linux-kernel - [PATCH v5 4/4] memory: Add ECC properties

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Message-ID: <20230830231758.2561402-4-sjg@chromium.org>
Date:   Wed, 30 Aug 2023 17:17:52 -0600
From:   Simon Glass <sjg@...omium.org>
To:     devicetree@...r.kernel.org
Cc:     Maximilian Brune <maximilian.brune@...ements.com>,
        ron minnich <rminnich@...il.com>,
        Tom Rini <trini@...sulko.com>,
        Dhaval Sharma <dhaval@...osinc.com>,
        U-Boot Mailing List <u-boot@...ts.denx.de>,
        Mark Rutland <mark.rutland@....com>,
        Yunhui Cui <cuiyunhui@...edance.com>,
        linux-acpi@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Gua Guo <gua.guo@...el.com>,
        Lean Sheng Tan <sheng.tan@...ements.com>,
        Guo Dong <guo.dong@...el.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        Chiu Chasel <chasel.chiu@...el.com>,
        Simon Glass <sjg@...omium.org>
Subject: [PATCH v5 4/4] memory: Add ECC properties

Some memories provide ECC detection and/or correction. For software which
wants to check memory, it is helpful to see which regions provide this
feature.

Add this as a property of the /memory nodes, since it presumably follows
the hardware-level memory system.

Signed-off-by: Simon Glass <sjg@...omium.org>
---

Changes in v5:
- Redo to make this property specific to ECC
- Provide properties both for detection and correction

Changes in v3:
- Add new patch to update the /memory nodes

 dtschema/schemas/memory.yaml | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/dtschema/schemas/memory.yaml b/dtschema/schemas/memory.yaml
index 1d74410..944aa9f 100644
--- a/dtschema/schemas/memory.yaml
+++ b/dtschema/schemas/memory.yaml
@@ -34,7 +34,37 @@ patternProperties:
         description:
           For the purpose of identification, each NUMA node is associated with
           a unique token known as a node id.
+      ecc-detection:
+        $ref: /schemas/types.yaml#/definitions/string
+        enum:
+          - none
+          - single-bit
+          - multi-bit
+        description: |
+          If present, this inidcates the type of memory errors which can be
+          detected and reported by the Error-Correction Code (ECC) memory
+          subsystem:
 
+            none       - No error detection is possible
+            single-bit - Detects and reports single-bit ECC errors
+            multi-bit  - Detects and reports multiple-bit ECC errors
+
+          If not present, this is equivalent to 'none'.
+      ecc-correction:
+        $ref: /schemas/types.yaml#/definitions/string
+        enum:
+          - none
+          - single-bit
+          - multi-bit
+        description: |
+          If present, this inidcates the type of memory errors which can be
+          corrected by the Error-Correction Code (ECC) memory subsystem:
+
+            none       - No error correction is possible
+            single-bit - Corrects single-bit ECC errors
+            multi-bit  - Corrects multiple-bit ECC errors
+
+          If not present, this is equivalent to 'none'.
 
     required:
       - device_type
-- 
2.42.0.rc2.253.gd59a3bf2b4-goog