[PATCH v4] dt-bindings: sram: convert rockchip-pmu-sram bindings to yaml

[Johan Jonker <jbx6244@xxxxxxxxx>]

Current dts files with 'rockchip-pmu-sram' compatible nodes
are now verified with sram.yaml, although the original
text document still exists. Merge rockchip-pmu-sram.txt
with sram.yaml by adding it as description with an example.
Make #address-cells, #size-cells and ranges optional
if there are no child nodes to prevent yaml warnings.

Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx>
---
Changes v4:
  Make some properties optional

Changes v3:
  Document the compatible

Changed v2:
  Merge with sram.yaml
---
 .../devicetree/bindings/sram/rockchip-pmu-sram.txt | 16 -------------
 Documentation/devicetree/bindings/sram/sram.yaml   | 26 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 19 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sram/rockchip-pmu-sram.txt

diff --git a/Documentation/devicetree/bindings/sram/rockchip-pmu-sram.txt b/Documentation/devicetree/bindings/sram/rockchip-pmu-sram.txt
deleted file mode 100644
index 6b42fda30..000000000
--- a/Documentation/devicetree/bindings/sram/rockchip-pmu-sram.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-Rockchip SRAM for pmu:
-------------------------------
-
-The sram of pmu is used to store the function of resume from maskrom(the 1st
-level loader). This is a common use of the "pmu-sram" because it keeps power
-even in low power states in the system.
-
-Required node properties:
-- compatible : should be "rockchip,rk3288-pmu-sram"
-- reg : physical base address and the size of the registers window
-
-Example:
-	sram@ff720000 {
-		compatible = "rockchip,rk3288-pmu-sram", "mmio-sram";
-		reg = <0xff720000 0x1000>;
-	};
diff --git a/Documentation/devicetree/bindings/sram/sram.yaml b/Documentation/devicetree/bindings/sram/sram.yaml
index 7b83cc6c9..f474fee47 100644
--- a/Documentation/devicetree/bindings/sram/sram.yaml
+++ b/Documentation/devicetree/bindings/sram/sram.yaml
@@ -29,6 +29,7 @@ properties:
       enum:
         - mmio-sram
         - atmel,sama5d2-securam
+        - rockchip,rk3288-pmu-sram
 
   reg:
     maxItems: 1
@@ -118,9 +119,18 @@ patternProperties:
 required:
   - compatible
   - reg
-  - "#address-cells"
-  - "#size-cells"
-  - ranges
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: rockchip,rk3288-pmu-sram
+
+else:
+  required:
+    - "#address-cells"
+    - "#size-cells"
+    - ranges
 
 additionalProperties: false
 
@@ -224,6 +234,16 @@ examples:
     };
 
   - |
+    // Rockchip's rk3288 SoC uses the sram of pmu to store the function of
+    // resume from maskrom(the 1st level loader). This is a common use of
+    // the "pmu-sram" because it keeps power even in low power states
+    // in the system.
+    sram@ff720000 {
+      compatible = "rockchip,rk3288-pmu-sram", "mmio-sram";
+      reg = <0xff720000 0x1000>;
+    };
+
+  - |
     // Allwinner's A80 SoC uses part of the secure sram for hotplugging of the
     // primary core (cpu0). Once the core gets powered up it checks if a magic
     // value is set at a specific location. If it is then the BROM will jump
-- 
2.11.0