linux-kernel - Re: [PATCH 3/4] watchdog: st_wdt: Provide binding documentation for ST's LPC Watchdog driver

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Date:	Thu, 9 Oct 2014 10:56:49 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	"wim@...ana.be" <wim@...ana.be>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	David Paris <david.paris@...com>
Subject: Re: [PATCH 3/4] watchdog: st_wdt: Provide binding documentation for
 ST's LPC Watchdog driver

On Wed, Oct 08, 2014 at 10:33:29AM +0100, Lee Jones wrote:
> Cc: devicetree@...r.kernel.org
> Signed-off-by: David Paris <david.paris@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  .../devicetree/bindings/watchdog/st-lpc-wdt.txt    | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/st-lpc-wdt.txt
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/st-lpc-wdt.txt b/Documentation/devicetree/bindings/watchdog/st-lpc-wdt.txt
> new file mode 100644
> index 0000000..520ce90
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/st-lpc-wdt.txt
> @@ -0,0 +1,30 @@
> +STMicroelectronics LPC Watchdog
> +===============================
> +
> +Required properties
> +
> +- compatible 	: Must be one of:
> +			"st,stih407-watchdog"
> +			"st,stih416-watchdog"
> +			"st,stih415-watchdog"
> +			"st,stid127-watchdog"
> +- reg		: LPC registers base address + range

s/range/size/

Please append something like "one entryfor each entry in reg-names".

> +- reg-names	: Register map "base" and "syscfg-en" are compulsory. "type" is
> +		  platform dependent and not required for the STiH407

I don't understand the mention of "type".

Additionally, "syscfg-en" looks to be a portion of another device
(shared system controller?), and probably should be described by
reference.

> +- clock-names 	: Should be "lpc_wdt"
> +- clocks	: Clock used by LPC device
> +- timeout-sec	: Watchdog timeout in seconds
> +- st,syscfg	: Syscfg node used to configure CPU reset type and mask

Does this relate to the syscfg-en entry in the reg proeprty?

> +- st,warm_reset	: If present, reset type will be 'warm'. If not, it will be cold

s/_/-/ in property names.

Why does this need to be in the binding? It seems like a choice rather
than a property of the system.

Mark.

> +
> +Example:
> +	watchdog@...05000 {
> +		compatible	= "st,stih416-lpc-watchdog";
> +		reg		= <0xfde05000 0x1000> <0x204 0x4>;
> +		reg-names	= "base", "syscfg-en"
> +		clock-names	= "lpc_wdt";
> +		clocks 		= <&clk_s_d3_flexgen CLK_LPC_0>;
> +		timeout-sec	= <600>;
> +		st,syscfg	= <&syscfg_core>;
> +		st,warm_reset;
> +	};
> -- 
> 1.9.1
> 
> --
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