linux-kernel - Re: [PATCH 1/3] dt-bindings: watchdog: sam9x60

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Date:   Wed, 2 Oct 2019 11:56:51 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Eugen.Hristev@...rochip.com
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net, robh+dt@...nel.org,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Nicolas.Ferre@...rochip.com
Subject: Re: [PATCH 1/3] dt-bindings: watchdog: sam9x60_wdt: add bindings

On 02/10/2019 07:35:23+0000, Eugen.Hristev@...rochip.com wrote:
> From: Eugen Hristev <eugen.hristev@...rochip.com>
> 
> Add bindings for Microchip SAM9X60 Watchdog Timer
> 
> It has the same bindings as
> Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt
> except the compatible.
> 

Maybe it can then use the same documentation file. However, I think you
should already use the yaml dt bindings schema instead of a simple text
file.

> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> ---
>  .../devicetree/bindings/watchdog/sam9x60-wdt.txt   | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/sam9x60-wdt.txt
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/sam9x60-wdt.txt b/Documentation/devicetree/bindings/watchdog/sam9x60-wdt.txt
> new file mode 100644
> index 00000000..74b4e2d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/sam9x60-wdt.txt
> @@ -0,0 +1,34 @@
> +* Microchip SAM9X60 Watchdog Timer (WDT) Controller
> +
> +Required properties:
> +- compatible: "microchip,sam9x60-wdt"
> +- reg: base physical address and length of memory mapped region.
> +
> +Optional properties:
> +- timeout-sec: watchdog timeout value (in seconds).
> +- interrupts: interrupt number to the CPU.
> +- atmel,watchdog-type: should be "hardware" or "software".
> +	"hardware": enable watchdog fault reset. A watchdog fault triggers
> +		    watchdog reset.
> +	"software": enable watchdog fault interrupt. A watchdog fault asserts
> +		    watchdog interrupt.
> +- atmel,idle-halt: present if you want to stop the watchdog when the CPU is
> +		   in 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: present if you want to stop the watchdog when the CPU is
> +		  in debug state.
> +
> +Example:
> +	watchdog@...fff80 {
> +		compatible = "microchip,sam9x60-wdt";
> +		reg = <0xffffff80 0x24>;
> +		interrupts = <1 IRQ_TYPE_LEVEL_HIGH 5>;
> +		timeout-sec = <10>;
> +		atmel,watchdog-type = "hardware";
> +		atmel,dbg-halt;
> +		atmel,idle-halt;
> +	};
> -- 
> 2.7.4
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com