Document bindings for Tenstorrent Atlantis syscon that manages clocks
and resets. This syscon block is instantiated 4 times in the SoC.
This commit documents the clocks from the RCPU syscon block.
Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
---
.../tenstorrent/tenstorrent,atlantis-syscon.yaml | 90 ++++++++++++++++++
MAINTAINERS | 2 +
.../clock/tenstorrent,atlantis-syscon.h | 101 +++++++++++++++++++++
3 files changed, 193 insertions(+)
diff --git a/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
new file mode 100644
index 000000000000..49fbe2423be0
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Tenstorrent Atlantis SoC Syscon
+
+maintainers:
+ - Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
+
+description:
+ Multifunctional register block found in Tenstorrent Atlantis SoC whose main function
+ is to control clocks and resets. This Block is instantiated multiple times in the SoC,
+ each block controls clock and resets for a different subsystem.
+
+ RCPU syscon serves low speed IO interfaces on chip
+ PCIe syscon serves all PCIe related functions
+ HSIO syscon serves high speed IO interfaces (Ethernet, USB)
+ MM syscon serves GPU, display and video processing functions
+
+properties:
+ compatible:
+ enum:
+ - tenstorrent,atlantis-syscon-rcpu
+ - tenstorrent,atlantis-syscon-pcie
+ - tenstorrent,atlantis-syscon-mm
+ - tenstorrent,atlantis-syscon-hsio
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ "#clock-cells":
+ const: 1
+ description:
+ See <dt-bindings/clock/tenstorrent,atlantis-syscon.h> for valid indices.
+
+ "#reset-cells":
+ const: 1
+
+ tenstorrent,syscon-rcpu:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description:
+ Phandle reference to RCPU syscon, needed by other 3 syscons (PCIe, MM, HSIO)
+ as the control registers for the PLLs that drive these subsystems are in RCPU
+ syscon's range
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - "#clock-cells"
+ - "#reset-cells"
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - tenstorrent,atlantis-syscon-pcie
+ - tenstorrent,atlantis-syscon-mm
+ - tenstorrent,atlantis-syscon-hsio
+ then:
+ required:
+ - tenstorrent,syscon-rcpu
+
+additionalProperties: false
+
+examples:
+ - |
+ syscon_rcpu: system-controller@a8000000 {
+ compatible = "tenstorrent,atlantis-syscon-rcpu";
+ reg = <0xa8000000 0x10000>;
+ clocks = <&osc_24m>;
+ #clock-cells = <1>;
+ #reset-cells = <1>;
+ };
+ - |
+ syscon_hsio: system-controller@e00c0000 {
+ compatible = "tenstorrent,atlantis-syscon-hsio";
+ reg = <0xe00c0000 0x500>;
+ clocks = <&osc_24m>;
+ #clock-cells = <1>;
+ #reset-cells = <1>;
+ tenstorrent,syscon-rcpu = <&syscon_rcpu>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index dc731d37c8fe..19a98b1fa456 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22535,7 +22535,9 @@ L: linux-riscv@lists.infradead.org
S: Maintained
T: git https://github.com/tenstorrent/linux.git
F: Documentation/devicetree/bindings/riscv/tenstorrent.yaml
+F: Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
F: arch/riscv/boot/dts/tenstorrent/
+F: include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
RISC-V THEAD SoC SUPPORT
M: Drew Fustini <fustini@kernel.org>
diff --git a/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
new file mode 100644
index 000000000000..053cef2b43c8
--- /dev/null
+++ b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (c) 2026 Tenstorrent
+ */
+
+#ifndef _DT_BINDINGS_ATLANTIS_SYSCON_H
+#define _DT_BINDINGS_ATLANTIS_SYSCON_H
+
+/*
+ * RCPU Domain Clock IDs
+ */
+#define CLK_RCPU_PLL 0
+#define CLK_RCPU_ROOT 1
+#define CLK_RCPU_DIV2 2
+#define CLK_RCPU_DIV4 3
+#define CLK_RCPU_RTC 4
+#define CLK_SMNDMA0_ACLK 5
+#define CLK_SMNDMA1_ACLK 6
+#define CLK_WDT0_PCLK 7
+#define CLK_WDT1_PCLK 8
+#define CLK_TIMER_PCLK 9
+#define CLK_PVTC_PCLK 10
+#define CLK_PMU_PCLK 11
+#define CLK_MAILBOX_HCLK 12
+#define CLK_SEC_SPACC_HCLK 13
+#define CLK_SEC_OTP_HCLK 14
+#define CLK_TRNG_PCLK 15
+#define CLK_SEC_CRC_HCLK 16
+#define CLK_SMN_HCLK 17
+#define CLK_AHB0_HCLK 18
+#define CLK_SMN_PCLK 19
+#define CLK_SMN_CLK 20
+#define CLK_SCRATCHPAD_CLK 21
+#define CLK_RCPU_CORE_CLK 22
+#define CLK_RCPU_ROM_CLK 23
+#define CLK_OTP_LOAD_CLK 24
+#define CLK_NOC_PLL 25
+#define CLK_NOCC_CLK 26
+#define CLK_NOCC_DIV2 27
+#define CLK_NOCC_DIV4 28
+#define CLK_NOCC_RTC 29
+#define CLK_NOCC_CAN 30
+#define CLK_QSPI_SCLK 31
+#define CLK_QSPI_HCLK 32
+#define CLK_I2C0_PCLK 33
+#define CLK_I2C1_PCLK 34
+#define CLK_I2C2_PCLK 35
+#define CLK_I2C3_PCLK 36
+#define CLK_I2C4_PCLK 37
+#define CLK_UART0_PCLK 38
+#define CLK_UART1_PCLK 39
+#define CLK_UART2_PCLK 40
+#define CLK_UART3_PCLK 41
+#define CLK_UART4_PCLK 42
+#define CLK_SPI0_PCLK 43
+#define CLK_SPI1_PCLK 44
+#define CLK_SPI2_PCLK 45
+#define CLK_SPI3_PCLK 46
+#define CLK_GPIO_PCLK 47
+#define CLK_CAN0_HCLK 48
+#define CLK_CAN0_CLK 49
+#define CLK_CAN1_HCLK 50
+#define CLK_CAN1_CLK 51
+#define CLK_CAN0_TIMER_CLK 52
+#define CLK_CAN1_TIMER_CLK 53
+
+/* RCPU domain reset */
+#define RST_SMNDMA0 0
+#define RST_SMNDMA1 1
+#define RST_WDT0 2
+#define RST_WDT1 3
+#define RST_TMR 4
+#define RST_PVTC 5
+#define RST_PMU 6
+#define RST_MAILBOX 7
+#define RST_SPACC 8
+#define RST_OTP 9
+#define RST_TRNG 10
+#define RST_CRC 11
+#define RST_QSPI 12
+#define RST_I2C0 13
+#define RST_I2C1 14
+#define RST_I2C2 15
+#define RST_I2C3 16
+#define RST_I2C4 17
+#define RST_UART0 18
+#define RST_UART1 19
+#define RST_UART2 20
+#define RST_UART3 21
+#define RST_UART4 22
+#define RST_SPI0 23
+#define RST_SPI1 24
+#define RST_SPI2 25
+#define RST_SPI3 26
+#define RST_GPIO 27
+#define RST_CAN0 28
+#define RST_CAN1 29
+#define RST_I2S0 30
+#define RST_I2S1 31
+
+#endif /* _DT_BINDINGS_ATLANTIS_SYSCON_H */
--
2.43.0On 22/01/2026 23:36, Anirudh Srinivasan wrote:
> Document bindings for Tenstorrent Atlantis syscon that manages clocks
> and resets. This syscon block is instantiated 4 times in the SoC.
> This commit documents the clocks from the RCPU syscon block.
>
> Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
> ---
> .../tenstorrent/tenstorrent,atlantis-syscon.yaml | 90 ++++++++++++++++++
> MAINTAINERS | 2 +
> .../clock/tenstorrent,atlantis-syscon.h | 101 +++++++++++++++++++++
> 3 files changed, 193 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
> new file mode 100644
> index 000000000000..49fbe2423be0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Tenstorrent Atlantis SoC Syscon
> +
> +maintainers:
> + - Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
> +
> +description:
> + Multifunctional register block found in Tenstorrent Atlantis SoC whose main function
> + is to control clocks and resets. This Block is instantiated multiple times in the SoC,
Please wrap code according to the preferred limit expressed in Kernel
coding style (checkpatch is not a coding style description, but only a
tool). However don't wrap blindly (see Kernel coding style).
> + each block controls clock and resets for a different subsystem.
> +
> + RCPU syscon serves low speed IO interfaces on chip
> + PCIe syscon serves all PCIe related functions
> + HSIO syscon serves high speed IO interfaces (Ethernet, USB)
> + MM syscon serves GPU, display and video processing functions
Same feedback - clock controllers go to clock, not soc.
> +
> +properties:
> + compatible:
> + enum:
> + - tenstorrent,atlantis-syscon-rcpu
> + - tenstorrent,atlantis-syscon-pcie
> + - tenstorrent,atlantis-syscon-mm
> + - tenstorrent,atlantis-syscon-hsio
Why do you call everything syscon? syscon is not a hardware name. How is
this exactly called in your datasheet?
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + "#clock-cells":
> + const: 1
> + description:
> + See <dt-bindings/clock/tenstorrent,atlantis-syscon.h> for valid indices.
> +
> + "#reset-cells":
> + const: 1
> +
> + tenstorrent,syscon-rcpu:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description:
> + Phandle reference to RCPU syscon, needed by other 3 syscons (PCIe, MM, HSIO)
> + as the control registers for the PLLs that drive these subsystems are in RCPU
> + syscon's range
> +
> +required:
> + - compatible
> + - reg
> + - clocks
> + - "#clock-cells"
> + - "#reset-cells"
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - tenstorrent,atlantis-syscon-pcie
> + - tenstorrent,atlantis-syscon-mm
> + - tenstorrent,atlantis-syscon-hsio
> + then:
> + required:
> + - tenstorrent,syscon-rcpu
else - properties false, see other examples how to do it.
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + syscon_rcpu: system-controller@a8000000 {
Drop entire example, one is enough.
> + compatible = "tenstorrent,atlantis-syscon-rcpu";
> + reg = <0xa8000000 0x10000>;
> + clocks = <&osc_24m>;
> + #clock-cells = <1>;
> + #reset-cells = <1>;
> + };
> + - |
> + syscon_hsio: system-controller@e00c0000 {
Drop unused label.
> + compatible = "tenstorrent,atlantis-syscon-hsio";
> + reg = <0xe00c0000 0x500>;
> + clocks = <&osc_24m>;
> + #clock-cells = <1>;
> + #reset-cells = <1>;
> + tenstorrent,syscon-rcpu = <&syscon_rcpu>;
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dc731d37c8fe..19a98b1fa456 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22535,7 +22535,9 @@ L: linux-riscv@lists.infradead.org
> S: Maintained
> T: git https://github.com/tenstorrent/linux.git
> F: Documentation/devicetree/bindings/riscv/tenstorrent.yaml
> +F: Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
> F: arch/riscv/boot/dts/tenstorrent/
> +F: include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
>
> RISC-V THEAD SoC SUPPORT
> M: Drew Fustini <fustini@kernel.org>
> diff --git a/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
> new file mode 100644
> index 000000000000..053cef2b43c8
> --- /dev/null
> +++ b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
Name will follow bindings.
>
Best regards,
Krzysztof
Hi Krzysztof,
On Fri, Jan 23, 2026 at 1:10 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On 22/01/2026 23:36, Anirudh Srinivasan wrote:
> > Document bindings for Tenstorrent Atlantis syscon that manages clocks
> > and resets. This syscon block is instantiated 4 times in the SoC.
> > This commit documents the clocks from the RCPU syscon block.
> > diff --git a/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
> > new file mode 100644
> > index 000000000000..49fbe2423be0
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
> > +description:
> > + Multifunctional register block found in Tenstorrent Atlantis SoC whose main function
> > + is to control clocks and resets. This Block is instantiated multiple times in the SoC,
>
> Please wrap code according to the preferred limit expressed in Kernel
> coding style (checkpatch is not a coding style description, but only a
> tool). However don't wrap blindly (see Kernel coding style).
Ack.
>
> > + each block controls clock and resets for a different subsystem.
> > +
> > + RCPU syscon serves low speed IO interfaces on chip
> > + PCIe syscon serves all PCIe related functions
> > + HSIO syscon serves high speed IO interfaces (Ethernet, USB)
> > + MM syscon serves GPU, display and video processing functions
>
> Same feedback - clock controllers go to clock, not soc.
>
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - tenstorrent,atlantis-syscon-rcpu
> > + - tenstorrent,atlantis-syscon-pcie
> > + - tenstorrent,atlantis-syscon-mm
> > + - tenstorrent,atlantis-syscon-hsio
>
> Why do you call everything syscon? syscon is not a hardware name. How is
> this exactly called in your datasheet?
I picked the syscon name since the block is a bunch of registers that
control different functions in the SoC. The block's name in the
datasheet is PRCM, so I will stick to that name and treat this node as
a clock controller as its main functionality is that.
> > +
> > +allOf:
> > + - if:
> > + properties:
> > + compatible:
> > + contains:
> > + enum:
> > + - tenstorrent,atlantis-syscon-pcie
> > + - tenstorrent,atlantis-syscon-mm
> > + - tenstorrent,atlantis-syscon-hsio
> > + then:
> > + required:
> > + - tenstorrent,syscon-rcpu
>
> else - properties false, see other examples how to do it.
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + syscon_rcpu: system-controller@a8000000 {
>
> Drop entire example, one is enough.
>
> > + compatible = "tenstorrent,atlantis-syscon-rcpu";
> > + reg = <0xa8000000 0x10000>;
> > + clocks = <&osc_24m>;
> > + #clock-cells = <1>;
> > + #reset-cells = <1>;
> > + };
> > + - |
> > + syscon_hsio: system-controller@e00c0000 {
>
> Drop unused label.
Ack.
> > diff --git a/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
> > new file mode 100644
> > index 000000000000..053cef2b43c8
> > --- /dev/null
> > +++ b/include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
>
> Name will follow bindings.
Ack
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