[PATCH v2 2/2] dt-bindings: net: add new property st,ext-phyclk in documentation for stm32

[Christophe Roullier <christophe.roullier@foss.st.com>]

Add property st,ext-phyclk to manage cases when PHY have no cristal/quartz
This property can be used with RMII phy without cristal 50Mhz and when we
want to select RCC clock instead of ETH_REF_CLK
Can be used also with RGMII phy with no cristal and we select RCC clock
instead of ETH_CLK125

Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 Documentation/devicetree/bindings/net/stm32-dwmac.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
index 80937b28fa046..529665d4fc911 100644
--- a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
@@ -85,6 +85,13 @@ properties:
   phy-supply:
     description: PHY regulator
 
+  st,ext-phyclk:
+    description:
+      set this property in RMII mode when you have PHY without crystal 50MHz and want to
+      select RCC clock instead of ETH_REF_CLK. OR in RGMII mode when you want to select
+      RCC clock instead of ETH_CLK125.
+    type: boolean
+
   st,eth-clk-sel:
     description:
       set this property in RGMII PHY when you want to select RCC clock instead of ETH_CLK125.
-- 
2.25.1