linux-kernel - [PATCH 1/2] dt-bindings: net: dsa: marvell: Add single-chip-address property

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Message-Id: <20220423131427.237160-1-nathan@nathanrossi.com>
Date:   Sat, 23 Apr 2022 13:14:27 +0000
From:   Nathan Rossi <nathan@...hanrossi.com>
To:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nathan Rossi <nathan@...hanrossi.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: [PATCH 1/2] dt-bindings: net: dsa: marvell: Add single-chip-address property

Some Marvell DSA devices can be accessed in a single chip addressing
mode. This is currently configured by setting the address of the switch
to 0. However switches in this configuration do not respond to address
0, only responding to higher addresses (fixed addressed based on the
switch model) for the individual ports/etc. This is a feature to allow
for other phys to exist on the same mdio bus.

This change defines a 'single-chip-address' property in order to
explicitly define that the chip is accessed in this mode. This allows
for a switch to have an address defined other than 0, so that address
0 can be used for another mdio device.

Signed-off-by: Nathan Rossi <nathan@...hanrossi.com>
---
 Documentation/devicetree/bindings/net/dsa/marvell.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/marvell.txt b/Documentation/devicetree/bindings/net/dsa/marvell.txt
index 2363b41241..5c7304274c 100644
--- a/Documentation/devicetree/bindings/net/dsa/marvell.txt
+++ b/Documentation/devicetree/bindings/net/dsa/marvell.txt
@@ -46,6 +46,8 @@ Optional properties:
 - mdio?		: Container of PHYs and devices on the external MDIO
 			  bus. The node must contains a compatible string of
 			  "marvell,mv88e6xxx-mdio-external"
+- single-chip-address	: Device is configured to use single chip addressing
+			  mode.
 
 Example:
 
---
2.35.2