linux-kernel - Re: [PATCH v2 1/3] dt-bindings: watchdog: sunxi: Add compatible for R329

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Message-ID: <20210818090732.wdickyw67oc4zqpt@gilmour>
Date:   Wed, 18 Aug 2021 11:07:32 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: watchdog: sunxi: Add compatible for
 R329

Hi,

On Wed, Aug 04, 2021 at 11:57:14PM -0500, Samuel Holland wrote:
> On existing SoCs, the watchdog has a single clock input: HOSC (OSC24M)
> divided by 750.  However, starting with R329, LOSC (OSC32k) is added as
> an alternative clock source, with a bit to switch between them.
> 
> Since 24 MHz / 750 == 32 kHz, not 32.768 kHz, the hardware adjusts the
> cycle counts to keep the timeouts independent of the clock source. This
> keeps the programming interface backward-compatible.
> 
> R329 also adds two new registers, to allow software to immediately drive
> the SoC reset signal.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> Changes v1 to v2:
>  - Switch from enum to const
>  - Add descriptions to "clocks" items
> 
>  .../watchdog/allwinner,sun4i-a10-wdt.yaml     | 32 ++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml b/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml
> index 9aa3c313c49f..8fa5b0d32381 100644
> --- a/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml
> @@ -24,6 +24,7 @@ properties:
>                - allwinner,sun50i-a100-wdt
>                - allwinner,sun50i-h6-wdt
>                - allwinner,sun50i-h616-wdt
> +              - allwinner,sun50i-r329-wdt
>            - const: allwinner,sun6i-a31-wdt
>        - items:
>            - const: allwinner,suniv-f1c100s-wdt
> @@ -33,7 +34,18 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - description: High-frequency oscillator input, divided internally
> +      - description: Low-frequency oscillator input, only found on some variants
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - const: hosc
> +      - const: losc
>  
>    interrupts:
>      maxItems: 1
> @@ -44,6 +56,24 @@ required:
>    - clocks
>    - interrupts
>  
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - allwinner,sun50i-r329-wdt
> +
> +then:
> +  properties:
> +    clocks:
> +      minItems: 2
> +
> +    clock-names:
> +      minItems: 2
> +
> +  required:
> +    - clock-names
> +

We should also make sure through an else clause that all the other SoCs
have a length of one for both clocks and clock-names

Also, it looks like you forgot the patch to enable the compatible in the
driver?

Maxime

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