Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 724 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/riscv/canaan.yaml b/Documentation/devicetree/bindings/riscv/canaan.yaml
new file mode 100644
index 000000000..41fd11f70
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/canaan.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/canaan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Canaan SoC-based boards
+
+maintainers:
+  - Damien Le Moal <dlemoal@kernel.org>
+
+description:
+  Canaan Kendryte K210 SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - items:
+          - const: sipeed,maix-bit
+          - const: sipeed,maix-bitm
+          - const: canaan,kendryte-k210
+
+      - items:
+          - const: sipeed,maix-go
+          - const: canaan,kendryte-k210
+
+      - items:
+          - const: sipeed,maix-dock-m1
+          - const: sipeed,maix-dock-m1w
+          - const: canaan,kendryte-k210
+
+      - items:
+          - const: sipeed,maixduino
+          - const: canaan,kendryte-k210
+
+      - items:
+          - const: canaan,kendryte-kd233
+          - const: canaan,kendryte-k210
+
+      - items:
+          - const: canaan,kendryte-k210
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
new file mode 100644
index 000000000..97e8441ed
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -0,0 +1,212 @@
+# SPDX-License-Identifier: (GPL-2.0 OR MIT)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/cpus.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V CPUs
+
+maintainers:
+  - Paul Walmsley <paul.walmsley@sifive.com>
+  - Palmer Dabbelt <palmer@sifive.com>
+  - Conor Dooley <conor@kernel.org>
+
+description: |
+  This document uses some terminology common to the RISC-V community
+  that is not widely used, the definitions of which are listed here:
+
+  hart: A hardware execution context, which contains all the state
+  mandated by the RISC-V ISA: a PC and some registers.  This
+  terminology is designed to disambiguate software's view of execution
+  contexts from any particular microarchitectural implementation
+  strategy.  For example, an Intel laptop containing one socket with
+  two cores, each of which has two hyperthreads, could be described as
+  having four harts.
+
+allOf:
+  - $ref: /schemas/cpu.yaml#
+  - $ref: extensions.yaml
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - andestech,ax45mp
+              - canaan,k210
+              - sifive,bullet0
+              - sifive,e5
+              - sifive,e7
+              - sifive,e71
+              - sifive,rocket0
+              - sifive,s7
+              - sifive,u5
+              - sifive,u54
+              - sifive,u7
+              - sifive,u74
+              - sifive,u74-mc
+              - thead,c906
+              - thead,c910
+          - const: riscv
+      - items:
+          - enum:
+              - sifive,e51
+              - sifive,u54-mc
+          - const: sifive,rocket0
+          - const: riscv
+      - const: riscv    # Simulator only
+    description:
+      Identifies that the hart uses the RISC-V instruction set
+      and identifies the type of the hart.
+
+  mmu-type:
+    description:
+      Identifies the MMU address translation mode used on this
+      hart.  These values originate from the RISC-V Privileged
+      Specification document, available from
+      https://riscv.org/specifications/
+    $ref: /schemas/types.yaml#/definitions/string
+    enum:
+      - riscv,sv32
+      - riscv,sv39
+      - riscv,sv48
+      - riscv,sv57
+      - riscv,none
+
+  riscv,cbom-block-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      The blocksize in bytes for the Zicbom cache operations.
+
+  riscv,cboz-block-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      The blocksize in bytes for the Zicboz cache operations.
+
+  # RISC-V has multiple properties for cache op block sizes as the sizes
+  # differ between individual CBO extensions
+  cache-op-block-size: false
+  # RISC-V requires 'timebase-frequency' in /cpus, so disallow it here
+  timebase-frequency: false
+
+  interrupt-controller:
+    type: object
+    additionalProperties: false
+    description: Describes the CPU's local interrupt controller
+
+    properties:
+      '#interrupt-cells':
+        const: 1
+
+      compatible:
+        const: riscv,cpu-intc
+
+      interrupt-controller: true
+
+    required:
+      - '#interrupt-cells'
+      - compatible
+      - interrupt-controller
+
+  cpu-idle-states:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      maxItems: 1
+    description: |
+      List of phandles to idle state nodes supported
+      by this hart (see ./idle-states.yaml).
+
+  capacity-dmips-mhz:
+    description:
+      u32 value representing CPU capacity (see ../cpu/cpu-capacity.txt) in
+      DMIPS/MHz, relative to highest capacity-dmips-mhz
+      in the system.
+
+anyOf:
+  - required:
+      - riscv,isa
+  - required:
+      - riscv,isa-base
+
+dependencies:
+  riscv,isa-base: [ "riscv,isa-extensions" ]
+  riscv,isa-extensions: [ "riscv,isa-base" ]
+
+required:
+  - interrupt-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    // Example 1: SiFive Freedom U540G Development Kit
+    cpus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        timebase-frequency = <1000000>;
+        cpu@0 {
+                clock-frequency = <0>;
+                compatible = "sifive,rocket0", "riscv";
+                device_type = "cpu";
+                i-cache-block-size = <64>;
+                i-cache-sets = <128>;
+                i-cache-size = <16384>;
+                reg = <0>;
+                riscv,isa-base = "rv64i";
+                riscv,isa-extensions = "i", "m", "a", "c";
+
+                cpu_intc0: interrupt-controller {
+                        #interrupt-cells = <1>;
+                        compatible = "riscv,cpu-intc";
+                        interrupt-controller;
+                };
+        };
+        cpu@1 {
+                clock-frequency = <0>;
+                compatible = "sifive,rocket0", "riscv";
+                d-cache-block-size = <64>;
+                d-cache-sets = <64>;
+                d-cache-size = <32768>;
+                d-tlb-sets = <1>;
+                d-tlb-size = <32>;
+                device_type = "cpu";
+                i-cache-block-size = <64>;
+                i-cache-sets = <64>;
+                i-cache-size = <32768>;
+                i-tlb-sets = <1>;
+                i-tlb-size = <32>;
+                mmu-type = "riscv,sv39";
+                reg = <1>;
+                tlb-split;
+                riscv,isa-base = "rv64i";
+                riscv,isa-extensions = "i", "m", "a", "f", "d", "c";
+
+                cpu_intc1: interrupt-controller {
+                        #interrupt-cells = <1>;
+                        compatible = "riscv,cpu-intc";
+                        interrupt-controller;
+                };
+        };
+    };
+
+  - |
+    // Example 2: Spike ISA Simulator with 1 Hart
+    cpus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        cpu@0 {
+                device_type = "cpu";
+                reg = <0>;
+                compatible = "riscv";
+                mmu-type = "riscv,sv48";
+                riscv,isa-base = "rv64i";
+                riscv,isa-extensions = "i", "m", "a", "f", "d", "c";
+
+                interrupt-controller {
+                        #interrupt-cells = <1>;
+                        interrupt-controller;
+                        compatible = "riscv,cpu-intc";
+                };
+        };
+    };
+...
diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
new file mode 100644
index 000000000..cc1f546fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
@@ -0,0 +1,250 @@
+# SPDX-License-Identifier: (GPL-2.0 OR MIT)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/extensions.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V ISA extensions
+
+maintainers:
+  - Paul Walmsley <paul.walmsley@sifive.com>
+  - Palmer Dabbelt <palmer@sifive.com>
+  - Conor Dooley <conor@kernel.org>
+
+description: |
+  RISC-V has a large number of extensions, some of which are "standard"
+  extensions, meaning they are ratified by RISC-V International, and others
+  are "vendor" extensions.
+  This document defines properties that indicate whether a hart supports a
+  given extension.
+
+  Once a standard extension has been ratified, no changes in behaviour can be
+  made without the creation of a new extension.
+  The properties for standard extensions therefore map to their originally
+  ratified states, with the exception of the I, Zicntr & Zihpm extensions.
+  See the "i" property for more information.
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: riscv
+
+properties:
+  riscv,isa:
+    description:
+      Identifies the specific RISC-V instruction set architecture
+      supported by the hart.  These are documented in the RISC-V
+      User-Level ISA document, available from
+      https://riscv.org/specifications/
+
+      Due to revisions of the ISA specification, some deviations
+      have arisen over time.
+      Notably, riscv,isa was defined prior to the creation of the
+      Zicntr, Zicsr, Zifencei and Zihpm extensions and thus "i"
+      implies "zicntr_zicsr_zifencei_zihpm".
+
+      While the isa strings in ISA specification are case
+      insensitive, letters in the riscv,isa string must be all
+      lowercase.
+    $ref: /schemas/types.yaml#/definitions/string
+    pattern: ^rv(?:64|32)imaf?d?q?c?b?k?j?p?v?h?(?:[hsxz](?:[a-z])+)?(?:_[hsxz](?:[a-z])+)*$
+    deprecated: true
+
+  riscv,isa-base:
+    description:
+      The base ISA implemented by this hart, as described by the 20191213
+      version of the unprivileged ISA specification.
+    enum:
+      - rv32i
+      - rv64i
+
+  riscv,isa-extensions:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    minItems: 1
+    description: Extensions supported by the hart.
+    items:
+      anyOf:
+        # single letter extensions, in canonical order
+        - const: i
+          description: |
+            The base integer instruction set, as ratified in the 20191213
+            version of the unprivileged ISA specification.
+
+            This does not include Chapter 10, "Counters", which was moved into
+            the Zicntr and Zihpm extensions after the ratification of the
+            20191213 version of the unprivileged specification.
+
+        - const: m
+          description:
+            The standard M extension for integer multiplication and division, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: a
+          description:
+            The standard A extension for atomic instructions, as ratified in the
+            20191213 version of the unprivileged ISA specification.
+
+        - const: f
+          description:
+            The standard F extension for single-precision floating point, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: d
+          description:
+            The standard D extension for double-precision floating-point, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: q
+          description:
+            The standard Q extension for quad-precision floating-point, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: c
+          description:
+            The standard C extension for compressed instructions, as ratified in
+            the 20191213 version of the unprivileged ISA specification.
+
+        - const: v
+          description:
+            The standard V extension for vector operations, as ratified
+            in-and-around commit 7a6c8ae ("Fix text that describes vfmv.v.f
+            encoding") of the riscv-v-spec.
+
+        - const: h
+          description:
+            The standard H extension for hypervisors as ratified in the 20191213
+            version of the privileged ISA specification.
+
+        # multi-letter extensions, sorted alphanumerically
+        - const: smaia
+          description: |
+            The standard Smaia supervisor-level extension for the advanced
+            interrupt architecture for machine-mode-visible csr and behavioural
+            changes to interrupts as frozen at commit ccbddab ("Merge pull
+            request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
+
+        - const: ssaia
+          description: |
+            The standard Ssaia supervisor-level extension for the advanced
+            interrupt architecture for supervisor-mode-visible csr and
+            behavioural changes to interrupts as frozen at commit ccbddab
+            ("Merge pull request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
+
+        - const: sscofpmf
+          description: |
+            The standard Sscofpmf supervisor-level extension for count overflow
+            and mode-based filtering as ratified at commit 01d1df0 ("Add ability
+            to manually trigger workflow. (#2)") of riscv-count-overflow.
+
+        - const: sstc
+          description: |
+            The standard Sstc supervisor-level extension for time compare as
+            ratified at commit 3f9ed34 ("Add ability to manually trigger
+            workflow. (#2)") of riscv-time-compare.
+
+        - const: svinval
+          description:
+            The standard Svinval supervisor-level extension for fine-grained
+            address-translation cache invalidation as ratified in the 20191213
+            version of the privileged ISA specification.
+
+        - const: svnapot
+          description:
+            The standard Svnapot supervisor-level extensions for napot
+            translation contiguity as ratified in the 20191213 version of the
+            privileged ISA specification.
+
+        - const: svpbmt
+          description:
+            The standard Svpbmt supervisor-level extensions for page-based
+            memory types as ratified in the 20191213 version of the privileged
+            ISA specification.
+
+        - const: zba
+          description: |
+            The standard Zba bit-manipulation extension for address generation
+            acceleration instructions as ratified at commit 6d33919 ("Merge pull
+            request #158 from hirooih/clmul-fix-loop-end-condition") of
+            riscv-bitmanip.
+
+        - const: zbb
+          description: |
+            The standard Zbb bit-manipulation extension for basic bit-manipulation
+            as ratified at commit 6d33919 ("Merge pull request #158 from
+            hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.
+
+        - const: zbc
+          description: |
+            The standard Zbc bit-manipulation extension for carry-less
+            multiplication as ratified at commit 6d33919 ("Merge pull request
+            #158 from hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.
+
+        - const: zbs
+          description: |
+            The standard Zbs bit-manipulation extension for single-bit
+            instructions as ratified at commit 6d33919 ("Merge pull request #158
+            from hirooih/clmul-fix-loop-end-condition") of riscv-bitmanip.
+
+        - const: zicbom
+          description:
+            The standard Zicbom extension for base cache management operations as
+            ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
+
+        - const: zicbop
+          description:
+            The standard Zicbop extension for cache-block prefetch instructions
+            as ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of
+            riscv-CMOs.
+
+        - const: zicboz
+          description:
+            The standard Zicboz extension for cache-block zeroing as ratified
+            in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
+
+        - const: zicntr
+          description:
+            The standard Zicntr extension for base counters and timers, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: zicsr
+          description: |
+            The standard Zicsr extension for control and status register
+            instructions, as ratified in the 20191213 version of the
+            unprivileged ISA specification.
+
+            This does not include Chapter 10, "Counters", which documents
+            special case read-only CSRs, that were moved into the Zicntr and
+            Zihpm extensions after the ratification of the 20191213 version of
+            the unprivileged specification.
+
+        - const: zifencei
+          description:
+            The standard Zifencei extension for instruction-fetch fence, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: zihintpause
+          description:
+            The standard Zihintpause extension for pause hints, as ratified in
+            commit d8ab5c7 ("Zihintpause is ratified") of the riscv-isa-manual.
+
+        - const: zihpm
+          description:
+            The standard Zihpm extension for hardware performance counters, as
+            ratified in the 20191213 version of the unprivileged ISA
+            specification.
+
+        - const: ztso
+          description:
+            The standard Ztso extension for total store ordering, as ratified
+            in commit 2e5236 ("Ztso is now ratified.") of the
+            riscv-isa-manual.
+
+additionalProperties: true
+...
diff --git a/Documentation/devicetree/bindings/riscv/microchip.yaml b/Documentation/devicetree/bindings/riscv/microchip.yaml
new file mode 100644
index 000000000..4a29c8906
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/microchip.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/microchip.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PolarFire SoC-based boards
+
+maintainers:
+  - Conor Dooley <conor.dooley@microchip.com>
+  - Daire McNamara <daire.mcnamara@microchip.com>
+
+description:
+  Microchip PolarFire SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - microchip,mpfs-icicle-reference-rtlv2203
+              - microchip,mpfs-icicle-reference-rtlv2210
+          - const: microchip,mpfs-icicle-kit
+          - const: microchip,mpfs
+
+      - items:
+          - enum:
+              - aldec,tysom-m-mpfs250t-rev2
+              - aries,m100pfsevp
+              - microchip,mpfs-sev-kit
+              - sundance,polarberry
+          - const: microchip,mpfs
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/riscv/sifive.yaml b/Documentation/devicetree/bindings/riscv/sifive.yaml
new file mode 100644
index 000000000..ee0a239af
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/sifive.yaml
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: (GPL-2.0 OR MIT)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/sifive.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SiFive SoC-based boards
+
+maintainers:
+  - Paul Walmsley <paul.walmsley@sifive.com>
+  - Palmer Dabbelt <palmer@sifive.com>
+
+description:
+  SiFive SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - sifive,hifive-unleashed-a00
+          - const: sifive,fu540-c000
+          - const: sifive,fu540
+
+      - items:
+          - enum:
+              - sifive,hifive-unmatched-a00
+          - const: sifive,fu740-c000
+          - const: sifive,fu740
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/riscv/starfive.yaml b/Documentation/devicetree/bindings/riscv/starfive.yaml
new file mode 100644
index 000000000..cc4d92f0a
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/starfive.yaml
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/starfive.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive SoC-based boards
+
+maintainers:
+  - Michael Zhu <michael.zhu@starfivetech.com>
+  - Drew Fustini <drew@beagleboard.org>
+
+description:
+  StarFive SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - beagle,beaglev-starlight-jh7100-r0
+              - starfive,visionfive-v1
+          - const: starfive,jh7100
+
+      - items:
+          - enum:
+              - starfive,visionfive-2-v1.2a
+              - starfive,visionfive-2-v1.3b
+          - const: starfive,jh7110
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/riscv/sunxi.yaml b/Documentation/devicetree/bindings/riscv/sunxi.yaml
new file mode 100644
index 000000000..b36e313e1
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/sunxi.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/sunxi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner RISC-V SoC-based boards
+
+maintainers:
+  - Chen-Yu Tsai <wens@csie.org>
+  - Jernej Skrabec <jernej.skrabec@gmail.com>
+  - Samuel Holland <samuel@sholland.org>
+
+description:
+  Allwinner RISC-V SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: Dongshan Nezha STU SoM
+        items:
+          - const: 100ask,dongshan-nezha-stu
+          - const: allwinner,sun20i-d1
+
+      - description: D1 Nezha board
+        items:
+          - const: allwinner,d1-nezha
+          - const: allwinner,sun20i-d1
+
+      - description: ClockworkPi R-01 SoM and v3.14 board
+        items:
+          - const: clockwork,r-01-clockworkpi-v3.14
+          - const: allwinner,sun20i-d1
+
+      - description: ClockworkPi R-01 SoM, v3.14 board, and DevTerm expansion
+        items:
+          - const: clockwork,r-01-devterm-v3.14
+          - const: clockwork,r-01-clockworkpi-v3.14
+          - const: allwinner,sun20i-d1
+
+      - description: Lichee RV SoM
+        items:
+          - const: sipeed,lichee-rv
+          - const: allwinner,sun20i-d1
+
+      - description: Carrier boards for the Lichee RV SoM
+        items:
+          - enum:
+              - sipeed,lichee-rv-86-panel-480p
+              - sipeed,lichee-rv-86-panel-720p
+              - sipeed,lichee-rv-dock
+          - const: sipeed,lichee-rv
+          - const: allwinner,sun20i-d1
+
+      - description: MangoPi MQ board
+        items:
+          - const: widora,mangopi-mq
+          - const: allwinner,sun20i-d1s
+
+      - description: MangoPi MQ Pro board
+        items:
+          - const: widora,mangopi-mq-pro
+          - const: allwinner,sun20i-d1
+
+      - description: MangoPi MQ-R board
+        items:
+          - const: widora,mangopi-mq-r-f133
+          - const: allwinner,sun20i-d1s
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/riscv/thead.yaml b/Documentation/devicetree/bindings/riscv/thead.yaml
new file mode 100644
index 000000000..301912dcd
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/thead.yaml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/thead.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: T-HEAD SoC-based boards
+
+maintainers:
+  - Jisheng Zhang <jszhang@kernel.org>
+
+description:
+  T-HEAD SoC-based boards
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: BeagleV Ahead single board computer
+        items:
+          - const: beagle,beaglev-ahead
+          - const: thead,th1520
+      - description: Sipeed Lichee Pi 4A board for the Sipeed Lichee Module 4A
+        items:
+          - enum:
+              - sipeed,lichee-pi-4a
+          - const: sipeed,lichee-module-4a
+          - const: thead,th1520
+
+additionalProperties: true
+
+...