linux-kernel - [PATCH net-next 0/4] Add GMAC support for Renesas RZ/{T2H, N2H} SoCs

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Message-ID: <20250902001302.3823418-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Tue,  2 Sep 2025 01:12:58 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Russell King <linux@...linux.org.uk>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH net-next 0/4] Add GMAC support for Renesas RZ/{T2H, N2H} SoCs

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

Hi All,

This series adds support for the Ethernet MAC (GMAC) IP present on
the Renesas RZ/T2H and RZ/N2H SoCs.

While these SoCs use the same Synopsys DesignWare MAC IP (version 5.20) as
the existing RZ/V2H(P), the hardware is synthesized with different options
that require driver and binding updates:
- 8 RX/TX queue pairs instead of 4 (requiring 19 interrupts vs 11)
- Different clock requirements (3 clocks vs 7)
- Different reset handling (2 named resets vs 1 unnamed)
- Split header feature enabled
- GMAC connected through a MIIC PCS on RZ/T2H

The series first updates the generic dwmac binding to accommodate the higher
interrupt count, then extends the Renesas-specific binding with a new generic
compatible string "renesas,rzt2h-gbeth" for both SoCs since they share
identical GMAC IP.

The driver changes prepare for multi-SoC support by introducing OF match data
for per-SoC configuration, then add RZ/T2H support including PCS integration
through the existing RZN1 MIIC driver.

Note this patch series is dependent on the PCS driver [0].
[0] https://lore.kernel.org/all/20250901224327.3429099-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar

Lad Prabhakar (4):
  dt-bindings: net: dwmac: Increase 'maxItems' for 'interrupts' and
    'interrupt-names'
  dt-bindings: net: renesas,rzv2h-gbeth: Document Renesas RZ/T2H and
    RZ/N2H SoCs
  net: stmmac: dwmac-renesas-gbeth: Use OF data for configuration
  net: stmmac: dwmac-renesas-gbeth: Add support for RZ/T2H SoC

 .../bindings/net/renesas,rzv2h-gbeth.yaml     | 177 ++++++++++++++----
 .../devicetree/bindings/net/snps,dwmac.yaml   |   9 +-
 drivers/net/ethernet/stmicro/stmmac/Kconfig   |   1 +
 .../stmicro/stmmac/dwmac-renesas-gbeth.c      | 109 ++++++++++-
 4 files changed, 242 insertions(+), 54 deletions(-)

-- 
2.51.0