[PATCH] dt-bindings: usb: samsung,exynos-dwc3: allow unit address in DTS

[Krzysztof Kozlowski]

The Samsung Exynos SoC USB 3.0 DWC3 Controller is a simple wrapper of
actual DWC3 Controller device node.  It handles necessary Samsung
Exynos-specific resources (regulators, clocks), but does not have its
own MMIO address space.

However neither simple-bus bindings nor dtc W=1 accept device nodes in
soc@ node which do not have unit address.  Therefore allow using
the address space of child device (actual DWC3 Controller) as the
wrapper's address.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>

---

DTS fixes are here:
https://lore.kernel.org/linux-samsung-soc/20230125175751.675090-1-krzysztof.kozlowski@xxxxxxxxxx/T/#t
---
 .../devicetree/bindings/usb/samsung,exynos-dwc3.yaml        | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/samsung,exynos-dwc3.yaml b/Documentation/devicetree/bindings/usb/samsung,exynos-dwc3.yaml
index 6b9a3bcb3926..a94b1926dda0 100644
--- a/Documentation/devicetree/bindings/usb/samsung,exynos-dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/samsung,exynos-dwc3.yaml
@@ -29,6 +29,9 @@ properties:
 
   ranges: true
 
+  reg:
+    maxItems: 1
+
   '#size-cells':
     const: 1
 
@@ -108,8 +111,9 @@ examples:
     #include <dt-bindings/clock/exynos5420.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
 
-    usb {
+    usb-wrapper@12000000 {
         compatible = "samsung,exynos5250-dwusb3";
+        reg = <0x12000000 0x10000>;
         #address-cells = <1>;
         #size-cells = <1>;
         ranges;
-- 
2.34.1