[PATCH 2/2] phy: amlogic: meson-g12a-usb2: add S4 support

[Manivannan Sadhasivam]

On 2026-10-25 20:22 +0100, christian.koever-draxl at student.uibk.ac.at wrote:
> From: Christian Stefan Kövér-Draxl <ckoever at outlook.de>
> 
> The S4 USB2 PHY follows the A1 programming (MPLL DCO clock select, R21
> calibration, R13 analog settings) with a few differences taken from the
> vendor driver:
> 
>  - edge drive trim 2 instead of 3,
>  - HS disconnect reference 3 instead of 1,
>  - a disconnect threshold in R14, and the R13 PMA signal update bit
>    set to latch the analog settings.
> 
> Without the PMA update the host controller sees no root ports and
> nothing enumerates.
> 
> Tested on an S905W2 board: devices enumerate and work behind a hub on
> the host ports.
> 
> Signed-off-by: Christian Stefan Kövér-Draxl <ckoever at outlook.de>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam at oss.qualcomm.com>

- Mani