On Wed, May 04, 2022 at 03:02:28PM +0200, Valentin Caron wrote:
> From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
>
> STM32 RTC has three output pins: RTC_OUT1, RTC_OUT2 or RTC_OUT2_RMP.
>
> RTC Low-Speed Clock Output (LSCO) can be output on RTC_OUT1 or
> RTC_OUT2_RMP.
>
> This patch adds constants for RTC output bindings and adds st,lsco
> optional property for stm32 rtc driver, to select and enable LSCO.
> A pinctrl state is also optional to reserve pin for RTC output.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
> Signed-off-by: Valentin Caron <valentin.caron@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/rtc/st,stm32-rtc.yaml | 20 +++++++++++++++++++
> include/dt-bindings/rtc/rtc-stm32.h | 14 +++++++++++++
> 2 files changed, 34 insertions(+)
> create mode 100644 include/dt-bindings/rtc/rtc-stm32.h
>
> diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> index 764717ce1873..56d46ea35c5d 100644
> --- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> @@ -52,6 +52,13 @@ properties:
> override default rtc_ck parent clock phandle of the new parent clock of rtc_ck
> maxItems: 1
>
> + st,lsco:
> + $ref: "/schemas/types.yaml#/definitions/uint32"
> + description: |
> + To select and enable RTC Low Speed Clock Output.
> + Refer to <include/dt-bindings/rtc/rtc-stm32.h> for the supported values.
> + Pinctrl state named "default" may be defined to reserve pin for RTC output.
> +
> allOf:
> - if:
> properties:
> @@ -65,6 +72,9 @@ allOf:
> minItems: 1
> maxItems: 1
>
> + st,lsco:
> + maxItems: 0
If disallowing the property is what you wanted, then 'st,lsco: false' is
the way. 'maxItems: 0' is never correct.
> +
> clock-names: false
>
> required:
> @@ -82,6 +92,9 @@ allOf:
> minItems: 2
> maxItems: 2
>
> + st,lsco:
> + maxItems: 0
> +
> required:
> - clock-names
> - st,syscfg
> @@ -101,6 +114,9 @@ allOf:
> assigned-clocks: false
> assigned-clock-parents: false
>
> + st,lsco:
> + maxItems: 1
> +
> required:
> - clock-names
>
> @@ -130,12 +146,16 @@ examples:
> - |
> #include <dt-bindings/interrupt-controller/arm-gic.h>
> #include <dt-bindings/clock/stm32mp1-clks.h>
> + #include <dt-bindings/rtc/rtc-stm32.h>
> rtc@5c004000 {
> compatible = "st,stm32mp1-rtc";
> reg = <0x5c004000 0x400>;
> clocks = <&rcc RTCAPB>, <&rcc RTC>;
> clock-names = "pclk", "rtc_ck";
> interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
> + st,lsco = <RTC_OUT2_RMP>;
> + pinctrl-0 = <&rtc_out2_rmp_pins_a>;
> + pinctrl-names = "default";
> };
>
> ...
> diff --git a/include/dt-bindings/rtc/rtc-stm32.h b/include/dt-bindings/rtc/rtc-stm32.h
> new file mode 100644
> index 000000000000..2fd78c2e62d4
> --- /dev/null
> +++ b/include/dt-bindings/rtc/rtc-stm32.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * This header provides constants for STM32_RTC bindings.
> + */
> +
> +#ifndef _DT_BINDINGS_RTC_RTC_STM32_H
> +#define _DT_BINDINGS_RTC_RTC_STM32_H
> +
> +#define RTC_NO_OUT 0
> +#define RTC_OUT1 1
> +#define RTC_OUT2 2
> +#define RTC_OUT2_RMP 3
> +
> +#endif
> --
> 2.25.1
>
>
