linux-kernel - Re: [PATCH V2 1/5] dt-bindings: fsl: scu: add scu power key binding

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Message-ID: <21d2e400-976a-35c3-6875-4cc0c476fdf2@pengutronix.de>
Date:   Tue, 3 Sep 2019 08:32:15 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Anson Huang <Anson.Huang@....com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, catalin.marinas@....com,
        will@...nel.org, dmitry.torokhov@...il.com, aisheng.dong@....com,
        ulf.hansson@...aro.org, fugang.duan@....com, peng.fan@....com,
        daniel.baluta@....com, leonard.crestez@....com, mripard@...nel.org,
        olof@...om.net, arnd@...db.de, jagan@...rulasolutions.com,
        bjorn.andersson@...aro.org, dinguyen@...nel.org,
        marcin.juszkiewicz@...aro.org, stefan@...er.ch,
        gregkh@...uxfoundation.org, andriy.shevchenko@...ux.intel.com,
        yuehaibing@...wei.com, tglx@...utronix.de, ronald@...ovation.ch,
        m.felsch@...gutronix.de, ping.bai@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org
Cc:     Linux-imx@....com
Subject: Re: [PATCH V2 1/5] dt-bindings: fsl: scu: add scu power key binding



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@....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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