linux-kernel - [PATCH v4 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg

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Message-ID: <20230714101406.17686-2-samin.guo@starfivetech.com>
Date:   Fri, 14 Jul 2023 18:14:05 +0800
From:   Samin Guo <samin.guo@...rfivetech.com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, Peter Geis <pgwipeout@...il.com>,
        Frank <Frank.Sae@...or-comm.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "Russell King" <linux@...linux.org.uk>,
        Samin Guo <samin.guo@...rfivetech.com>,
        "Yanhong Wang" <yanhong.wang@...rfivetech.com>
Subject: [PATCH v4 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg

The motorcomm phy (YT8531) supports the ability to adjust the drive
strength of the rx_clk/rx_data.

The YT8531 RGMII LDO voltage supports 1.8V/3.3V, and the
LDO voltage can be configured with hardware pull-up resistors to match
the SOC voltage (usually 1.8V). The software can read the registers
0xA001 obtain the current LDO voltage value.

When we configure the drive strength, we need to read the current LDO
voltage value to ensure that it is a legal value at that LDO voltage.

Reviewed-by: Hal Feng <hal.feng@...rfivetech.com>
Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
---
 .../bindings/net/motorcomm,yt8xxx.yaml        | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
index 157e3bbcaf6f..097bf143af35 100644
--- a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
+++ b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
@@ -52,6 +52,52 @@ properties:
       for a timer.
     type: boolean
 
+  motorcomm,rx-clk-driver-strength:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      drive strength of rx_clk rgmii pad.
+      |----------------------------------|
+      |        rx_clk ds map table       |
+      |----------------------------------|
+      | DS(3b) |  wol@...v  |  wol@...v  |
+      |________|_________________________|
+      |        | current(uA)| current(uA)|
+      |   000  |     1200   |    3070    |
+      |   001  |     2100   |    4080    |
+      |   010  |     2700   |    4370    |
+      |   011  |     2910   |    4680    |
+      |   100  |     3110   |    5020    |
+      |   101  |     3600   |    5450    |
+      |   110  |     3970   |    5740    |
+      |   111  |     4350   |    6140    |
+      |--------|------------|------------|
+    enum: [ 1200, 2100, 2700, 2910, 3070, 3110, 3600, 3970,
+            4080, 4350, 4370, 4680, 5020, 5450, 5740, 6140 ]
+    default: 2910
+
+  motorcomm,rx-data-driver-strength:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      drive strength of rx_data/rx_ctl rgmii pad.
+      |----------------------------------|
+      |        rx_data ds map table      |
+      |----------------------------------|
+      | DS(3b) |  wol@...v  |  wol@...v  |
+      |________|_________________________|
+      |        | current(uA)| current(uA)|
+      |   000  |     1200   |    3070    |
+      |   001  |     2100   |    4080    |
+      |   010  |     2700   |    4370    |
+      |   011  |     2910   |    4680    |
+      |   100  |     3110   |    5020    |
+      |   101  |     3600   |    5450    |
+      |   110  |     3970   |    5740    |
+      |   111  |     4350   |    6140    |
+      |--------|------------|------------|
+    enum: [ 1200, 2100, 2700, 2910, 3070, 3110, 3600, 3970,
+            4080, 4350, 4370, 4680, 5020, 5450, 5740, 6140 ]
+    default: 2910
+
   motorcomm,tx-clk-adj-enabled:
     description: |
       This configuration is mainly to adapt to VF2 with JH7110 SoC.
-- 
2.17.1