diff mbox series

[v10,7/8] dt-bindings: Add common bindings for ARM and RISC-V idle states

Message ID 20220126114452.692512-8-apatel@ventanamicro.com
State Superseded
Headers show
Series RISC-V CPU Idle Support | expand

Commit Message

Anup Patel Jan. 26, 2022, 11:44 a.m. UTC
From: Anup Patel <anup.patel@wdc.com>

The RISC-V CPU idle states will be described in under the
/cpus/idle-states DT node in the same way as ARM CPU idle
states.

This patch adds common bindings documentation for both ARM
and RISC-V idle states.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/arm/msm/qcom,idle-state.txt      |   2 +-
 .../devicetree/bindings/arm/psci.yaml         |   2 +-
 .../bindings/{arm => cpu}/idle-states.yaml    | 228 ++++++++++++++++--
 .../devicetree/bindings/riscv/cpus.yaml       |   6 +
 4 files changed, 219 insertions(+), 19 deletions(-)
 rename Documentation/devicetree/bindings/{arm => cpu}/idle-states.yaml (74%)

Comments

Guo Ren Feb. 8, 2022, 6:20 a.m. UTC | #1
Acked-by: Guo Ren <guoren@kernel.org>

On Wed, Jan 26, 2022 at 7:50 PM Anup Patel <apatel@ventanamicro.com> wrote:
>
> From: Anup Patel <anup.patel@wdc.com>
>
> The RISC-V CPU idle states will be described in under the
> /cpus/idle-states DT node in the same way as ARM CPU idle
> states.
>
> This patch adds common bindings documentation for both ARM
> and RISC-V idle states.
>
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  .../bindings/arm/msm/qcom,idle-state.txt      |   2 +-
>  .../devicetree/bindings/arm/psci.yaml         |   2 +-
>  .../bindings/{arm => cpu}/idle-states.yaml    | 228 ++++++++++++++++--
>  .../devicetree/bindings/riscv/cpus.yaml       |   6 +
>  4 files changed, 219 insertions(+), 19 deletions(-)
>  rename Documentation/devicetree/bindings/{arm => cpu}/idle-states.yaml (74%)
>
> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
> index 6ce0b212ec6d..606b4b1b709d 100644
> --- a/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
> @@ -81,4 +81,4 @@ Example:
>                 };
>         };
>
> -[1]. Documentation/devicetree/bindings/arm/idle-states.yaml
> +[1]. Documentation/devicetree/bindings/cpu/idle-states.yaml
> diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
> index 8b77cf83a095..dd83ef278af0 100644
> --- a/Documentation/devicetree/bindings/arm/psci.yaml
> +++ b/Documentation/devicetree/bindings/arm/psci.yaml
> @@ -101,7 +101,7 @@ properties:
>        bindings in [1]) must specify this property.
>
>        [1] Kernel documentation - ARM idle states bindings
> -        Documentation/devicetree/bindings/arm/idle-states.yaml
> +        Documentation/devicetree/bindings/cpu/idle-states.yaml
>
>  patternProperties:
>    "^power-domain-":
> diff --git a/Documentation/devicetree/bindings/arm/idle-states.yaml b/Documentation/devicetree/bindings/cpu/idle-states.yaml
> similarity index 74%
> rename from Documentation/devicetree/bindings/arm/idle-states.yaml
> rename to Documentation/devicetree/bindings/cpu/idle-states.yaml
> index 52bce5dbb11f..95506ffb816c 100644
> --- a/Documentation/devicetree/bindings/arm/idle-states.yaml
> +++ b/Documentation/devicetree/bindings/cpu/idle-states.yaml
> @@ -1,25 +1,30 @@
>  # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>  %YAML 1.2
>  ---
> -$id: http://devicetree.org/schemas/arm/idle-states.yaml#
> +$id: http://devicetree.org/schemas/cpu/idle-states.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>
> -title: ARM idle states binding description
> +title: Idle states binding description
>
>  maintainers:
>    - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> +  - Anup Patel <anup@brainfault.org>
>
>  description: |+
>    ==========================================
>    1 - Introduction
>    ==========================================
>
> -  ARM systems contain HW capable of managing power consumption dynamically,
> -  where cores can be put in different low-power states (ranging from simple wfi
> -  to power gating) according to OS PM policies. The CPU states representing the
> -  range of dynamic idle states that a processor can enter at run-time, can be
> -  specified through device tree bindings representing the parameters required to
> -  enter/exit specific idle states on a given processor.
> +  ARM and RISC-V systems contain HW capable of managing power consumption
> +  dynamically, where cores can be put in different low-power states (ranging
> +  from simple wfi to power gating) according to OS PM policies. The CPU states
> +  representing the range of dynamic idle states that a processor can enter at
> +  run-time, can be specified through device tree bindings representing the
> +  parameters required to enter/exit specific idle states on a given processor.
> +
> +  ==========================================
> +  2 - ARM idle states
> +  ==========================================
>
>    According to the Server Base System Architecture document (SBSA, [3]), the
>    power states an ARM CPU can be put into are identified by the following list:
> @@ -43,8 +48,23 @@ description: |+
>    The device tree binding definition for ARM idle states is the subject of this
>    document.
>
> +  ==========================================
> +  3 - RISC-V idle states
> +  ==========================================
> +
> +  On RISC-V systems, the HARTs (or CPUs) [6] can be put in platform specific
> +  suspend (or idle) states (ranging from simple WFI, power gating, etc). The
> +  RISC-V SBI v0.3 (or higher) [7] hart state management extension provides a
> +  standard mechanism for OS to request HART state transitions.
> +
> +  The platform specific suspend (or idle) states of a hart can be either
> +  retentive or non-rententive in nature. A retentive suspend state will
> +  preserve HART registers and CSR values for all privilege modes whereas
> +  a non-retentive suspend state will not preserve HART registers and CSR
> +  values.
> +
>    ===========================================
> -  2 - idle-states definitions
> +  4 - idle-states definitions
>    ===========================================
>
>    Idle states are characterized for a specific system through a set of
> @@ -211,10 +231,10 @@ description: |+
>    properties specification that is the subject of the following sections.
>
>    ===========================================
> -  3 - idle-states node
> +  5 - idle-states node
>    ===========================================
>
> -  ARM processor idle states are defined within the idle-states node, which is
> +  The processor idle states are defined within the idle-states node, which is
>    a direct child of the cpus node [1] and provides a container where the
>    processor idle states, defined as device tree nodes, are listed.
>
> @@ -223,7 +243,7 @@ description: |+
>    just supports idle_standby, an idle-states node is not required.
>
>    ===========================================
> -  4 - References
> +  6 - References
>    ===========================================
>
>    [1] ARM Linux Kernel documentation - CPUs bindings
> @@ -238,9 +258,15 @@ description: |+
>    [4] ARM Architecture Reference Manuals
>        http://infocenter.arm.com/help/index.jsp
>
> -  [6] ARM Linux Kernel documentation - Booting AArch64 Linux
> +  [5] ARM Linux Kernel documentation - Booting AArch64 Linux
>        Documentation/arm64/booting.rst
>
> +  [6] RISC-V Linux Kernel documentation - CPUs bindings
> +      Documentation/devicetree/bindings/riscv/cpus.yaml
> +
> +  [7] RISC-V Supervisor Binary Interface (SBI)
> +      http://github.com/riscv/riscv-sbi-doc/riscv-sbi.adoc
> +
>  properties:
>    $nodename:
>      const: idle-states
> @@ -253,7 +279,7 @@ properties:
>        On ARM 32-bit systems this property is optional
>
>        This assumes that the "enable-method" property is set to "psci" in the cpu
> -      node[6] that is responsible for setting up CPU idle management in the OS
> +      node[5] that is responsible for setting up CPU idle management in the OS
>        implementation.
>      const: psci
>
> @@ -265,8 +291,8 @@ patternProperties:
>        as follows.
>
>        The idle state entered by executing the wfi instruction (idle_standby
> -      SBSA,[3][4]) is considered standard on all ARM platforms and therefore
> -      must not be listed.
> +      SBSA,[3][4]) is considered standard on all ARM and RISC-V platforms and
> +      therefore must not be listed.
>
>        In addition to the properties listed above, a state node may require
>        additional properties specific to the entry-method defined in the
> @@ -275,7 +301,27 @@ patternProperties:
>
>      properties:
>        compatible:
> -        const: arm,idle-state
> +        enum:
> +          - arm,idle-state
> +          - riscv,idle-state
> +
> +      arm,psci-suspend-param:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: |
> +          power_state parameter to pass to the ARM PSCI suspend call.
> +
> +          Device tree nodes that require usage of PSCI CPU_SUSPEND function
> +          (i.e. idle states node with entry-method property is set to "psci")
> +          must specify this property.
> +
> +      riscv,sbi-suspend-param:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: |
> +          suspend_type parameter to pass to the RISC-V SBI HSM suspend call.
> +
> +          This property is required in idle state nodes of device tree meant
> +          for RISC-V systems. For more details on the suspend_type parameter
> +          refer the SBI specifiation v0.3 (or higher) [7].
>
>        local-timer-stop:
>          description:
> @@ -317,6 +363,8 @@ patternProperties:
>          description:
>            A string used as a descriptive name for the idle state.
>
> +    additionalProperties: false
> +
>      required:
>        - compatible
>        - entry-latency-us
> @@ -658,4 +706,150 @@ examples:
>          };
>      };
>
> +  - |
> +    // Example 3 (RISC-V 64-bit, 4-cpu systems, two clusters):
> +
> +    cpus {
> +        #size-cells = <0>;
> +        #address-cells = <1>;
> +
> +        cpu@0 {
> +            device_type = "cpu";
> +            compatible = "riscv";
> +            reg = <0x0>;
> +            riscv,isa = "rv64imafdc";
> +            mmu-type = "riscv,sv48";
> +            cpu-idle-states = <&CPU_RET_0_0 &CPU_NONRET_0_0
> +                            &CLUSTER_RET_0 &CLUSTER_NONRET_0>;
> +
> +            cpu_intc0: interrupt-controller {
> +                #interrupt-cells = <1>;
> +                compatible = "riscv,cpu-intc";
> +                interrupt-controller;
> +            };
> +        };
> +
> +        cpu@1 {
> +            device_type = "cpu";
> +            compatible = "riscv";
> +            reg = <0x1>;
> +            riscv,isa = "rv64imafdc";
> +            mmu-type = "riscv,sv48";
> +            cpu-idle-states = <&CPU_RET_0_0 &CPU_NONRET_0_0
> +                            &CLUSTER_RET_0 &CLUSTER_NONRET_0>;
> +
> +            cpu_intc1: interrupt-controller {
> +                #interrupt-cells = <1>;
> +                compatible = "riscv,cpu-intc";
> +                interrupt-controller;
> +            };
> +        };
> +
> +        cpu@10 {
> +            device_type = "cpu";
> +            compatible = "riscv";
> +            reg = <0x10>;
> +            riscv,isa = "rv64imafdc";
> +            mmu-type = "riscv,sv48";
> +            cpu-idle-states = <&CPU_RET_1_0 &CPU_NONRET_1_0
> +                            &CLUSTER_RET_1 &CLUSTER_NONRET_1>;
> +
> +            cpu_intc10: interrupt-controller {
> +                #interrupt-cells = <1>;
> +                compatible = "riscv,cpu-intc";
> +                interrupt-controller;
> +            };
> +        };
> +
> +        cpu@11 {
> +            device_type = "cpu";
> +            compatible = "riscv";
> +            reg = <0x11>;
> +            riscv,isa = "rv64imafdc";
> +            mmu-type = "riscv,sv48";
> +            cpu-idle-states = <&CPU_RET_1_0 &CPU_NONRET_1_0
> +                            &CLUSTER_RET_1 &CLUSTER_NONRET_1>;
> +
> +            cpu_intc11: interrupt-controller {
> +                #interrupt-cells = <1>;
> +                compatible = "riscv,cpu-intc";
> +                interrupt-controller;
> +            };
> +        };
> +
> +        idle-states {
> +            CPU_RET_0_0: cpu-retentive-0-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x10000000>;
> +                entry-latency-us = <20>;
> +                exit-latency-us = <40>;
> +                min-residency-us = <80>;
> +            };
> +
> +            CPU_NONRET_0_0: cpu-nonretentive-0-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x90000000>;
> +                entry-latency-us = <250>;
> +                exit-latency-us = <500>;
> +                min-residency-us = <950>;
> +            };
> +
> +            CLUSTER_RET_0: cluster-retentive-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x11000000>;
> +                local-timer-stop;
> +                entry-latency-us = <50>;
> +                exit-latency-us = <100>;
> +                min-residency-us = <250>;
> +                wakeup-latency-us = <130>;
> +            };
> +
> +            CLUSTER_NONRET_0: cluster-nonretentive-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x91000000>;
> +                local-timer-stop;
> +                entry-latency-us = <600>;
> +                exit-latency-us = <1100>;
> +                min-residency-us = <2700>;
> +                wakeup-latency-us = <1500>;
> +            };
> +
> +            CPU_RET_1_0: cpu-retentive-1-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x10000010>;
> +                entry-latency-us = <20>;
> +                exit-latency-us = <40>;
> +                min-residency-us = <80>;
> +            };
> +
> +            CPU_NONRET_1_0: cpu-nonretentive-1-0 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x90000010>;
> +                entry-latency-us = <250>;
> +                exit-latency-us = <500>;
> +                min-residency-us = <950>;
> +            };
> +
> +            CLUSTER_RET_1: cluster-retentive-1 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x11000010>;
> +                local-timer-stop;
> +                entry-latency-us = <50>;
> +                exit-latency-us = <100>;
> +                min-residency-us = <250>;
> +                wakeup-latency-us = <130>;
> +            };
> +
> +            CLUSTER_NONRET_1: cluster-nonretentive-1 {
> +                compatible = "riscv,idle-state";
> +                riscv,sbi-suspend-param = <0x91000010>;
> +                local-timer-stop;
> +                entry-latency-us = <600>;
> +                exit-latency-us = <1100>;
> +                min-residency-us = <2700>;
> +                wakeup-latency-us = <1500>;
> +            };
> +        };
> +    };
> +
>  ...
> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
> index aa5fb64d57eb..f62f646bc695 100644
> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
> @@ -99,6 +99,12 @@ properties:
>        - compatible
>        - interrupt-controller
>
> +  cpu-idle-states:
> +    $ref: '/schemas/types.yaml#/definitions/phandle-array'
> +    description: |
> +      List of phandles to idle state nodes supported
> +      by this hart (see ./idle-states.yaml).
> +
>  required:
>    - riscv,isa
>    - interrupt-controller
> --
> 2.25.1
>
>
> --
> kvm-riscv mailing list
> kvm-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kvm-riscv
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
index 6ce0b212ec6d..606b4b1b709d 100644
--- a/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
+++ b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
@@ -81,4 +81,4 @@  Example:
 		};
 	};
 
-[1]. Documentation/devicetree/bindings/arm/idle-states.yaml
+[1]. Documentation/devicetree/bindings/cpu/idle-states.yaml
diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index 8b77cf83a095..dd83ef278af0 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -101,7 +101,7 @@  properties:
       bindings in [1]) must specify this property.
 
       [1] Kernel documentation - ARM idle states bindings
-        Documentation/devicetree/bindings/arm/idle-states.yaml
+        Documentation/devicetree/bindings/cpu/idle-states.yaml
 
 patternProperties:
   "^power-domain-":
diff --git a/Documentation/devicetree/bindings/arm/idle-states.yaml b/Documentation/devicetree/bindings/cpu/idle-states.yaml
similarity index 74%
rename from Documentation/devicetree/bindings/arm/idle-states.yaml
rename to Documentation/devicetree/bindings/cpu/idle-states.yaml
index 52bce5dbb11f..95506ffb816c 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.yaml
+++ b/Documentation/devicetree/bindings/cpu/idle-states.yaml
@@ -1,25 +1,30 @@ 
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/arm/idle-states.yaml#
+$id: http://devicetree.org/schemas/cpu/idle-states.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: ARM idle states binding description
+title: Idle states binding description
 
 maintainers:
   - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+  - Anup Patel <anup@brainfault.org>
 
 description: |+
   ==========================================
   1 - Introduction
   ==========================================
 
-  ARM systems contain HW capable of managing power consumption dynamically,
-  where cores can be put in different low-power states (ranging from simple wfi
-  to power gating) according to OS PM policies. The CPU states representing the
-  range of dynamic idle states that a processor can enter at run-time, can be
-  specified through device tree bindings representing the parameters required to
-  enter/exit specific idle states on a given processor.
+  ARM and RISC-V systems contain HW capable of managing power consumption
+  dynamically, where cores can be put in different low-power states (ranging
+  from simple wfi to power gating) according to OS PM policies. The CPU states
+  representing the range of dynamic idle states that a processor can enter at
+  run-time, can be specified through device tree bindings representing the
+  parameters required to enter/exit specific idle states on a given processor.
+
+  ==========================================
+  2 - ARM idle states
+  ==========================================
 
   According to the Server Base System Architecture document (SBSA, [3]), the
   power states an ARM CPU can be put into are identified by the following list:
@@ -43,8 +48,23 @@  description: |+
   The device tree binding definition for ARM idle states is the subject of this
   document.
 
+  ==========================================
+  3 - RISC-V idle states
+  ==========================================
+
+  On RISC-V systems, the HARTs (or CPUs) [6] can be put in platform specific
+  suspend (or idle) states (ranging from simple WFI, power gating, etc). The
+  RISC-V SBI v0.3 (or higher) [7] hart state management extension provides a
+  standard mechanism for OS to request HART state transitions.
+
+  The platform specific suspend (or idle) states of a hart can be either
+  retentive or non-rententive in nature. A retentive suspend state will
+  preserve HART registers and CSR values for all privilege modes whereas
+  a non-retentive suspend state will not preserve HART registers and CSR
+  values.
+
   ===========================================
-  2 - idle-states definitions
+  4 - idle-states definitions
   ===========================================
 
   Idle states are characterized for a specific system through a set of
@@ -211,10 +231,10 @@  description: |+
   properties specification that is the subject of the following sections.
 
   ===========================================
-  3 - idle-states node
+  5 - idle-states node
   ===========================================
 
-  ARM processor idle states are defined within the idle-states node, which is
+  The processor idle states are defined within the idle-states node, which is
   a direct child of the cpus node [1] and provides a container where the
   processor idle states, defined as device tree nodes, are listed.
 
@@ -223,7 +243,7 @@  description: |+
   just supports idle_standby, an idle-states node is not required.
 
   ===========================================
-  4 - References
+  6 - References
   ===========================================
 
   [1] ARM Linux Kernel documentation - CPUs bindings
@@ -238,9 +258,15 @@  description: |+
   [4] ARM Architecture Reference Manuals
       http://infocenter.arm.com/help/index.jsp
 
-  [6] ARM Linux Kernel documentation - Booting AArch64 Linux
+  [5] ARM Linux Kernel documentation - Booting AArch64 Linux
       Documentation/arm64/booting.rst
 
+  [6] RISC-V Linux Kernel documentation - CPUs bindings
+      Documentation/devicetree/bindings/riscv/cpus.yaml
+
+  [7] RISC-V Supervisor Binary Interface (SBI)
+      http://github.com/riscv/riscv-sbi-doc/riscv-sbi.adoc
+
 properties:
   $nodename:
     const: idle-states
@@ -253,7 +279,7 @@  properties:
       On ARM 32-bit systems this property is optional
 
       This assumes that the "enable-method" property is set to "psci" in the cpu
-      node[6] that is responsible for setting up CPU idle management in the OS
+      node[5] that is responsible for setting up CPU idle management in the OS
       implementation.
     const: psci
 
@@ -265,8 +291,8 @@  patternProperties:
       as follows.
 
       The idle state entered by executing the wfi instruction (idle_standby
-      SBSA,[3][4]) is considered standard on all ARM platforms and therefore
-      must not be listed.
+      SBSA,[3][4]) is considered standard on all ARM and RISC-V platforms and
+      therefore must not be listed.
 
       In addition to the properties listed above, a state node may require
       additional properties specific to the entry-method defined in the
@@ -275,7 +301,27 @@  patternProperties:
 
     properties:
       compatible:
-        const: arm,idle-state
+        enum:
+          - arm,idle-state
+          - riscv,idle-state
+
+      arm,psci-suspend-param:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          power_state parameter to pass to the ARM PSCI suspend call.
+
+          Device tree nodes that require usage of PSCI CPU_SUSPEND function
+          (i.e. idle states node with entry-method property is set to "psci")
+          must specify this property.
+
+      riscv,sbi-suspend-param:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          suspend_type parameter to pass to the RISC-V SBI HSM suspend call.
+
+          This property is required in idle state nodes of device tree meant
+          for RISC-V systems. For more details on the suspend_type parameter
+          refer the SBI specifiation v0.3 (or higher) [7].
 
       local-timer-stop:
         description:
@@ -317,6 +363,8 @@  patternProperties:
         description:
           A string used as a descriptive name for the idle state.
 
+    additionalProperties: false
+
     required:
       - compatible
       - entry-latency-us
@@ -658,4 +706,150 @@  examples:
         };
     };
 
+  - |
+    // Example 3 (RISC-V 64-bit, 4-cpu systems, two clusters):
+
+    cpus {
+        #size-cells = <0>;
+        #address-cells = <1>;
+
+        cpu@0 {
+            device_type = "cpu";
+            compatible = "riscv";
+            reg = <0x0>;
+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv48";
+            cpu-idle-states = <&CPU_RET_0_0 &CPU_NONRET_0_0
+                            &CLUSTER_RET_0 &CLUSTER_NONRET_0>;
+
+            cpu_intc0: interrupt-controller {
+                #interrupt-cells = <1>;
+                compatible = "riscv,cpu-intc";
+                interrupt-controller;
+            };
+        };
+
+        cpu@1 {
+            device_type = "cpu";
+            compatible = "riscv";
+            reg = <0x1>;
+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv48";
+            cpu-idle-states = <&CPU_RET_0_0 &CPU_NONRET_0_0
+                            &CLUSTER_RET_0 &CLUSTER_NONRET_0>;
+
+            cpu_intc1: interrupt-controller {
+                #interrupt-cells = <1>;
+                compatible = "riscv,cpu-intc";
+                interrupt-controller;
+            };
+        };
+
+        cpu@10 {
+            device_type = "cpu";
+            compatible = "riscv";
+            reg = <0x10>;
+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv48";
+            cpu-idle-states = <&CPU_RET_1_0 &CPU_NONRET_1_0
+                            &CLUSTER_RET_1 &CLUSTER_NONRET_1>;
+
+            cpu_intc10: interrupt-controller {
+                #interrupt-cells = <1>;
+                compatible = "riscv,cpu-intc";
+                interrupt-controller;
+            };
+        };
+
+        cpu@11 {
+            device_type = "cpu";
+            compatible = "riscv";
+            reg = <0x11>;
+            riscv,isa = "rv64imafdc";
+            mmu-type = "riscv,sv48";
+            cpu-idle-states = <&CPU_RET_1_0 &CPU_NONRET_1_0
+                            &CLUSTER_RET_1 &CLUSTER_NONRET_1>;
+
+            cpu_intc11: interrupt-controller {
+                #interrupt-cells = <1>;
+                compatible = "riscv,cpu-intc";
+                interrupt-controller;
+            };
+        };
+
+        idle-states {
+            CPU_RET_0_0: cpu-retentive-0-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x10000000>;
+                entry-latency-us = <20>;
+                exit-latency-us = <40>;
+                min-residency-us = <80>;
+            };
+
+            CPU_NONRET_0_0: cpu-nonretentive-0-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x90000000>;
+                entry-latency-us = <250>;
+                exit-latency-us = <500>;
+                min-residency-us = <950>;
+            };
+
+            CLUSTER_RET_0: cluster-retentive-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x11000000>;
+                local-timer-stop;
+                entry-latency-us = <50>;
+                exit-latency-us = <100>;
+                min-residency-us = <250>;
+                wakeup-latency-us = <130>;
+            };
+
+            CLUSTER_NONRET_0: cluster-nonretentive-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x91000000>;
+                local-timer-stop;
+                entry-latency-us = <600>;
+                exit-latency-us = <1100>;
+                min-residency-us = <2700>;
+                wakeup-latency-us = <1500>;
+            };
+
+            CPU_RET_1_0: cpu-retentive-1-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x10000010>;
+                entry-latency-us = <20>;
+                exit-latency-us = <40>;
+                min-residency-us = <80>;
+            };
+
+            CPU_NONRET_1_0: cpu-nonretentive-1-0 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x90000010>;
+                entry-latency-us = <250>;
+                exit-latency-us = <500>;
+                min-residency-us = <950>;
+            };
+
+            CLUSTER_RET_1: cluster-retentive-1 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x11000010>;
+                local-timer-stop;
+                entry-latency-us = <50>;
+                exit-latency-us = <100>;
+                min-residency-us = <250>;
+                wakeup-latency-us = <130>;
+            };
+
+            CLUSTER_NONRET_1: cluster-nonretentive-1 {
+                compatible = "riscv,idle-state";
+                riscv,sbi-suspend-param = <0x91000010>;
+                local-timer-stop;
+                entry-latency-us = <600>;
+                exit-latency-us = <1100>;
+                min-residency-us = <2700>;
+                wakeup-latency-us = <1500>;
+            };
+        };
+    };
+
 ...
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
index aa5fb64d57eb..f62f646bc695 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -99,6 +99,12 @@  properties:
       - compatible
       - interrupt-controller
 
+  cpu-idle-states:
+    $ref: '/schemas/types.yaml#/definitions/phandle-array'
+    description: |
+      List of phandles to idle state nodes supported
+      by this hart (see ./idle-states.yaml).
+
 required:
   - riscv,isa
   - interrupt-controller