EDAC, aspeed: Add an Aspeed AST2500 EDAC driver

Add support for the Aspeed AST2500 SoC.
Signed-off-by: Stefan M Schaeckeler <sschaeck@cisco.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Jeffery <andrew@aj.id.au>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-aspeed@lists.ozlabs.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: https://lkml.kernel.org/r/1547743097-5236-2-git-send-email-schaecsn@gmx.net

MAINTAINERS

@@ -5396,6 +5396,12 @@ L:	linux-edac@vger.kernel.org
 S:	Maintained
 F:	drivers/edac/amd64_edac*
 
+EDAC-AST2500
+M:	Stefan Schaeckeler <sschaeck@cisco.com>
+S:	Supported
+F:	drivers/edac/aspeed_edac.c
+F:	Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt
+
 EDAC-CALXEDA
 M:	Robert Richter <rric@kernel.org>
 L:	linux-edac@vger.kernel.org

arch/arm/boot/dts/aspeed-g5.dtsi

@@ -47,6 +47,13 @@ memory@80000000 {
 		reg = <0x80000000 0>;
 	};
 
+	edac: sdram@1e6e0000 {
+		compatible = "aspeed,ast2500-sdram-edac";
+		reg = <0x1e6e0000 0x174>;
+		interrupts = <0>;
+		status = "disabled";
+	};
+
 	ahb {
 		compatible = "simple-bus";
 		#address-cells = <1>;

drivers/edac/Kconfig

@@ -475,4 +475,13 @@ config EDAC_QCOM
 	  For debugging issues having to do with stability and overall system
 	  health, you should probably say 'Y' here.
 
+config EDAC_ASPEED
+	tristate "Aspeed AST 2500 SoC"
+	depends on MACH_ASPEED_G5
+	help
+	  Support for error detection and correction on the Aspeed AST 2500 SoC.
+
+	  First, ECC must be configured in the bootloader. Then, this driver
+	  will expose error counters via the EDAC kernel framework.
+
 endif # EDAC

drivers/edac/Makefile

@@ -78,3 +78,4 @@ obj-$(CONFIG_EDAC_SYNOPSYS)		+= synopsys_edac.o
 obj-$(CONFIG_EDAC_XGENE)		+= xgene_edac.o
 obj-$(CONFIG_EDAC_TI)			+= ti_edac.o
 obj-$(CONFIG_EDAC_QCOM)			+= qcom_edac.o
+obj-$(CONFIG_EDAC_ASPEED)		+= aspeed_edac.o