linux-kernel - Re: [PATCH v9 07/12] dt-bindings: mfd: Add a document for PECI client MFD

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Date:   Fri, 21 Dec 2018 14:47:54 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Mark Rutland <mark.rutland@....com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, Wu Hao <hao.wu@...el.com>,
        Tomohiro Kusumi <kusumi.tomohiro@...il.com>,
        "Bryant G . Ly" <bryantly@...ux.vnet.ibm.com>,
        Frederic Barrat <fbarrat@...ux.vnet.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Vinod Koul <vkoul@...nel.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        David Kershner <david.kershner@...sys.com>,
        Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>,
        Sagar Dharia <sdharia@...eaurora.org>,
        Johan Hovold <johan@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        openbmc@...ts.ozlabs.org,
        James Feist <james.feist@...ux.intel.com>,
        Jason M Biils <jason.m.bills@...ux.intel.com>,
        Vernon Mauery <vernon.mauery@...ux.intel.com>
Subject: Re: [PATCH v9 07/12] dt-bindings: mfd: Add a document for PECI
 client MFD

On Tue, 18 Dec 2018, Jae Hyun Yoo wrote:

> This commit adds a dt-bindings document for PECI client MFD.
> 
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Andrew Jeffery <andrew@...id.au>
> Cc: James Feist <james.feist@...ux.intel.com>
> Cc: Jason M Biils <jason.m.bills@...ux.intel.com>
> Cc: Joel Stanley <joel@....id.au>
> Cc: Vernon Mauery <vernon.mauery@...ux.intel.com>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../bindings/mfd/intel-peci-client.txt        | 34 +++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/intel-peci-client.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/intel-peci-client.txt b/Documentation/devicetree/bindings/mfd/intel-peci-client.txt
> new file mode 100644
> index 000000000000..5d1d5d0a552f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/intel-peci-client.txt
> @@ -0,0 +1,34 @@
> +* Intel PECI client bindings
> +
> +PECI (Platform Environment Control Interface) is a one-wire bus interface that
> +provides a communication channel from PECI clients in Intel processors and
> +chipset components to external monitoring or control devices. PECI is designed
> +to support the following sideband functions:
> +
> +- Processor and DRAM thermal management
> +- Platform Manageability
> +- Processor Interface Tuning and Diagnostics
> +- Failure Analysis
> +
> +Required properties:
> +- compatible : Should be "intel,peci-client".
> +- reg        : Should contain address of a client CPU. According to the PECI
> +	       specification, client addresses start from 0x30.
> +
> +Example:
> +	peci-bus@0 {
> +		compatible = "vendor,soc-peci";
> +		reg = <0x0 0x1000>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		peci-client@30 {
> +			compatible = "intel,peci-client";
> +			reg = <0x30>;
> +		};
> +
> +		peci-client@31 {
> +			compatible = "intel,peci-client";
> +			reg = <0x31>;
> +		};

The PECI Client driver (masquerading as an MFD driver in this set)
doesn't actually do anything special.  Instead of detailing it here,
register the child devices directly instead.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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