dt-bindings: memory: synopsys,ddrc-ecc: Detach Zynq DDRC controller support

The Zynq A05 DDRC controller has nothing in common with DW uMCTL2 DDRC:
the CSRs layout is absolutely different and it doesn't support IRQs unlike
DW uMCTL2 DDR controller of all versions (v1.x, v2.x and v3.x). Thus there
is no any reason to have these controllers described in the same bindings.
Let's split the DT-schema up.

Note since the synopsys,ddrc-ecc.yaml schema describes the Synopsys DW
uMCTL2 DDR controller only, we need to accordingly fix the device
descriptions.

Signed-off-by: Serge Semin <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

3 files changed, 59 insertions, 43 deletions

diff --git a/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml b/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml
index f46e95704f53..0be8ecc73d1a 100644
--- a/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/memory-controllers/synopsys,ddrc-ecc.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Synopsys IntelliDDR Multi Protocol memory controller
+title: Synopsys DesignWare Universal Multi-Protocol Memory Controller
 
 maintainers:
   - Krzysztof Kozlowski <[email protected]>
@@ -12,21 +12,22 @@ maintainers:
   - Michal Simek <[email protected]>
 
 description: |
-  The ZynqMP DDR ECC controller has an optional ECC support in 64-bit and
-  32-bit bus width configurations.
+  Synopsys DesignWare Enhanced uMCTL2 DDR Memory Controller is capable of
+  working with the memory devices supporting up to (LP)DDR4 protocol. It can
+  be equipped with SEC/DEC ECC feature if DRAM data bus width is either
+  16-bits or 32-bits or 64-bits wide.
 
-  The Zynq DDR ECC controller has an optional ECC support in half-bus width
-  (16-bit) configuration.
-
-  These both ECC controllers correct single bit ECC errors and detect double bit
-  ECC errors.
+  For instance the ZynqMP DDR controller is based on the DW uMCTL2 v2.40a
+  controller. It has an optional SEC/DEC ECC support in 64- and 32-bits
+  bus width configurations.
 
 properties:
   compatible:
-    enum:
-      - snps,ddrc-3.80a
-      - xlnx,zynq-ddrc-a05
-      - xlnx,zynqmp-ddrc-2.40a
+    oneOf:
+      - description: Synopsys DW uMCTL2 DDR controller v3.80a
+        const: snps,ddrc-3.80a
+      - description: Xilinx ZynqMP DDR controller v2.40a
+        const: xlnx,zynqmp-ddrc-2.40a
 
   interrupts:
     maxItems: 1
@@ -37,40 +38,16 @@ properties:
 required:
   - compatible
   - reg
-
-allOf:
-  - if:
-      properties:
-        compatible:
-          contains:
-            enum:
-              - snps,ddrc-3.80a
-              - xlnx,zynqmp-ddrc-2.40a
-    then:
-      required:
-        - interrupts
-    else:
-      properties:
-        interrupts: false
+  - interrupts
 
 additionalProperties: false
 
 examples:
   - |
-    memory-controller@f8006000 {
-        compatible = "xlnx,zynq-ddrc-a05";
-        reg = <0xf8006000 0x1000>;
-    };
-
-  - |
-    axi {
-        #address-cells = <2>;
-        #size-cells = <2>;
-
-        memory-controller@fd070000 {
-            compatible = "xlnx,zynqmp-ddrc-2.40a";
-            reg = <0x0 0xfd070000 0x0 0x30000>;
-            interrupt-parent = <&gic>;
-            interrupts = <0 112 4>;
-        };
+    memory-controller@fd070000 {
+      compatible = "xlnx,zynqmp-ddrc-2.40a";
+      reg = <0xfd070000 0x30000>;
+      interrupt-parent = <&gic>;
+      interrupts = <0 112 4>;
     };
+...
diff --git a/Documentation/devicetree/bindings/memory-controllers/xlnx,zynq-ddrc-a05.yaml b/Documentation/devicetree/bindings/memory-controllers/xlnx,zynq-ddrc-a05.yaml
new file mode 100644
index 000000000000..8f72e2f8588a
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/xlnx,zynq-ddrc-a05.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/xlnx,zynq-ddrc-a05.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Zynq A05 DDR Memory Controller
+
+maintainers:
+  - Krzysztof Kozlowski <[email protected]>
+  - Manish Narani <[email protected]>
+  - Michal Simek <[email protected]>
+
+description:
+  The Zynq DDR ECC controller has an optional ECC support in half-bus width
+  (16-bit) configuration. It is cappable of correcting single bit ECC errors
+  and detecting double bit ECC errors.
+
+properties:
+  compatible:
+    const: xlnx,zynq-ddrc-a05
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    memory-controller@f8006000 {
+      compatible = "xlnx,zynq-ddrc-a05";
+      reg = <0xf8006000 0x1000>;
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 8a5012ba6ff9..1d51bdb5143e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3087,6 +3087,7 @@ W:	http://wiki.xilinx.com
 T:	git https://github.com/Xilinx/linux-xlnx.git
 F:	Documentation/devicetree/bindings/i2c/cdns,i2c-r1p10.yaml
 F:	Documentation/devicetree/bindings/i2c/xlnx,xps-iic-2.00.a.yaml
+F:	Documentation/devicetree/bindings/memory-controllers/xlnx,zynq-ddrc-a05.yaml
 F:	Documentation/devicetree/bindings/spi/xlnx,zynq-qspi.yaml
 F:	arch/arm/mach-zynq/
 F:	drivers/clocksource/timer-cadence-ttc.c