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SubjectRe: [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@nxp.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@nxp.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@1e34040 {
> + 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@2800000 {
> + 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
>

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