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From:   Oleksij Rempel <o.rempel@pengutronix.de>
To:     "David S. Miller" <davem@davemloft.net>,
        Andrew Lunn <andrew@lunn.ch>,
        Eric Dumazet <edumazet@google.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        Woojung Huh <woojung.huh@microchip.com>,
        Arun Ramadoss <arun.ramadoss@microchip.com>,
        Conor Dooley <conor+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Oleksij Rempel <o.rempel@pengutronix.de>, kernel@pengutronix.de,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        UNGLinuxDriver@microchip.com,
        "Russell King (Oracle)" <linux@armlinux.org.uk>,
        devicetree@vger.kernel.org
Subject: [RFC net-next v3 1/2] dt-bindings: net: dsa: microchip: Update ksz device tree bindings for drive strength
Date:   Thu,  7 Sep 2023 11:09:42 +0200
Message-Id: <20230907090943.2385053-2-o.rempel@pengutronix.de>
In-Reply-To: <20230907090943.2385053-1-o.rempel@pengutronix.de>
References: <20230907090943.2385053-1-o.rempel@pengutronix.de>
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Extend device tree bindings to support drive strength configuration for the
ksz* switches. Introduced properties:
- microchip,hi-drive-strength-microamp: Controls the drive strength for
  high-speed interfaces like GMII/RGMII and more.
- microchip,lo-drive-strength-microamp: Governs the drive strength for
  low-speed interfaces such as LEDs, PME_N, and others.
- microchip,io-drive-strength-microamp: Controls the drive strength for
  for undocumented Pads on KSZ88xx variants.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 .../bindings/net/dsa/microchip,ksz.yaml       | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
index e51be1ac03623..f2b6a66a9d22d 100644
--- a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
@@ -49,6 +49,26 @@ properties:
       Set if the output SYNCLKO clock should be disabled. Do not mix with
       microchip,synclko-125.
 
+  microchip,io-drive-strength-microamp:
+    description:
+      IO Pad Drive Strength
+    enum: [8000, 16000]
+    default: 16000
+
+  microchip,hi-drive-strength-microamp:
+    description:
+      High Speed Drive Strength. Controls drive strength of GMII / RGMII /
+      MII / RMII (except TX_CLK/REFCLKI, COL and CRS) and CLKO_25_125 lines.
+    enum: [2000, 4000, 8000, 12000, 16000, 20000, 24000, 28000]
+    default: 24000
+
+  microchip,lo-drive-strength-microamp:
+    description:
+      Low Speed Drive Strength. Controls drive strength of TX_CLK / REFCLKI,
+      COL, CRS, LEDs, PME_N, NTRP_N, SDO and SDI/SDA/MDIO lines.
+    enum: [2000, 4000, 8000, 12000, 16000, 20000, 24000, 28000]
+    default: 8000
+
 required:
   - compatible
   - reg
-- 
2.39.2