[PATCH net-next v3 3/3] net: stmmac: dwmac-renesas-gbeth: Add support for RZ/T2H SoC

[Anders Roxell]

On 2025-09-08 11:59, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj at 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 at 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 <lkft at linaro.org>

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


By reverting this patch the warning disapears.


## Source
* Kernel version: 6.17.0-rc6
* Git tree:
* https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: next-20250915
* Git commit: c3067c2c38316c3ef013636c93daa285ee6aaa2e
* Architectures: arm64
* Toolchains: gcc and clang
* Kconfigs: lkftconfigs

## Build
* Build log: https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UF8KltAzu6kUpW3hXaYRWjZ/build.log
* Test details: https://regressions.linaro.org/lkft/linux-next-master/next-20250915/log-parser-build-clang/general-unmet-dependencies-warning-unmet-direct-dependencies-detected-for-pcs_rzn_miic/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UF8KltAzu6kUpW3hXaYRWjZ/
* Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UF8KltAzu6kUpW3hXaYRWjZ/config


--
Linaro LKFT