[PATCH 1/3] dt-bindings: hwmon: jedec,spd5118: Add bindings

From: Guenter Roeck
Date: Wed May 29 2024 - 16:52:26 EST


Add device tree bindings for the SPD hub present in DDR5 modules.

Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
I am not sure about the "pec-enable" property since it is not really
a chip property but a SMBus property. It is also not chip specific;
there are other chips with the capability to enable or disable PEC
support. There are no generic SMBus bindings, though, so I don't know
a better place (or name - maybe it should be 'smbus,pec-enable', but
there are no other similar bindings, or at least I didn't find any).

.../bindings/hwmon/jedec,spd5118.yaml | 52 +++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/jedec,spd5118.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/jedec,spd5118.yaml b/Documentation/devicetree/bindings/hwmon/jedec,spd5118.yaml
new file mode 100644
index 000000000000..1717f75129da
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/jedec,spd5118.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/jedec,spd5118.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: JEDEC JESD300-5B (SPD5118) compatible DDR5 SPD hub
+
+maintainers:
+ - Guenter Roeck <linux@xxxxxxxxxxxx>
+
+description: |
+ JEDEC JESD300-5B.01 SPD5118 Hub and Serial Presence Detect
+ https://www.jedec.org/standards-documents/docs/jesd300-5b01
+
+select:
+ properties:
+ compatible:
+ const: jedec,spd5118
+
+ required:
+ - compatible
+ - reg
+
+properties:
+ compatible:
+ const: jedec,spd5118
+
+ reg:
+ maxItems: 1
+
+ pec-enable:
+ description: Set to enable PEC (Packet Error Checking).
+ type: boolean
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ temp-sensor@51 {
+ compatible = "jedec,spd5118";
+ reg = <0x51>;
+ };
+ };
--
2.39.2