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Date: Tue, 26 Oct 2021 13:25:56 -0500
From: Rob Herring <robh@...nel.org>
To: Hector Martin <marcan@...can.st>
Cc: linux-arm-kernel@...ts.infradead.org,
Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Krzysztof Kozlowski <krzk@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mark Kettenis <mark.kettenis@...all.nl>,
Philipp Zabel <p.zabel@...gutronix.de>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Johan Hovold <johan@...nel.org>, devicetree@...r.kernel.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
Mark Kettenis <kettenis@...nbsd.org>
Subject: Re: [PATCH v2 2/8] dt-bindings: arm: apple: Add apple,pmgr binding
On Mon, Oct 25, 2021 at 11:47:12PM +0900, Hector Martin wrote:
> The PMGR block in Apple Silicon SoCs is responsible for SoC power
> management. There are two PMGRs in T8103, with different register
> layouts but compatible registers. In order to support this as well
> as future SoC generations with backwards-compatible registers, we
> declare these blocks as syscons and bind to individual registers
> in child nodes. Each register controls one SoC device.
>
> The respective apple compatibles are defined in case device-specific
> quirks are necessary in the future, but currently these nodes are
> expected to be bound by the generic syscon driver.
>
> Reviewed-by: Mark Kettenis <kettenis@...nbsd.org>
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
> .../bindings/arm/apple/apple,pmgr.yaml | 149 ++++++++++++++++++
> 1 file changed, 149 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml
>
> diff --git a/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml b/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml
> new file mode 100644
> index 000000000000..e8b7776163fc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml
> @@ -0,0 +1,149 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/apple/apple,pmgr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple SoC Power Manager (PMGR)
> +
> +maintainers:
> + - Hector Martin <marcan@...can.st>
> +
> +description: |
> + Apple SoCs include a PMGR block responsible for power management,
> + which can control various clocks, resets, power states, and
> + performance features. This node represents the PMGR as a syscon,
> + with sub-nodes representing individual features.
> +
> + Apple SoCs may have a secondary "mini-PMGR"; it is represented
> + separately in the device tree, but works the same way.
> +
> +select:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - apple,t8103-pmgr
> + - apple,t8103-minipmgr
> + - apple,pmgr
You shouldn't need this. The default select will filter out syscon and
simple-mfd.
> +
> + required:
> + - compatible
> +
> +properties:
> + $nodename:
> + pattern: "^power-management@[0-9a-f]+$"
> +
> + compatible:
> + items:
> + - enum:
> + - apple,t8103-pmgr
> + - apple,t8103-minipmgr
> + - const: apple,pmgr
> + - const: syscon
> + - const: simple-mfd
'simple-mfd' means 'there's nothing in this node that any of the child
nodes depend on'. You should be somewhat certain as dropping it later
creates compatibility issues.
> +
> + reg:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 1
> +
> +patternProperties:
> + "power-controller@[0-9a-f]+$":
> + description: |
Don't need '|' if no formatting to preserve.
> + The individual power management domains within this controller
> + type: object
> + $ref: /power/apple,pmgr-pwrstate.yaml#
> +
> +required:
> + - compatible
> + - reg
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + soc {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + power-management@...700000 {
> + compatible = "apple,t8103-pmgr", "apple,pmgr", "syscon", "simple-mfd";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <0x2 0x3b700000 0x0 0x14000>;
> +
> + ps_sio: power-controller@1c0 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x1c0 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "sio";
> + apple,always-on;
> + };
> +
> + ps_uart_p: power-controller@220 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x220 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "uart_p";
> + power-domains = <&ps_sio>;
> + };
> +
> + ps_uart0: power-controller@270 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x270 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "uart0";
> + power-domains = <&ps_uart_p>;
> + };
> + };
> +
> + power-management@...280000 {
> + compatible = "apple,t8103-minipmgr", "apple,pmgr", "syscon", "simple-mfd";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <0x2 0x3d280000 0x0 0xc000>;
> +
> + ps_aop_filter: power-controller@...0 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x4000 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "aop_filter";
> + };
> +
> + ps_aop_base: power-controller@...0 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x4010 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "aop_base";
> + power-domains = <&ps_aop_filter>;
> + };
> +
> + ps_aop_shim: power-controller@...8 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x4038 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "aop_shim";
> + power-domains = <&ps_aop_base>;
> + };
> +
> + ps_aop_uart0: power-controller@...8 {
> + compatible = "apple,t8103-pmgr-pwrstate", "apple,pmgr-pwrstate";
> + reg = <0x4048 8>;
> + #power-domain-cells = <0>;
> + #reset-cells = <0>;
> + label = "aop_uart0";
> + power-domains = <&ps_aop_shim>;
> + };
> + };
> + };
> --
> 2.33.0
>
>
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