linux-kernel - [PATCH 2/2] dt-bindings: edac: Aspeed AST2500

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Message-Id: <1545026517-64069-3-git-send-email-schaecsn@gmx.net>
Date:   Sun, 16 Dec 2018 22:01:57 -0800
From:   Stefan Schaeckeler <schaecsn@....net>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-edac@...r.kernel.org
Cc:     Stefan M Schaeckeler <sschaeck@...co.com>
Subject: [PATCH 2/2] dt-bindings: edac: Aspeed AST2500

From: Stefan M Schaeckeler <sschaeck@...co.com>

Add support for the Aspeed AST2500 SoC EDAC driver.

Signed-off-by: Stefan M Schaeckeler <sschaeck@...co.com>
---
 .../bindings/edac/aspeed-sdram-edac.txt       | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt

diff --git a/Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt b/Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt
new file mode 100644
index 000000000000..57ba852883c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt
@@ -0,0 +1,34 @@
+Aspeed AST2500 SoC EDAC device driver
+
+The Aspeed AST2500 SoC supports DDR3 and DDR4 memory with and without ECC (error
+correction check).
+
+The memory controller supports SECDED (single bit error correction, double bit
+error detection) and single bit error auto scrubbing by reserving 8 bits for
+every 64 bit word (effectively reducing available memory to 8/9).
+
+First, ECC must be configured in u-boot. Then, this driver will expose error
+counters via the edac kernel framework.
+
+A note on memory organization in ECC mode: every 512 bytes are followed by 64
+bytes of ECC codes. The address remapping is done in hardware and is fully
+transparent to firmware and software. Because of this, ECC mode must be
+configured in u-boot as part of the memory initialization as one can not switch
+from one mode to another when executing in memory.
+
+
+
+Required properties:
+- compatible: should be "aspeed,ast2500-sdram-edac"
+- reg:        sdram controller register set should be <0x1e6e0000 0x174>
+- interrupts: should be AVIC interrupt #0
+
+
+Example:
+
+	edac: sdram@...e0000 {
+		compatible = "aspeed,ast2500-sdram-edac";
+		reg = <0x1e6e0000 0x174>;
+		interrupts = <0>;
+		status = "okay";
+	};
-- 
2.19.1