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

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Date:   Wed, 25 Jan 2023 18:59:43 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH] dt-bindings: usb: samsung,exynos-dwc3: allow unit address in DTS

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@...aro.org>

---

DTS fixes are here:
https://lore.kernel.org/linux-samsung-soc/20230125175751.675090-1-krzysztof.kozlowski@linaro.org/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@...00000 {
         compatible = "samsung,exynos5250-dwusb3";
+        reg = <0x12000000 0x10000>;
         #address-cells = <1>;
         #size-cells = <1>;
         ranges;
-- 
2.34.1