[PATCH v8 01/10] dt-bindings: mfd: add support for the NXP SIUL2 module
Rob Herring
robh at kernel.org
Tue Jan 20 18:19:13 PST 2026
On Tue, Jan 20, 2026 at 01:59:13PM +0200, Khristine Andreea Barbulescu wrote:
> From: Andrei Stefanescu <andrei.stefanescu at oss.nxp.com>
>
> Add the new dt-bindings for the NXP SIUL2 module which is a multi
> function device. It can export information about the SoC, configure
> the pinmux&pinconf for pins and it is also a GPIO controller with
> interrupt capability.
>
> The existing SIUL2 pinctrl bindings becomes deprecated because it
> do not correctly describe the hardware. The SIUL2 module also
> offers GPIO control and exposes some registers which contain
> information about the SoC. Adding drivers for these functionalities
> would result in incorrect bindings with a lot of carved out regions
> for registers.
>
> SIUL2 is a complex module that spans multiple register regions
> and provides several functions: pinmux and pin configuration
> through MSCR and IMCR registers, GPIO control through PGPDO
> and PGPDI registers, interrupt configuration registers,
> and SoC identification registers (MIDR).
> These registers are grouped under two instances, SIUL2_0 and
> SIUL2_1, and share the same functional context. The legacy
> binding models SIUL2 as a standalone pinctrl node, which only
> covers MSCR and IMCR.
>
> Signed-off-by: Andrei Stefanescu <andrei.stefanescu at oss.nxp.com>
> Signed-off-by: Khristine Andreea Barbulescu <khristineandreea.barbulescu at oss.nxp.com>
> ---
> .../bindings/mfd/nxp,s32g2-siul2.yaml | 165 ++++++++++++++++++
> .../pinctrl/nxp,s32g2-siul2-pinctrl.yaml | 2 +
> 2 files changed, 167 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/nxp,s32g2-siul2.yaml
Doesn't look like this was tested...
>
> diff --git a/Documentation/devicetree/bindings/mfd/nxp,s32g2-siul2.yaml b/Documentation/devicetree/bindings/mfd/nxp,s32g2-siul2.yaml
> new file mode 100644
> index 000000000000..ec743cf5f73e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/nxp,s32g2-siul2.yaml
> @@ -0,0 +1,165 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2024 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/nxp,s32g2-siul2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP S32 System Integration Unit Lite2 (SIUL2)
> +
> +maintainers:
> + - Andrei Stefanescu <andrei.stefanescu at oss.nxp.com>
> +
> +description: |
> + SIUL2 is a hardware block which implements pinmuxing,
> + pinconf, GPIOs (some with interrupt capability) and
> + registers which contain information about the SoC.
> + There are generally two SIUL2 modules whose functionality
> + is grouped together. For example interrupt configuration
> + registers are part of SIUL2_1 even though interrupts are
> + also available for SIUL2_0 pins.
> +
> + The following register types are exported by SIUL2:
> + - MIDR (MCU ID Register) - information related to the SoC
> + - interrupt configuration registers
> + - MSCR (Multiplexed Signal Configuration Register) - pinmuxing and pinconf
> + - IMCR (Input Multiplexed Signal Configuration Register)- pinmuxing
> + - PGPDO (Parallel GPIO Pad Data Out Register) - GPIO output value
> + - PGPDI (Parallel GPIO Pad Data In Register) - GPIO input value
> +
> + Most registers are 32bit wide with the exception of PGPDO/PGPDI which are
> + 16bit wide.
> +
> +properties:
> + compatible:
> + oneOf:
> + - const: nxp,s32g2-siul2
> + - items:
> + - enum:
> + - nxp,s32g3-siul2
> + - const: nxp,s32g2-siul2
> +
> + gpio-controller: true
> +
> + "#gpio-cells":
> + const: 2
> +
> + gpio-ranges:
> + maxItems: 2
> +
> + interrupts:
> + maxItems: 1
> +
> + interrupt-controller: true
> +
> + "#interrupt-cells":
> + const: 2
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 1
> +
> + ranges:
> + description: Address translation ranges for child nodes.
> +
> +
> +patternProperties:
> + "^siul2_[0-1]$":
Don't use '_'.
> + type: object
> + description: SIUL2 hardware instances represented as syscon.
> + properties:
> + compatible:
> + const: syscon
'syscon' alone is not allowed.
> + reg:
> + maxItems: 1
You have 'reg' so the node name should have unit-address.
However, there's not any real DT resources in this child node, so you
should just drop it.
> + required:
> + - compatible
> + - reg
> +
> + "-hog(-[0-9]+)?$":
> + required:
> + - gpio-hog
> +
> + "-pins$":
> + type: object
> + additionalProperties: false
> +
> + patternProperties:
> + "-grp[0-9]$":
> + type: object
> + allOf:
> + - $ref: /schemas/pinctrl/pinmux-node.yaml#
> + - $ref: /schemas/pinctrl/pincfg-node.yaml#
> + description:
> + Pinctrl node's client devices specify pin muxes using subnodes,
> + which in turn use the standard properties below.
> +
> + properties:
> + pinmux:
> + description: |
> + An integer array for representing pinmux configurations of
> + a device. Each integer consists of a PIN_ID and a 4-bit
> + selected signal source(SSS) as IOMUX setting, which is
> + calculated as: pinmux = (PIN_ID << 4 | SSS)
> +
> + slew-rate:
> + description: Supported slew rate based on Fmax values (MHz)
> + enum: [83, 133, 150, 166, 208]
> + required:
> + - pinmux
> +
> + unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - gpio-controller
> + - "#gpio-cells"
> + - gpio-ranges
> + - interrupts
> + - interrupt-controller
> + - "#interrupt-cells"
> + - "#address-cells"
> + - "#size-cells"
> + - ranges
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/interrupt-controller/irq.h>
> +
> + pinctrl at 4009c000 {
> + compatible = "nxp,s32g2-siul2";
> + gpio-controller;
> + #gpio-cells = <2>;
> + gpio-ranges = <&siul2 0 0 102>, <&siul2 112 112 79>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + interrupts = <GIC_SPI 210 IRQ_TYPE_LEVEL_HIGH>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + siul2_0: siul2_0 at 4009c000 {
> + compatible = "syscon";
> + reg = <0x0 0x4009c000 0x0 0x179c>;
> + };
> +
> + siul2_1: siul2_1 at 44010000 {
> + compatible = "syscon";
> + reg = <0x0 0x44010000 0x0 0x17b0>;
> + };
> +
> + jtag-pins {
> + jtag-grp0 {
> + pinmux = <0x0>;
> + input-enable;
> + bias-pull-up;
> + slew-rate = <166>;
> + };
> + };
> + };
> +...
> diff --git a/Documentation/devicetree/bindings/pinctrl/nxp,s32g2-siul2-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/nxp,s32g2-siul2-pinctrl.yaml
> index a24286e4def6..332397a21394 100644
> --- a/Documentation/devicetree/bindings/pinctrl/nxp,s32g2-siul2-pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/nxp,s32g2-siul2-pinctrl.yaml
> @@ -11,6 +11,8 @@ maintainers:
> - Ghennadi Procopciuc <Ghennadi.Procopciuc at oss.nxp.com>
> - Chester Lin <chester62515 at gmail.com>
>
> +deprecated: true
> +
I don't really see why you can't just extend this binding with GPIO and
interrupt provider properties.
Rob
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