netdev - [PATCH v2 1/4 net-next] dt-bindings: net: mdio: add reset-post-delay-us property

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Date:   Thu, 30 Jul 2020 21:57:46 +0200
From:   Bruno Thomsen <bruno.thomsen@...il.com>
To:     netdev <netdev@...r.kernel.org>
Cc:     Bruno Thomsen <bruno.thomsen@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Fabio Estevam <festevam@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Lars Alex Pedersen <laa@...strup.com>,
        Bruno Thomsen <bth@...strup.com>
Subject: [PATCH v2 1/4 net-next] dt-bindings: net: mdio: add reset-post-delay-us property

Add "reset-post-delay-us" parameter to MDIO bus properties,
so it's possible to add a delay after reset deassert.
This is optional in case external hardware slows down
release of the reset signal.

Signed-off-by: Bruno Thomsen <bruno.thomsen@...il.com>
---
 Documentation/devicetree/bindings/net/mdio.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/mdio.yaml b/Documentation/devicetree/bindings/net/mdio.yaml
index d6a3bf8550eb..26afb556dfae 100644
--- a/Documentation/devicetree/bindings/net/mdio.yaml
+++ b/Documentation/devicetree/bindings/net/mdio.yaml
@@ -39,6 +39,13 @@ properties:
       and must therefore be appropriately determined based on all devices
       requirements (maximum value of all per-device RESET pulse widths).
 
+  reset-post-delay-us:
+    description:
+      Delay after reset deassert in microseconds. It applies to all MDIO
+      devices and it's determined by how fast all devices are ready for
+      communication. This delay happens just before e.g. Ethernet PHY
+      type ID auto detection.
+
   clock-frequency:
     description:
       Desired MDIO bus clock frequency in Hz. Values greater than IEEE 802.3
-- 
2.26.2