[PATCH v2 14/19] dt-bindings: memory: snps: Detach Zynq DDRC controller support

[Serge Semin]

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 <Sergey.Semin at baikalelectronics.ru>

---

Changelog v2:
- Move Synopsys DW uMCTL2 DDRC bindings file renaming to a separate
  patch. (@Krzysztof)
---
 .../memory-controllers/synopsys,ddrc-ecc.yaml | 63 ++++++-------------
 .../xlnx,zynq-ddrc-a05.yaml                   | 38 +++++++++++
 MAINTAINERS                                   |  1 +
 3 files changed, 59 insertions(+), 43 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/xlnx,zynq-ddrc-a05.yaml

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 <krzk at kernel.org>
@@ -12,21 +12,22 @@ maintainers:
   - Michal Simek <michal.simek at xilinx.com>
 
 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 at f8006000 {
-        compatible = "xlnx,zynq-ddrc-a05";
-        reg = <0xf8006000 0x1000>;
-    };
-
-  - |
-    axi {
-        #address-cells = <2>;
-        #size-cells = <2>;
-
-        memory-controller at fd070000 {
-            compatible = "xlnx,zynqmp-ddrc-2.40a";
-            reg = <0x0 0xfd070000 0x0 0x30000>;
-            interrupt-parent = <&gic>;
-            interrupts = <0 112 4>;
-        };
+    memory-controller at 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 <krzk at kernel.org>
+  - Manish Narani <manish.narani at xilinx.com>
+  - Michal Simek <michal.simek at xilinx.com>
+
+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 at f8006000 {
+      compatible = "xlnx,zynq-ddrc-a05";
+      reg = <0xf8006000 0x1000>;
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 9d7f64dc0efe..40e1a146ca61 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
-- 
2.37.2