[PATCH] arm64: dts: rockchip: use MAC TX delay for ROCK 4D

[Russell King (Oracle)]

On Thu, Jul 24, 2025 at 04:31:25PM +0200, Sebastian Reichel wrote:
> According to the Ethernet controller device tree binding "rgmii-id"
> means, that the PCB does not have extra long lines to add the required
> delays. This is indeed the case for the ROCK 4D.
> 
> The problem is, that the Rockchip MAC Linux driver interprets the
> interface type differently and abuses the information to configure
> RX and TX delays in the MAC using (vendor) properties 'rx_delay' and
> 'tx_delay'.
> 
> When Detlev Casanova upstreamed the ROCK 4D device tree, he used the
> correct description for the board ("rgmii-id"). This results in no delays
> being configured in the MAC. At the same time the PHY will provide
> some delays.

So why can't the MAC be fixed to conform to the requirements that are
well documented for RGMII?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!