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Subject: Re: [PATCH V2 1/5] dt-bindings: fsl: scu: add scu power key binding
To:     Anson Huang <Anson.Huang@nxp.com>, robh+dt@kernel.org,
        mark.rutland@arm.com, shawnguo@kernel.org, s.hauer@pengutronix.de,
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        marcin.juszkiewicz@linaro.org, stefan@agner.ch,
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        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org
Cc:     Linux-imx@nxp.com
References: <1567519424-32271-1-git-send-email-Anson.Huang@nxp.com>
From:   Oleksij Rempel <o.rempel@pengutronix.de>
Message-ID: <21d2e400-976a-35c3-6875-4cc0c476fdf2@pengutronix.de>
Date:   Tue, 3 Sep 2019 08:32:15 +0200
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On 03.09.19 16:03, Anson Huang wrote:
> NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
> system controller, the system controller is in charge of system
> power, clock and power key event etc. management, Linux kernel
> has to communicate with system controller via MU (message unit)
> IPC to get power key event, add binding doc for i.MX system
> controller power key driver.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> Changes since V1:
> 	- remove "wakeup-source" property, as it is NOT needed for SCU interrupt;
> 	- remove "status" in example.
> ---
>   .../devicetree/bindings/arm/freescale/fsl,scu.txt          | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> index c149fad..f93e2e4 100644
> --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> @@ -157,6 +157,15 @@ Required properties:
>   Optional properties:
>   - timeout-sec: contains the watchdog timeout in seconds.
>   
> +Power key bindings based on SCU Message Protocol
> +------------------------------------------------------------
> +
> +Required properties:
> +- compatible: should be:
> +              "fsl,imx8qxp-sc-pwrkey"
> +              followed by "fsl,imx-sc-pwrkey";
> +- linux,keycodes: See Documentation/devicetree/bindings/input/keys.txt

linux,keycodes is required parameter. So, this kay cab be anything. Why the compatible is 
called pwrkey? Probably it is better to call it "*-sc-key"

> +
>   Example (imx8qxp):
>   -------------
>   aliases {
> @@ -220,6 +229,11 @@ firmware {
>   			compatible = "fsl,imx8qxp-sc-rtc";
>   		};
>   
> +		scu_pwrkey: scu-pwrkey {
> +			compatible = "fsl,imx8qxp-sc-pwrkey", "fsl,imx-sc-pwrkey";
> +			linux,keycode = <KEY_POWER>;
> +		};
> +
>   		watchdog {
>   			compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
>   			timeout-sec = <60>;
> 

Kind regards,
Oleksij Rempel

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