Re: [PATCH v2] dt-bindings: watchdog: sp-805: Convert to Json-schema

[Viresh Kumar <viresh.kumar@linaro.org>]

On 09-09-20, 11:50, Andre Przywara wrote:
> Convert the ARM SP-805 watchdog IP DT binding over to Json-schema.
> 
> A straight-forward conversion, but the requirement for providing two
> clocks got strengthened from "should" to "must".
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> Hi,
> 
> this is just the bindings conversion patch, updated to address Rob's
> comments:
> - Remove redundant primecell.yaml inclusion
> - Reference watchdog.yaml
> - Drop now redundant timeout-sec property
> - Add unevaluatedProperties
> 
> The DT fixes are independent and now partly already queued, so I am
> posting this separately.
> 
> Cheers,
> Andre
> 
>  .../bindings/watchdog/arm,sp805.txt           | 32 ---------
>  .../bindings/watchdog/arm,sp805.yaml          | 71 +++++++++++++++++++
>  2 files changed, 71 insertions(+), 32 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/watchdog/arm,sp805.txt
>  create mode 100644 Documentation/devicetree/bindings/watchdog/arm,sp805.yaml
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/arm,sp805.txt b/Documentation/devicetree/bindings/watchdog/arm,sp805.txt
> deleted file mode 100644
> index bee6f1f0e41b..000000000000
> --- a/Documentation/devicetree/bindings/watchdog/arm,sp805.txt
> +++ /dev/null
> @@ -1,32 +0,0 @@
> -ARM AMBA Primecell SP805 Watchdog
> -
> -SP805 WDT is a ARM Primecell Peripheral and has a standard-id register that
> -can be used to identify the peripheral type, vendor, and revision.
> -This value can be used for driver matching.
> -
> -As SP805 WDT is a primecell IP, it follows the base bindings specified in
> -'arm/primecell.txt'
> -
> -Required properties:
> -- compatible:  Should be "arm,sp805" & "arm,primecell"
> -- reg:         Should contain location and length for watchdog timer register
> -- clocks:      Clocks driving the watchdog timer hardware. This list should be
> -               2 clocks. With 2 clocks, the order is wdog_clk, apb_pclk
> -               wdog_clk can be equal to or be a sub-multiple of the apb_pclk
> -               frequency
> -- clock-names: Shall be "wdog_clk" for first clock and "apb_pclk" for the
> -               second one
> -
> -Optional properties:
> -- interrupts:  Should specify WDT interrupt number
> -- timeout-sec: Should specify default WDT timeout in seconds. If unset, the
> -               default timeout is determined by the driver
> -
> -Example:
> -	watchdog@66090000 {
> -		compatible = "arm,sp805", "arm,primecell";
> -		reg = <0x66090000 0x1000>;
> -		interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
> -		clocks = <&wdt_clk>, <&apb_pclk>;
> -		clock-names = "wdog_clk", "apb_pclk";
> -	};
> diff --git a/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml
> new file mode 100644
> index 000000000000..a69cac8ec208
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/arm,sp805.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ARM AMBA Primecell SP805 Watchdog
> +
> +maintainers:
> +  - Viresh Kumar <vireshk@kernel.org>
> +
> +description: |+
> +  The Arm SP805 IP implements a watchdog device, which triggers an interrupt
> +  after a configurable time period. If that interrupt has not been serviced
> +  when the next interrupt would be triggered, the reset signal is asserted.
> +
> +allOf:
> +  - $ref: /schemas/watchdog/watchdog.yaml#
> +
> +# Need a custom select here or 'arm,primecell' will match on lots of nodes
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        const: arm,sp805
> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: arm,sp805
> +      - const: arm,primecell
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: |
> +      Clocks driving the watchdog timer hardware. The first clock is used
> +      for the actual watchdog counter. The second clock drives the register
> +      interface.
> +    minItems: 2
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: wdog_clk
> +      - const: apb_pclk
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    watchdog@66090000 {
> +        compatible = "arm,sp805", "arm,primecell";
> +        reg = <0x66090000 0x1000>;
> +        interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&wdt_clk>, <&apb_pclk>;
> +        clock-names = "wdog_clk", "apb_pclk";
> +    };

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh