop the watchdog when
> - entering debug state.
> -
> -Example:
> - watchdog@...ffd40 {
> - compatible = "atmel,at91sam9260-wdt";
> - reg = <0xfffffd40 0x10>;
> - interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> - clocks = <&clk32k>;
> - timeout-sec = <15>;
> - atmel,watchdog-type = "hardware";
> - atmel,reset-type = "all";
> - atmel,dbg-halt;
> - atmel,idle-halt;
> - atmel,max-heartbeat-sec = <16>;
> - atmel,min-heartbeat-sec = <0>;
> - };
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