[PATCH v12 0/2] phy: rockchip: naneng-combphy: add SGMII MAC selection for RK3568

[Coia Prant <coiaprant@gmail.com>]

Changes since v11:

- Revert changes in v10.

Changes since v10:

- Drop the top-level "default: 1" for "rockchip,sgmii-mac-sel".
  dtschema injects top-level defaults into every matching node, and the
  injected value conflicts with the "else" branch that forbids the
  property on non-RK3568 variants, breaking dtbs_check on those
  platforms. The driver already treats an absent property as 1 (GMAC1),
  so behavior is unchanged.

===

This is the PHY part split out from the v10 RK3568 SGMII series, sent
separately to linux-phy as suggested by Vinod and Jakub.

On RK3568, the SGMII interface can be routed to either GMAC0 or GMAC1 via
the GRF register pipe_sgmii_mac_sel. Patch 1 documents the
"rockchip,sgmii-mac-sel" DT property, patch 2 adds the driver support.

From the RK3568 TRM (Part1, Page 229), 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 (or omitted), it remains at
GMAC1. This is necessary for boards such as the Ariaboard Photonicat,
which uses the SGMII interface connected to GMAC0.

The DTS changes using this property are sent separately to
Heiko/linux-rockchip, and the net-next parts (XPCS glue, dwmac-rk SGMII
support) are sent separately to net-next. There is no hard build
dependency; the pieces can converge during the merge window.
---
Coia Prant (2):
  dt-bindings: phy: rockchip: naneng-combphy: add rockchip,sgmii-mac-sel
    property
  phy: rockchip: naneng-combphy: add SGMII MAC selection for RK3568

 .../bindings/phy/phy-rockchip-naneng-combphy.yaml   | 13 +++++++++++++
 drivers/phy/rockchip/phy-rockchip-naneng-combphy.c  |  8 ++++++++
 2 files changed, 21 insertions(+)

-- 
2.47.3