[PATCH v4 1/3] dt-bindings: net: add reset property for aspeed, ast2600-mdio binding

Dylan Hung dylan_hung at aspeedtech.com
Tue Apr 12 16:56:09 AEST 2022


The AST2600 MDIO bus controller has a reset control bit and must be
deasserted before manipulating the MDIO controller. By default, the
hardware asserts the reset so the driver only need to deassert it.

Regarding to the old DT blobs which don't have reset property in them,
the reset deassertion is usually done by the bootloader so the reset
property is optional to work with them.

Signed-off-by: Dylan Hung <dylan_hung at aspeedtech.com>
Reviewed-by: Krzysztof Kozlowski <krzk at kernel.org>
---
 .../devicetree/bindings/net/aspeed,ast2600-mdio.yaml         | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml b/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
index 1c88820cbcdf..1174c14898e1 100644
--- a/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
+++ b/Documentation/devicetree/bindings/net/aspeed,ast2600-mdio.yaml
@@ -20,10 +20,14 @@ allOf:
 properties:
   compatible:
     const: aspeed,ast2600-mdio
+
   reg:
     maxItems: 1
     description: The register range of the MDIO controller instance
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -39,6 +43,7 @@ examples:
             reg = <0x1e650000 0x8>;
             #address-cells = <1>;
             #size-cells = <0>;
+            resets = <&syscon ASPEED_RESET_MII>;
 
             ethphy0: ethernet-phy at 0 {
                     compatible = "ethernet-phy-ieee802.3-c22";
-- 
2.25.1



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