linux-kernel - [PATCH net-next 1/2] dt-bindings: net: tja11xx: add nxp,refclk

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Message-Id: <20220819074729.1496088-2-wei.fang@nxp.com>
Date:   Fri, 19 Aug 2022 15:47:27 +0800
From:   wei.fang@....com
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/2] dt-bindings: net: tja11xx: add nxp,refclk_in property

From: Wei Fang <wei.fang@....com>

TJA110x REF_CLK can be configured as interface reference clock
intput or output when the RMII mode enabled. This patch add the
property to make the REF_CLK can be configurable.

Signed-off-by: Wei Fang <wei.fang@....com>
---
 .../devicetree/bindings/net/nxp,tja11xx.yaml    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
index d51da24f3505..c51ee52033e8 100644
--- a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
+++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
@@ -31,6 +31,22 @@ patternProperties:
         description:
           The ID number for the child PHY. Should be +1 of parent PHY.
 
+      nxp,rmii_refclk_in:
+        type: boolean
+        description: |
+          The REF_CLK is provided for both transmitted and receivced data
+          in RMII mode. This clock signal is provided by the PHY and is
+          typically derived from an external 25MHz crystal. Alternatively,
+          a 50MHz clock signal generated by an external oscillator can be
+          connected to pin REF_CLK. A third option is to connect a 25MHz
+          clock to pin CLK_IN_OUT. So, the REF_CLK should be configured
+          as input or output according to the actual circuit connection.
+          If present, indicates that the REF_CLK will be configured as
+          interface reference clock input when RMII mode enabled.
+          If not present, the REF_CLK will be configured as interface
+          reference clock output when RMII mode enabled.
+          Only supported on TJA1100 and TJA1101.
+
     required:
       - reg
 
@@ -44,6 +60,7 @@ examples:
 
         tja1101_phy0: ethernet-phy@4 {
             reg = <0x4>;
+            nxp,rmii_refclk_in;
         };
     };
   - |
-- 
2.25.1