[PATCH 0/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for rk3576 board

[Andrew Lunn]

On Wed, Jan 21, 2026 at 11:15:45AM +0800, Chaoyi Chen wrote:
> From: Chaoyi Chen <chaoyi.chen at rock-chips.com>
> 
> According to the description in the net documentation, PHY modes
> "rgmii", "rgmii-rxid" and "rgmii-txid" modes require the clock signal
> to be delayed on the PCB.
> 
> The Rockchip platform has long used the above mentioned PHY modes and
> private delay prop to describe the internal IO delay settings of the
> chip, which is inconsistent with what is described in the documentation.
> 
> Some background, for RK3576, you can assume that:
> 
>         tx_delay_time(ns) = 0.0579 * delay_line_count + 0.105

Where did this formula come from? Is it in the datasheet.

      Andrew