2023-09-07 21:15:37

by Oleksij Rempel

Subject: [RFC net-next v3 1/2] dt-bindings: net: dsa: microchip: Update ksz device tree bindings for drive strength

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 <[email protected]>
---
.../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

2023-09-11 22:45:47

by Rob Herring (Arm)

Subject: Re: [RFC net-next v3 1/2] dt-bindings: net: dsa: microchip: Update ksz device tree bindings for drive strength

On Thu, 07 Sep 2023 11:09:42 +0200, Oleksij Rempel wrote:
> 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 <[email protected]>
> ---
> .../bindings/net/dsa/microchip,ksz.yaml | 20 +++++++++++++++++++
> 1 file changed, 20 insertions(+)
>

Reviewed-by: Rob Herring <[email protected]>