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Date: Mon, 19 Jun 2023 23:53:43 +0200
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
conor+dt@...nel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v3 3/4] dt-bindings: power: reset: atmel,sama5d2-shdwc:
convert to yaml
Hi,
On Fri, Jun 16, 2023 at 01:16:45PM +0300, Claudiu Beznea wrote:
> Convert Microchip AT91 SAMA5D2 shutdown controller to YAML. SAMA7G5 SHDWC
> DT node (available in arch/arm/boot/dts/sama7g5.dtsi) has syscon along with
> its compatible. There is no usage of this syscon in the current code but it
> may be necessary in future as some registers of SHDWC are accessed in
> different drivers (at91-sama5d2_shdwc.c and arch/arm/mach-at91/pm.c).
> Thus update the YAML with it to make DT checkers happy.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
> ---
Thanks, queued.
-- Sebastian
> .../devicetree/bindings/arm/atmel-sysregs.txt | 63 ----------
> .../power/reset/atmel,sama5d2-shdwc.yaml | 114 ++++++++++++++++++
> 2 files changed, 114 insertions(+), 63 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
>
> diff --git a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> index e6b2fb291b45..67a66bf74895 100644
> --- a/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> +++ b/Documentation/devicetree/bindings/arm/atmel-sysregs.txt
> @@ -52,69 +52,6 @@ Example:
> reg = <0xe3804000 0x1000>;
> };
>
> -SHDWC SAMA5D2-Compatible Shutdown Controller
> -
> -1) shdwc node
> -
> -required properties:
> -- compatible: should be "atmel,sama5d2-shdwc", "microchip,sam9x60-shdwc" or
> - "microchip,sama7g5-shdwc"
> -- reg: should contain registers location and length
> -- clocks: phandle to input clock.
> -- #address-cells: should be one. The cell is the wake-up input index.
> -- #size-cells: should be zero.
> -
> -optional properties:
> -
> -- debounce-delay-us: minimum wake-up inputs debouncer period in
> - microseconds. It's usually a board-related property.
> -- atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
> -
> -optional microchip,sam9x60-shdwc or microchip,sama7g5-shdwc properties:
> -- atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
> -
> -The node contains child nodes for each wake-up input that the platform uses.
> -
> -2) input nodes
> -
> -Wake-up input nodes are usually described in the "board" part of the Device
> -Tree. Note also that input 0 is linked to the wake-up pin and is frequently
> -used.
> -
> -Required properties:
> -- reg: should contain the wake-up input index [0 - 15].
> -
> -Optional properties:
> -- atmel,wakeup-active-high: boolean, the corresponding wake-up input described
> - by the child, forces the wake-up of the core power supply on a high level.
> - The default is to be active low.
> -
> -Example:
> -
> -On the SoC side:
> - shdwc@...48010 {
> - compatible = "atmel,sama5d2-shdwc";
> - reg = <0xf8048010 0x10>;
> - clocks = <&clk32k>;
> - #address-cells = <1>;
> - #size-cells = <0>;
> - atmel,wakeup-rtc-timer;
> - };
> -
> -On the board side:
> - shdwc@...48010 {
> - debounce-delay-us = <976>;
> -
> - input@0 {
> - reg = <0>;
> - };
> -
> - input@1 {
> - reg = <1>;
> - atmel,wakeup-active-high;
> - };
> - };
> -
> Special Function Registers (SFR)
>
> Special Function Registers (SFR) manage specific aspects of the integrated
> diff --git a/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml b/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
> new file mode 100644
> index 000000000000..8c58e12cdb60
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
> @@ -0,0 +1,114 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/reset/atmel,sama5d2-shdwc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip AT91 SAMA5D2 SHDWC Shutdown Controller
> +
> +maintainers:
> + - Claudiu Beznea <claudiu.beznea@...rochip.com>
> +
> +description: |
> + Microchip AT91 SHDWC shutdown controller controls the power supplies VDDIO
> + and VDDCORE and the wake-up detection on debounced input lines.
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - const: microchip,sama7g5-shdwc
> + - const: syscon
> + - enum:
> + - atmel,sama5d2-shdwc
> + - microchip,sam9x60-shdwc
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + debounce-delay-us:
> + description:
> + Minimum wake-up inputs debouncer period in microseconds. It is usually a
> + board-related property.
> +
> + atmel,wakeup-rtc-timer:
> + description: enable real-time clock wake-up
> + type: boolean
> +
> + atmel,wakeup-rtt-timer:
> + description: enable real-time timer wake-up
> + type: boolean
> +
> +patternProperties:
> + "^input@[0-15]$":
> + description:
> + Wake-up input nodes. These are usually described in the "board" part of
> + the Device Tree. Note also that input 0 is linked to the wake-up pin and
> + is frequently used.
> + type: object
> + properties:
> + reg:
> + description: contains the wake-up input index
> + minimum: 0
> + maximum: 15
> +
> + atmel,wakeup-active-high:
> + description:
> + The corresponding wake-up input described by the child forces the
> + wake-up of the core power supply on a high level. The default is to
> + be active low.
> + type: boolean
> +
> + required:
> + - reg
> +
> + additionalProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - clocks
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: atmel,sama5d2-shdwc
> + then:
> + properties:
> + atmel,wakeup-rtt-timer: false
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + shdwc: poweroff@...48010 {
> + compatible = "atmel,sama5d2-shdwc";
> + reg = <0xf8048010 0x10>;
> + clocks = <&clk32k>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + atmel,wakeup-rtc-timer;
> + debounce-delay-us = <976>;
> +
> + input@0 {
> + reg = <0>;
> + };
> +
> + input@1 {
> + reg = <1>;
> + atmel,wakeup-active-high;
> + };
> + };
> +
> +...
> --
> 2.34.1
>
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