Re: [PATCH v13 2/2] phy: rockchip: naneng-combphy: add SGMII MAC selection for RK3568

[Manivannan Sadhasivam <mani@kernel.org>]

On 2026-10-07 00:28 +0800, Coia Prant wrote:
> On RK3568, the SGMII interface can be routed to either GMAC0 or
> GMAC1 via the GRF register pipe_sgmii_mac_sel.
> 
> Add support for this selection by introducing the
> "rockchip,sgmii-mac-sel" DT property.
> 
> From the RK3568 TRM (Part1, Page 229), the PIPE_GRF_XPCS_CON0
> bit 1 (pipe_sgmii_mac_sel) is defined as:
> 
>     0: SGMII routed to GMAC0
>     1: SGMII routed to GMAC1
> 
> The hardware reset value is 1 (GMAC1). If the property is set to 0,
> the driver routes SGMII to GMAC0; if set to 1, it routes to GMAC1.
> If the property is absent, the driver leaves the routing unchanged,
> so the effective value is whatever the bootloader or hardware reset
> left.
> 
> The driver validates the value and rejects anything other than 0 or 1.
> 
> This is necessary for boards such as the Ariaboard Photonicat, which
> uses the SGMII interface connected to GMAC0.
> 
> Link: https://dl.radxa.com/rock3/docs/hw/datasheet/Rockchip%20RK3568%20TRM%20Part1%20V1.1-20210301.pdf (Page 229)
> Signed-off-by: Coia Prant <coiaprant@gmail.com>

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

- Mani