[PATCH v5 1/9] dt-bindings: arm/npcm: Add binding for global control registers (GCR)

Jonathan Neuschäfer
2022-01-29T11:57:36Z

A nuvoton,*-gcr node is present in nuvoton-common-npcm7xx.dtsi and will
be added to nuvoton-wpcm450.dtsi. It is necessary for the NPCM7xx and
WPCM450 pinctrl drivers, and may later be used to retrieve SoC model and
version information.

This patch adds a binding to describe this node.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Rob Herring <robh@kernel.org>

---
v5:
- no changes

v4:
- Add Rob's R-b

v3:
- Make a few changes suggested by Rob Herring
- Change name of mux-controller node to appease the linter

v2:
- https://lore.kernel.org/lkml/20211207210823.1975632-2-j.neuschaefer@gmx.net/
- Rename node in example to syscon@800000
- Add subnode to example

v1:
- https://lore.kernel.org/lkml/20210602120329.2444672-2-j.neuschaefer@gmx.net/
---
.../bindings/arm/npcm/nuvoton,gcr.yaml | 48 +++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml

diff --git a/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml b/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
new file mode 100644
index 0000000000000..fcb211add7d37
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/npcm/nuvoton,gcr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Global Control Registers block in Nuvoton SoCs
+
+maintainers:
+ - Jonathan Neuschäfer <j.neuschaefer@gmx.net>
+
+description:
+ The Global Control Registers (GCR) are a block of registers in Nuvoton SoCs
+ that expose misc functionality such as chip model and version information or
+ pinmux settings.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - nuvoton,wpcm450-gcr
+ - nuvoton,npcm750-gcr
+ - const: syscon
+ - const: simple-mfd
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+additionalProperties:
+ type: object
+
+examples:
+ - |
+ gcr: syscon@800000 {
+ compatible = "nuvoton,npcm750-gcr", "syscon", "simple-mfd";
+ reg = <0x800000 0x1000>;
+
+ mux-controller {
+ compatible = "mmio-mux";
+ #mux-control-cells = <1>;
+ mux-reg-masks = <0x38 0x07>;
+ idle-states = <2>;
+ };
+ };
--
2.34.1