[PATCH v1 04/11] dt-bindings: soc: microchip: document the two simple-mfd syscons on PolarFire SoC

[Conor Dooley <conor@kernel.org>]

From: Conor Dooley <conor.dooley@microchip.com>

There are two syscons on PolarFire SoC that provide various functionality of
use to the OS.

The first of these is the "control-scb" region, that contains the "tvs"
temperature and voltage sensors and the control/status registers for the
system controller's mailbox. The mailbox has a dedicated node, so
there's no need for a child node describing it, looking the syscon up by
compatible is sufficient.

The second, "mss-top-sysreg", contains clocks, pinctrl, resets, and
interrupt controller and more. At this point, only the reset controller
child is described as that's all that is described by the existing
bindings. The clock controller already has a dedicated node, and will
retain it as there are other clock regions, so like the mailbox,
a compatible-based lookup of the syscon is sufficient to keep the clock
driver working as before so no child is needed. There's also an
interrupt multiplexing service provided by this syscon, for which there
is work in progress at [1].

Link: https://lore.kernel.org/linux-gpio/20240723-uncouple-enforcer-7c48e4a4fefe@wendy/ [1]
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../microchip/microchip,mpfs-control-scb.yaml | 44 +++++++++++++++
 .../microchip,mpfs-mss-top-sysreg.yaml        | 54 +++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
 create mode 100644 Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml

diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
new file mode 100644
index 0000000000000..4f9168320243c
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-control-scb.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/microchip/microchip,mpfs-control-scb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PolarFire SoC System Controller Bus (SCB) Control Register region
+
+maintainers:
+  - Conor Dooley <conor.dooley@microchip.com>
+
+description:
+  An assortment of system controller related registers, including voltage and
+  temperature sensors and the status/control registers for the system
+  controller's mailbox.
+
+properties:
+  compatible:
+    items:
+      - const: microchip,mpfs-control-scb
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      syscon@37020000 {
+        compatible = "microchip,mpfs-control-scb", "syscon", "simple-mfd";
+        reg = <0x37020000 0x100>;
+      };
+    };
+
diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
new file mode 100644
index 0000000000000..98ccec3caad51
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PolarFire SoC Microprocessor Subsystem (MSS) sysreg Register region
+
+maintainers:
+  - Conor Dooley <conor.dooley@microchip.com>
+
+description:
+  An wide assortment of registers that control elements of the MSS on PolarFire
+  SoC, including pinmuxing, resets and clocks among others.
+
+properties:
+  compatible:
+    items:
+      - const: microchip,mpfs-mss-top-sysreg
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  '#reset-cells':
+    description: |
+      The AHB/AXI peripherals on the PolarFire SoC have reset support, so
+      from CLK_ENVM to CLK_CFM. The reset consumer should specify the
+      desired peripheral via the clock ID in its "resets" phandle cell.
+      See include/dt-bindings/clock/microchip,mpfs-clock.h for the full list
+      of PolarFire clock/reset IDs.
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      syscon@20002000 {
+        compatible = "microchip,mpfs-mss-top-sysreg", "syscon", "simple-mfd";
+        reg = <0x20002000 0x1000>;
+        #reset-cells = <1>;
+      };
+    };
+
-- 
2.45.2