linux-kernel - [PATCH v2 1/2] dt-bindings: nvmem: Add apple,efuses

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Message-Id: <20220306121816.70537-1-sven@svenpeter.dev>
Date:   Sun,  6 Mar 2022 13:18:15 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Sven Peter <sven@...npeter.dev>,
        Krzysztof Kozlowsk <krzysztof.kozlowski@...onical.com>,
        Joey Gouly <joey.gouly@....com>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: nvmem: Add apple,efuses

Apple SoCs come with eFuses used to store factory-programmed data
such as calibration settings for the PCIe and Type-C PHY.

Signed-off-by: Sven Peter <sven@...npeter.dev>
---
v1 -> v2:
  - fixed indentation issue pointed out by Krzysztof Kozlowski

 .../bindings/nvmem/apple,efuses.yaml          | 50 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/apple,efuses.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml b/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml
new file mode 100644
index 000000000000..5ec8f2bdb3a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/apple,efuses.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple SoC eFuse-based NVMEM
+
+description: |
+  Apple SoCs such as the M1 contain factory-programmed eFuses used to e.g. store
+  calibration data for the PCIe and the Type-C PHY or unique chip identifiers
+  such as the ECID.
+
+maintainers:
+  - Sven Peter <sven@...npeter.dev>
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8103-efuses
+          - apple,t6000-efuses
+      - const: apple,efuses
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    efuse@...bc000 {
+        compatible = "apple,t8103-efuses", "apple,efuses";
+        reg = <0x3d2bc000 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        ecid: efuse@500 {
+            reg = <0x500 0x8>;
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 05fd080b82f3..f70d8525cbd4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1771,6 +1771,7 @@ F:	Documentation/devicetree/bindings/arm/apple/*
 F:	Documentation/devicetree/bindings/i2c/apple,i2c.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
 F:	Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
+F:	Documentation/devicetree/bindings/nvmem/apple,efuses.yaml
 F:	Documentation/devicetree/bindings/pci/apple,pcie.yaml
 F:	Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
 F:	Documentation/devicetree/bindings/power/apple*
-- 
2.25.1