Hi Anders,

On Tue, 16 Sept 2025 at 15:05, Anders Roxell [off-list ref] wrote:

On 2025-09-08 11:59, Prabhakar wrote:

quoted

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Extend the Renesas GBETH stmmac glue driver to support the RZ/T2H SoC,
where the GMAC is connected through a MIIC PCS. Introduce a new
`has_pcs` flag in `struct renesas_gbeth_of_data` to indicate when PCS
handling is required.

When enabled, the driver parses the `pcs-handle` phandle, creates a PCS
instance with `miic_create()`, and wires it into phylink. Proper cleanup
is done with `miic_destroy()`. New init/exit/select hooks are added to
`plat_stmmacenet_data` for PCS integration.

Update Kconfig to select `PCS_RZN1_MIIC` when building the Renesas GBETH
driver so the PCS support is always available.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3:
- Dropped passing STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP flag in stmmac_flags
  as it is always set for all the SoCs.
- Updated Kconfig to include RZ/T2H and RZ/N2H.

v1->v2:
- No changes.

The following warning is seen when doing a defconfig build (make
defconfig) for arm64 on the Linux next-20250915 tag.

First seen on next-20250915
Good: next-20250912
Bad: next-20250915

Regression Analysis:
- New regression? yes
- Reproducibility? yes

Build regression: WARNING: unmet direct dependencies detected for PCS_RZN1_MIIC

Reported-by: Linux Kernel Functional Testing <redacted>

This is the build warning:
WARNING: unmet direct dependencies detected for PCS_RZN1_MIIC
  Depends on [n]: NETDEVICES [=y] && OF [=y] && (ARCH_RZN1 [=n] || COMPILE_TEST [=n])
  Selected by [m]:
  - DWMAC_RENESAS_GBETH [=m] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_STMICRO [=y] && STMMAC_ETH [=m] && STMMAC_PLATFORM [=m] && OF [=y] && (ARCH_RENESAS [=y] || COMPILE_TEST [=n])

WARNING: unmet direct dependencies detected for PCS_RZN1_MIIC
  Depends on [n]: NETDEVICES [=y] && OF [=y] && (ARCH_RZN1 [=n] || COMPILE_TEST [=n])
  Selected by [m]:
  - DWMAC_RENESAS_GBETH [=m] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_STMICRO [=y] && STMMAC_ETH [=m] && STMMAC_PLATFORM [=m] && OF [=y] && (ARCH_RENESAS [=y] || COMPILE_TEST [=n])
I: config: PASS in 0:00:01.592356

Thanks for your report!

    config DWMAC_RENESAS_GBETH
        depends on OF && (ARCH_RENESAS || COMPILE_TEST)
        select PCS_RZN1_MIIC

    config PCS_RZN1_MIIC
        depends on ARCH_RZN1 || ARCH_R9A09G077 || ARCH_R9A09G087 || COMPILE_TEST

"ARCH_RENESAS" is wider than "ARCH_RZN1 || ARCH_R9A09G077 || ARCH_R9A09G087".
I would just change the latter to ARCH_RENESAS.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds