linux-kernel - Re: [v5,2/2] Documentation: dt: binding: rtc: add binding for ftm alarm driver

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Message-ID: <CAL_Jsq+U=W_51qUDvOMPgexMOLuqTyYua5H6G-cwFnKCh8YmPg@mail.gmail.com>
Date:   Tue, 16 Jul 2019 16:32:01 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Biwen Li <biwen.li@....com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Yang-Leo Li <leoyang.li@....com>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Xiaobo Xie <xiaobo.xie@....com>,
        Jiafei Pan <jiafei.pan@....com>, Ran Wang <ran.wang_1@....com>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [v5,2/2] Documentation: dt: binding: rtc: add binding for ftm
 alarm driver

On Tue, Jul 16, 2019 at 4:26 AM Biwen Li <biwen.li@....com> wrote:
>
> The patch adds binding for ftm alarm driver

Bindings are for h/w, not drivers...

'dt-bindings: rtc: ...' for the subject prefix.

>
> Signed-off-by: Biwen Li <biwen.li@....com>
> ---
> Change in v5:
>     - None
>
> Change in v4:
>     - add note about dts and kernel options
>     - add aliases in example
>
> Change in v3:
>         - remove reg-names property
>         - correct cells number
>
> Change in v2:
>         - replace ls1043a with ls1088a as example
>         - add rcpm node and fsl,rcpm-wakeup property
>
>
>  .../bindings/rtc/rtc-fsl-ftm-alarm.txt        | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
>
> diff --git a/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
> new file mode 100644
> index 000000000000..fb018065406c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
> @@ -0,0 +1,49 @@
> +Freescale FlexTimer Module (FTM) Alarm
> +
> +Note:
> +- The driver depends on RCPM driver
> +  to wake up system in sleep.
> +- Need stop using RTC_HCTOSYS or use the DT aliases
> +  to ensure the driver is not used as the primary RTC.
> +  (Select DT aliases defaultly)

This is Linux specific and not relevant to the binding.

> +
> +Required properties:
> +- compatible : Should be "fsl,<chip>-ftm-alarm", the
> +              supported chips include
> +              "fsl,ls1012a-ftm-alarm"
> +              "fsl,ls1021a-ftm-alarm"
> +              "fsl,ls1028a-ftm-alarm"
> +              "fsl,ls1043a-ftm-alarm"
> +              "fsl,ls1046a-ftm-alarm"
> +              "fsl,ls1088a-ftm-alarm"
> +              "fsl,ls208xa-ftm-alarm"
> +- reg : Specifies base physical address and size of the register sets for the
> +  FlexTimer Module and base physical address of IP Powerdown Exception Control
> +  Register.
> +- interrupts : Should be the FlexTimer Module interrupt.
> +- fsl,rcpm-wakeup property and rcpm node : Please refer
> +       Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> +
> +Optional properties:
> +- big-endian: If the host controller is big-endian mode, specify this property.
> +  The default endian mode is little-endian.
> +
> +Example:
> +aliases {
> +       ...
> +       rtc1 = ftm_alarm0; /* Use flextimer alarm driver as /dev/rtc1 */
> +       ...
> +};

Drop the aliases part. It's not going to work when this is converted
to DT schema and the comment is Linux specific.

> +
> +rcpm: rcpm@...4040 {
> +       compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+";
> +       reg = <0x0 0x1e34040 0x0 0x18>;
> +       fsl,#rcpm-wakeup-cells = <6>;

Before there are any users of this, either drop it if it is not
variable or the correct form would be '#fsl,rcpm-wakeup-cells'.

> +};
> +
> +ftm_alarm0: timer@...0000 {
> +       compatible = "fsl,ls1088a-ftm-alarm";
> +       reg = <0x0 0x2800000 0x0 0x10000>;
> +       fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
> +       interrupts = <0 44 4>;
> +};
> --
> 2.17.1
>