linux-kernel - [PATCH v2 1/6] dt-bindings: mfd: add bindings for QIXIS CPLD

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Message-Id: <20250509152940.2004660-2-ioana.ciornei@nxp.com>
Date: Fri,  9 May 2025 18:29:35 +0300
From: Ioana Ciornei <ioana.ciornei@....com>
To: lee@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: vladimir.oltean@....com,
	Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH v2 1/6] dt-bindings: mfd: add bindings for QIXIS CPLD

This adds device tree bindings for the board management controller -
QIXIS CPLD - found on some Layerscape based boards such as LX2162A-QDS,
LX2160AQDS, LS1028AQDS etc.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
Changes in v2:
- renamed the compatible strings so that it does not mention the i2c
  part, which is redundant
- remove the description from the reg property
- reordered the properties when mentioned in the required section
- updated the example so that it actually reflects the expected DT


 .../mfd/fsl,ls1028a-qds-qixis-cpld.yaml       | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/fsl,ls1028a-qds-qixis-cpld.yaml

diff --git a/Documentation/devicetree/bindings/mfd/fsl,ls1028a-qds-qixis-cpld.yaml b/Documentation/devicetree/bindings/mfd/fsl,ls1028a-qds-qixis-cpld.yaml
new file mode 100644
index 000000000000..cf4cd91d9580
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/fsl,ls1028a-qds-qixis-cpld.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/fsl,ls1028a-qds-qixis-cpld.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP's QIXIS CPLD board management controller
+
+maintainers:
+  - Ioana Ciornei <ioana.ciornei@....com>
+
+description: |
+  The board management controller found on some Layerscape boards contains
+  different IP blocks like GPIO controllers, interrupt controllers, reg-muxes
+  etc. The QIXIS CPLD on these boards presents itself as an I2C device.
+
+properties:
+  compatible:
+    enum:
+      - fsl,ls1028a-qds-qixis-cpld
+      - fsl,lx2160a-qds-qixis-cpld
+      - fsl,lx2162a-qds-qixis-cpld
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  '^mux-controller(@[a-f0-9]+)?$':
+    $ref: /schemas/mux/reg-mux.yaml#
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        cpld@66 {
+            compatible = "fsl,lx2160a-qds-qixis-cpld";
+            reg = <0x66>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            mux: mux-controller@54 {
+                compatible = "reg-mux";
+                reg = <0x54>;
+                #mux-control-cells = <1>;
+                mux-reg-masks = <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */
+                                <0x54 0x07>; /* 1: reg 0x54, bit 2:0 */
+            };
+        };
+    };
-- 
2.25.1