+++ /dev/null
-System Control and Management Interface (SCMI) Message Protocol
-----------------------------------------------------------
-
-The SCMI is intended to allow agents such as OSPM to manage various functions
-that are provided by the hardware platform it is running on, including power
-and performance functions.
-
-This binding is intended to define the interface the firmware implementing
-the SCMI as described in ARM document number ARM DEN 0056A ("ARM System Control
-and Management Interface Platform Design Document")[0] provide for OSPM in
-the device tree.
-
-Required properties:
-
-The scmi node with the following properties shall be under the /firmware/ node.
-
-- compatible : shall be "arm,scmi" or "arm,scmi-smc" for smc/hvc transports
-- mboxes: List of phandle and mailbox channel specifiers. It should contain
- exactly one or two mailboxes, one for transmitting messages("tx")
- and another optional for receiving the notifications("rx") if
- supported.
-- shmem : List of phandle pointing to the shared memory(SHM) area as per
- generic mailbox client binding.
-- #address-cells : should be '1' if the device has sub-nodes, maps to
- protocol identifier for a given sub-node.
-- #size-cells : should be '0' as 'reg' property doesn't have any size
- associated with it.
-- arm,smc-id : SMC id required when using smc or hvc transports
-
-Optional properties:
-
-- mbox-names: shall be "tx" or "rx" depending on mboxes entries.
-
-- interrupts : when using smc or hvc transports, this optional
- property indicates that msg completion by the platform is indicated
- by an interrupt rather than by the return of the smc call. This
- should not be used except when the platform requires such behavior.
-
-- interrupt-names : if "interrupts" is present, interrupt-names must also
- be present and have the value "a2p".
-
-See Documentation/devicetree/bindings/mailbox/mailbox.txt for more details
-about the generic mailbox controller and client driver bindings.
-
-The mailbox is the only permitted method of calling the SCMI firmware.
-Mailbox doorbell is used as a mechanism to alert the presence of a
-messages and/or notification.
-
-Each protocol supported shall have a sub-node with corresponding compatible
-as described in the following sections. If the platform supports dedicated
-communication channel for a particular protocol, the 3 properties namely:
-mboxes, mbox-names and shmem shall be present in the sub-node corresponding
-to that protocol.
-
-Clock/Performance bindings for the clocks/OPPs based on SCMI Message Protocol
-------------------------------------------------------------
-
-This binding uses the common clock binding[1].
-
-Required properties:
-- #clock-cells : Should be 1. Contains the Clock ID value used by SCMI commands.
-
-Power domain bindings for the power domains based on SCMI Message Protocol
-------------------------------------------------------------
-
-This binding for the SCMI power domain providers uses the generic power
-domain binding[2].
-
-Required properties:
- - #power-domain-cells : Should be 1. Contains the device or the power
- domain ID value used by SCMI commands.
-
-Regulator bindings for the SCMI Regulator based on SCMI Message Protocol
-------------------------------------------------------------
-An SCMI Regulator is permanently bound to a well defined SCMI Voltage Domain,
-and should be always positioned as a root regulator.
-It does not support any current operation.
-
-SCMI Regulators are grouped under a 'regulators' node which in turn is a child
-of the SCMI Voltage protocol node inside the desired SCMI instance node.
-
-This binding uses the common regulator binding[6].
-
-Required properties:
- - reg : shall identify an existent SCMI Voltage Domain.
-
-Sensor bindings for the sensors based on SCMI Message Protocol
---------------------------------------------------------------
-SCMI provides an API to access the various sensors on the SoC.
-
-Required properties:
-- #thermal-sensor-cells: should be set to 1. This property follows the
- thermal device tree bindings[3].
-
- Valid cell values are raw identifiers (Sensor ID)
- as used by the firmware. Refer to platform details
- for your implementation for the IDs to use.
-
-Reset signal bindings for the reset domains based on SCMI Message Protocol
-------------------------------------------------------------
-
-This binding for the SCMI reset domain providers uses the generic reset
-signal binding[5].
-
-Required properties:
- - #reset-cells : Should be 1. Contains the reset domain ID value used
- by SCMI commands.
-
-[0] http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/index.html
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-[2] Documentation/devicetree/bindings/power/power-domain.yaml
-[3] Documentation/devicetree/bindings/thermal/thermal*.yaml
-[4] Documentation/devicetree/bindings/sram/sram.yaml
-[5] Documentation/devicetree/bindings/reset/reset.txt
-[6] Documentation/devicetree/bindings/regulator/regulator.yaml
-
-Example:
-
-sram@50000000 {
- compatible = "mmio-sram";
- reg = <0x0 0x50000000 0x0 0x10000>;
-
- #address-cells = <1>;
- #size-cells = <1>;
- ranges = <0 0x0 0x50000000 0x10000>;
-
- cpu_scp_lpri: scp-shmem@0 {
- compatible = "arm,scmi-shmem";
- reg = <0x0 0x200>;
- };
-
- cpu_scp_hpri: scp-shmem@200 {
- compatible = "arm,scmi-shmem";
- reg = <0x200 0x200>;
- };
-};
-
-mailbox@40000000 {
- ....
- #mbox-cells = <1>;
- reg = <0x0 0x40000000 0x0 0x10000>;
-};
-
-firmware {
-
- ...
-
- scmi {
- compatible = "arm,scmi";
- mboxes = <&mailbox 0 &mailbox 1>;
- mbox-names = "tx", "rx";
- shmem = <&cpu_scp_lpri &cpu_scp_hpri>;
- #address-cells = <1>;
- #size-cells = <0>;
-
- scmi_devpd: protocol@11 {
- reg = <0x11>;
- #power-domain-cells = <1>;
- };
-
- scmi_dvfs: protocol@13 {
- reg = <0x13>;
- #clock-cells = <1>;
- };
-
- scmi_clk: protocol@14 {
- reg = <0x14>;
- #clock-cells = <1>;
- };
-
- scmi_sensors0: protocol@15 {
- reg = <0x15>;
- #thermal-sensor-cells = <1>;
- };
-
- scmi_reset: protocol@16 {
- reg = <0x16>;
- #reset-cells = <1>;
- };
-
- scmi_voltage: protocol@17 {
- reg = <0x17>;
-
- regulators {
- regulator_devX: regulator@0 {
- reg = <0x0>;
- regulator-max-microvolt = <3300000>;
- };
-
- regulator_devY: regulator@9 {
- reg = <0x9>;
- regulator-min-microvolt = <500000>;
- regulator-max-microvolt = <4200000>;
- };
-
- ...
- };
- };
- };
-};
-
-cpu@0 {
- ...
- reg = <0 0>;
- clocks = <&scmi_dvfs 0>;
-};
-
-hdlcd@7ff60000 {
- ...
- reg = <0 0x7ff60000 0 0x1000>;
- clocks = <&scmi_clk 4>;
- power-domains = <&scmi_devpd 1>;
- resets = <&scmi_reset 10>;
-};
-
-thermal-zones {
- soc_thermal {
- polling-delay-passive = <100>;
- polling-delay = <1000>;
- /* sensor ID */
- thermal-sensors = <&scmi_sensors0 3>;
- ...
- };
-};
--- /dev/null
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2021 ARM Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/arm,scmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: System Control and Management Interface (SCMI) Message Protocol bindings
+
+maintainers:
+ - Sudeep Holla <sudeep.holla@arm.com>
+
+description: |
+ The SCMI is intended to allow agents such as OSPM to manage various functions
+ that are provided by the hardware platform it is running on, including power
+ and performance functions.
+
+ This binding is intended to define the interface the firmware implementing
+ the SCMI as described in ARM document number ARM DEN 0056 ("ARM System Control
+ and Management Interface Platform Design Document")[0] provide for OSPM in
+ the device tree.
+
+ [0] https://developer.arm.com/documentation/den0056/latest
+
+properties:
+ $nodename:
+ const: scmi
+
+ compatible:
+ oneOf:
+ - description: SCMI compliant firmware with mailbox transport
+ items:
+ - const: arm,scmi
+ - description: SCMI compliant firmware with ARM SMC/HVC transport
+ items:
+ - const: arm,scmi-smc
+
+ interrupts:
+ description:
+ The interrupt that indicates message completion by the platform
+ rather than by the return of the smc call. This should not be used
+ except when the platform requires such behavior.
+ maxItems: 1
+
+ interrupt-names:
+ const: a2p
+
+ mbox-names:
+ description:
+ Specifies the mailboxes used to communicate with SCMI compliant
+ firmware.
+ items:
+ - const: tx
+ - const: rx
+
+ mboxes:
+ description:
+ List of phandle and mailbox channel specifiers. It should contain
+ exactly one or two mailboxes, one for transmitting messages("tx")
+ and another optional for receiving the notifications("rx") if supported.
+ minItems: 1
+ maxItems: 2
+
+ shmem:
+ description:
+ List of phandle pointing to the shared memory(SHM) area, for each
+ transport channel specified.
+ minItems: 1
+ maxItems: 2
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ arm,smc-id:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ SMC id required when using smc or hvc transports
+
+ protocol@11:
+ type: object
+ properties:
+ reg:
+ const: 0x11
+
+ '#power-domain-cells':
+ const: 1
+
+ required:
+ - '#power-domain-cells'
+
+ protocol@13:
+ type: object
+ properties:
+ reg:
+ const: 0x13
+
+ '#clock-cells':
+ const: 1
+
+ required:
+ - '#clock-cells'
+
+ protocol@14:
+ type: object
+ properties:
+ reg:
+ const: 0x14
+
+ '#clock-cells':
+ const: 1
+
+ required:
+ - '#clock-cells'
+
+ protocol@15:
+ type: object
+ properties:
+ reg:
+ const: 0x15
+
+ '#thermal-sensor-cells':
+ const: 1
+
+ required:
+ - '#thermal-sensor-cells'
+
+ protocol@16:
+ type: object
+ properties:
+ reg:
+ const: 0x16
+
+ '#reset-cells':
+ const: 1
+
+ required:
+ - '#reset-cells'
+
+ protocol@17:
+ type: object
+ properties:
+ reg:
+ const: 0x17
+
+ regulators:
+ type: object
+ description:
+ The list of all regulators provided by this SCMI controller.
+
+ patternProperties:
+ '^regulators@[0-9a-f]+$':
+ type: object
+ $ref: "../regulator/regulator.yaml#"
+
+ properties:
+ reg:
+ maxItems: 1
+ description: Identifier for the voltage regulator.
+
+ required:
+ - reg
+
+additionalProperties: false
+
+patternProperties:
+ '^protocol@[0-9a-f]+$':
+ type: object
+ description:
+ Each sub-node represents a protocol supported. If the platform
+ supports a dedicated communication channel for a particular protocol,
+ then the corresponding transport properties must be present.
+
+ properties:
+ reg:
+ maxItems: 1
+
+ mbox-names:
+ items:
+ - const: tx
+ - const: rx
+
+ mboxes:
+ minItems: 1
+ maxItems: 2
+
+ shmem:
+ minItems: 1
+ maxItems: 2
+
+ required:
+ - reg
+
+required:
+ - compatible
+ - shmem
+
+if:
+ properties:
+ compatible:
+ contains:
+ const: arm,scmi
+then:
+ properties:
+ interrupts: false
+ interrupt-names: false
+
+ required:
+ - mboxes
+
+else:
+ if:
+ properties:
+ compatible:
+ contains:
+ const: arm,scmi-smc
+ then:
+ required:
+ - arm,smc-id
+
+examples:
+ - |
+ firmware {
+ scmi {
+ compatible = "arm,scmi";
+ mboxes = <&mhuB 0 0>,
+ <&mhuB 0 1>;
+ mbox-names = "tx", "rx";
+ shmem = <&cpu_scp_lpri0>,
+ <&cpu_scp_lpri1>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ scmi_devpd: protocol@11 {
+ reg = <0x11>;
+ #power-domain-cells = <1>;
+ };
+
+ scmi_dvfs: protocol@13 {
+ reg = <0x13>;
+ #clock-cells = <1>;
+
+ mboxes = <&mhuB 1 0>,
+ <&mhuB 1 1>;
+ mbox-names = "tx", "rx";
+ shmem = <&cpu_scp_hpri0>,
+ <&cpu_scp_hpri1>;
+ };
+
+ scmi_clk: protocol@14 {
+ reg = <0x14>;
+ #clock-cells = <1>;
+ };
+
+ scmi_sensors: protocol@15 {
+ reg = <0x15>;
+ #thermal-sensor-cells = <1>;
+ };
+
+ scmi_reset: protocol@16 {
+ reg = <0x16>;
+ #reset-cells = <1>;
+ };
+
+ scmi_voltage: protocol@17 {
+ reg = <0x17>;
+ regulators {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ regulator_devX: regulator@0 {
+ reg = <0x0>;
+ regulator-max-microvolt = <3300000>;
+ };
+
+ regulator_devY: regulator@9 {
+ reg = <0x9>;
+ regulator-min-microvolt = <500000>;
+ regulator-max-microvolt = <4200000>;
+ };
+ };
+ };
+ };
+ };
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ sram@50000000 {
+ compatible = "mmio-sram";
+ reg = <0x0 0x50000000 0x0 0x10000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x0 0x50000000 0x10000>;
+
+ cpu_scp_lpri0: scp-sram-section@0 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x0 0x80>;
+ };
+
+ cpu_scp_lpri1: scp-sram-section@80 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x80 0x80>;
+ };
+
+ cpu_scp_hpri0: scp-sram-section@100 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x100 0x80>;
+ };
+
+ cpu_scp_hpri2: scp-sram-section@180 {
+ compatible = "arm,scmi-shmem";
+ reg = <0x180 0x80>;
+ };
+ };
+ };
+
+ - |
+ firmware {
+ scmi {
+ compatible = "arm,scmi-smc";
+ shmem = <&cpu_scp_lpri0 &cpu_scp_lpri1>;
+ arm,smc-id = <0xc3000001>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ scmi_devpd1: protocol@11 {
+ reg = <0x11>;
+ #power-domain-cells = <1>;
+ };
+
+ };
+ };
+
+...
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