netdev - [PATCH v5 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg

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Date: Thu, 20 Jul 2023 19:15:08 +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 v5 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.

Reviewed-by: Hal Feng <hal.feng@...rfivetech.com>
Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
---
 .../bindings/net/motorcomm,yt8xxx.yaml        | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
index 157e3bbcaf6f..605be74f8556 100644
--- a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
+++ b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
@@ -52,6 +52,40 @@ properties:
       for a timer.
     type: boolean
 
+  motorcomm,rx-clk-drv-microamp:
+    description: |
+      drive strength of rx_clk rgmii pad.
+      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 to obtain the LDO voltage and configure
+      the legal drive strength(curren).
+      =====================================================
+      | voltage |        curren Available (uA)            |
+      |   1.8v  | 1200 2100 2700 2910 3110 3600 3970 4350 |
+      |   3.3v  | 3070 4080 4370 4680 5020 5450 5740 6140 |
+      =====================================================
+    enum: [ 1200, 2100, 2700, 2910, 3070, 3110, 3600, 3970,
+            4080, 4350, 4370, 4680, 5020, 5450, 5740, 6140 ]
+    default: 2910
+
+  motorcomm,rx-data-drv-microamp:
+    description: |
+      drive strength of rx_data/rx_ctl rgmii pad.
+      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 to obtain the LDO voltage and configure
+      the legal drive strength(curren).
+      =====================================================
+      | voltage |        curren Available (uA)            |
+      |   1.8v  | 1200 2100 2700 2910 3110 3600 3970 4350 |
+      |   3.3v  | 3070 4080 4370 4680 5020 5450 5740 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