linux-kernel - [PATCH v7 1/2] schemas: memory: Add ECC properties

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Message-ID: <20230926194242.2732127-1-sjg@chromium.org>
Date:   Tue, 26 Sep 2023 13:42:38 -0600
From:   Simon Glass <sjg@...omium.org>
To:     devicetree@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>,
        Lean Sheng Tan <sheng.tan@...ements.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Dhaval Sharma <dhaval@...osinc.com>,
        Maximilian Brune <maximilian.brune@...ements.com>,
        Yunhui Cui <cuiyunhui@...edance.com>,
        Guo Dong <guo.dong@...el.com>, Tom Rini <trini@...sulko.com>,
        ron minnich <rminnich@...il.com>, Gua Guo <gua.guo@...el.com>,
        Chiu Chasel <chasel.chiu@...el.com>,
        linux-acpi@...r.kernel.org,
        U-Boot Mailing List <u-boot@...ts.denx.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Simon Glass <sjg@...omium.org>
Subject: [PATCH v7 1/2] schemas: 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 v7:
- Drop unnecessary |
- Add a blank line between properties

Changes in v6:
- Use a number of bits instead of a string property
- Fix inidcates typo

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 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dtschema/schemas/memory.yaml b/dtschema/schemas/memory.yaml
index 1d74410..b3bf3c9 100644
--- a/dtschema/schemas/memory.yaml
+++ b/dtschema/schemas/memory.yaml
@@ -35,6 +35,19 @@ patternProperties:
           For the purpose of identification, each NUMA node is associated with
           a unique token known as a node id.
 
+      ecc-detection-bits:
+        default: 0
+        description: |
+          If present, this indicates the number of bits of memory error which
+          can be detected and reported by the Error-Correction Code (ECC) memory
+          subsystem (typically 0, 1 or 2).
+
+      ecc-correction-bits:
+        default: 0
+        description: |
+          If present, this indicates the number of bits of memory error which
+          can be corrected by the Error-Correction Code (ECC) memory subsystem
+          (typically 0, 1 or 2).
 
     required:
       - device_type
-- 
2.42.0.515.g380fc7ccd1-goog