linux-kernel - Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

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Message-ID: <20180306124002.GA13950@amd>
Date:   Tue, 6 Mar 2018 13:40:02 +0100
From:   Pavel Machek <pavel@....cz>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc:     joel@....id.au, andrew@...id.au, arnd@...db.de,
        gregkh@...uxfoundation.org, jdelvare@...e.com, linux@...ck-us.net,
        benh@...nel.crashing.org, andrew@...n.ch,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v2 2/8] [PATCH 2/8] Documentations: dt-bindings: Add a
 document of PECI adapter driver for Aspeed AST24xx/25xx SoCs

Hi!

> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> ---
>  .../devicetree/bindings/peci/peci-aspeed.txt       | 73 ++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt
> 
> diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> new file mode 100644
> index 000000000000..8a86f346d550
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> @@ -0,0 +1,73 @@
> +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.

Are these SoCs x86-based?

> +Required properties:
> +- compatible
> +	"aspeed,ast2400-peci" or "aspeed,ast2500-peci"
> +	- aspeed,ast2400-peci: Aspeed AST2400 family PECI controller
> +	- aspeed,ast2500-peci: Aspeed AST2500 family PECI controller
> +
> +- reg
> +	Should contain PECI registers location and length.

Other dts documents put it on one line, reg: Should contain ...

> +- clock_frequency
> +	Should contain the operation frequency of PECI hardware module.
> +	187500 ~ 24000000

specify this is Hz?

> +- rd-sampling-point
> +	Read sampling point selection. The whole period of a bit time will be
> +	divided into 16 time frames. This value will determine which time frame
> +	this controller will sample PECI signal for data read back. Usually in
> +	the middle of a bit time is the best.

English? "This value will determine when this controller"?

> +	0 ~ 15 (default: 8)
> +
> +- cmd_timeout_ms
> +	Command timeout in units of ms.
> +	1 ~ 60000 (default: 1000)
> +
> +Example:
> +	peci: peci@...8b000 {
> +		compatible = "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0x0 0x1e78b000 0x60>;
> +
> +		peci0: peci-bus@0 {
> +			compatible = "aspeed,ast2500-peci";
> +			reg = <0x0 0x60>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			interrupts = <15>;
> +			clocks = <&clk_clkin>;
> +			clock-frequency = <24000000>;
> +			msg-timing-nego = <1>;
> +			addr-timing-nego = <1>;
> +			rd-sampling-point = <8>;
> +			cmd-timeout-ms = <1000>;
> +		};
> +	};
> \ No newline at end of file

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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