dt-bindings: mips: brcm: Document brcm,bmips-cbr-reg property

Document brcm,bmips-cbr-reg property.

Some SoC suffer from a BUG where CBR(Core Base Register)
address might be badly or never initialized by the Bootloader
or reading it from co-processor registers, if the system boots
from secondary CPU, results in invalid address.

The CBR address is always the same on the SoC.

Usage of this property is to give an address also in these broken
configuration/bootloader.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/Documentation/devicetree/bindings/mips/brcm/soc.yaml b/Documentation/devicetree/bindings/mips/brcm/soc.yaml
index 975945ca28881689cc691497a59cf8d2fa875465..0cc634482a6a8337d6551433029a8721e7be66a4 100644 (file)
--- a/Documentation/devicetree/bindings/mips/brcm/soc.yaml
+++ b/Documentation/devicetree/bindings/mips/brcm/soc.yaml
@@ -55,6 +55,16 @@ properties:
          under the "cpus" node.
         $ref: /schemas/types.yaml#/definitions/uint32
 
+      brcm,bmips-cbr-reg:
+        description: Reference address of the CBR.
+          Some SoC suffer from a BUG where CBR(Core Base Register)
+          address might be badly or never initialized by the Bootloader
+          or reading it from co-processor registers, if the system boots
+          from secondary CPU, results in invalid address.
+          The CBR address is always the same on the SoC hence it
+          can be provided in DT to handle these broken case.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
     patternProperties:
       "^cpu@[0-9]$":
         type: object
@@ -64,6 +74,20 @@ properties:
     required:
       - mips-hpt-frequency
 
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - brcm,bcm6358
+          - brcm,bcm6368
+
+then:
+  properties:
+    cpus:
+      required:
+        - brcm,bmips-cbr-reg
+
 additionalProperties: true
 
 examples: