linux-kernel - Re: [PATCH v2 1/3] dt-binding: watchdog: add bootstatus reset type documentation

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Message-ID: <20200304170832.GA22914@roeck-us.net>
Date:   Wed, 4 Mar 2020 09:08:32 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     wim@...ux-watchdog.org, robh+dt@...nel.org, mark.rutland@....com,
        joel@....id.au, avifishman70@...il.com, tali.perry1@...il.com,
        yuenn@...gle.com, benjaminfair@...gle.com,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/3] dt-binding: watchdog: add bootstatus reset type
 documentation

On Tue, Mar 03, 2020 at 12:01:12PM +0200, Tomer Maimon wrote:
> Add device tree three bootstatus reset types documentation.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> ---
>  .../bindings/watchdog/nuvoton,npcm-wdt.txt    | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/nuvoton,npcm-wdt.txt b/Documentation/devicetree/bindings/watchdog/nuvoton,npcm-wdt.txt
> index 6d593003c933..65e24a80ee70 100644
> --- a/Documentation/devicetree/bindings/watchdog/nuvoton,npcm-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/nuvoton,npcm-wdt.txt
> @@ -17,6 +17,33 @@ Required clocking property, have to be one of:
>  
>  Optional properties:
>  - timeout-sec : Contains the watchdog timeout in seconds
> +- nuvoton,card-reset-type : "porst|corst|wd0|wd1|wd2|sw1|sw2|sw3|sw4"
> +  Contains the card reset type for checking and indicating
> +  the last card reset status (WDIOF_CARDRESET)
> +
> +  If 'nuvoton,card-reset-type' is not specified the default is porst
> +
> +  Reset types:
> +       - porst: Power reset
> +       - corst: Core reset
> +	   - wdX : Watchdog reset X (X represante 0-2)
> +	   - swX : Software reset X (X represante 1-4)
> +
> +- nuvoton,ext1-reset-type : "porst|corst|wd0|wd1|wd2|sw1|sw2|sw3|sw4"
> +  Contains the external 2 reset type for checking and indicating
> +  the last external 2 reset status (WDIOF_EXTERN1)
> +
> +  If 'nuvoton,card-reset-type' is not specified the default is wd0.
> +
> +  Reset types are the same as in nuvoton,card-reset-type property.
> +
> +- nuvoton,ext2-reset-type : "porst|corst|wd0|wd1|wd2|sw1|sw2|sw3|sw4"
> +  Contains the external 2 reset type for checking and indicating
> +  the last external 2 reset status (WDIOF_EXTERN2)
> +
> +  If 'nuvoton,card-reset-type' is not specified the default is sw1.
> +
> +  Reset types are the same as in nuvoton,card-reset-type property.
>  
>  Example:
>  
> @@ -25,4 +52,7 @@ timer@...0801c {
>      interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
>      reg = <0xf000801c 0x4>;
>      clocks = <&clk NPCM7XX_CLK_TIMER>;
> +	nuvoton,card-reset-type = "porst";
> +	nuvoton,ext1-reset-type = "wd1";
> +	nuvoton,ext2-reset-type = "sw2";

This set of properties maps chip reset types to reset types defined
by the Linux watchdog subsystem (ie WDIOF_CARDRESET, WDIOF_EXTERN1,
and WDIOF_EXTERN2). It is neither a hardware description nor a system
configuration.

It is up to Rob to decide, but I personally don't think it is appropriate.

Guenter