linux-kernel - [PATCH RFC v2 0/4] Support multi-channel IRQs in stmmac platform drivers

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Message-Id: <20260121-dwmac_multi_irq-v2-0-3b829230d071@oss.nxp.com>
Date: Wed, 21 Jan 2026 15:23:34 +0100
From: Jan Petrous via B4 Relay <devnull+jan.petrous.oss.nxp.com@...nel.org>
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>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Chester Lin <chester62515@...il.com>, Matthias Brugger <mbrugger@...e.com>, 
 Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>, 
 NXP S32 Linux Team <s32@....com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, devicetree@...r.kernel.org, 
 "Jan Petrous (OSS)" <jan.petrous@....nxp.com>
Subject: [PATCH RFC v2 0/4] Support multi-channel IRQs in stmmac platform
 drivers

The stmmac core supports two interrupt modes, controlled by the
flag STMMAC_FLAG_MULTI_MSI_EN:

- When the flag is set, the driver uses multi-channel IRQ mode (Multi-IRQ).
- Otherwise, a single IRQ line is requested (aka MAC-IRQ):

static int stmmac_request_irq(struct net_device *dev)
{
        /* Request the IRQ lines */
        if (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN)
                ret = stmmac_request_irq_multi_msi(dev);
        else
                ret = stmmac_request_irq_single(dev);
}

At present, only PCI drivers (Intel and Loongson) make use of the Multi-IRQ
mode. This concept can be extended to DT-based embedded glue drivers
(dwmac-xxx.c).

This series adds support for reading per-channel IRQs from the DT node and
reuses the existing STMMAC_FLAG_MULTI_MSI_EN flag to enable multi-IRQ
operation in platform drivers.

The final decision if Multi-IRQ gets enabled remains on glue driver
to allow implementing any reguirements/limitions the focused platform
needs.

NXP S32G2/S32G3/S32R SoCs integrate the DWMAC IP with multi-channel
interrupt support. The dwmac-s32.c driver change is provided as an example of
enabling multi-IRQ mode for non-PCI drivers.

Signed-off-by: Jan Petrous (OSS) <jan.petrous@....nxp.com>
---
Changes in v2:
- Fixed incorrect buffer len for 'rx-queue-%d' property check
- Added backward compatibility to not break old settings
- Fixed DT example in yaml
- Link to v1: https://lore.kernel.org/r/20251214-dwmac_multi_irq-v1-0-36562ab0e9f7@oss.nxp.com

---
Jan Petrous (OSS) (4):
      net: stmmac: platform: read channels irq
      dt-bindings: net: nxp,s32-dwmac: Declare per-queue interrupts
      arm64: dts: s32: set Ethernet channel irqs
      stmmac: s32: enable support for Multi-IRQ mode

 .../devicetree/bindings/net/nxp,s32-dwmac.yaml     | 42 +++++++++++++++++++---
 arch/arm64/boot/dts/freescale/s32g2.dtsi           | 26 ++++++++++++--
 arch/arm64/boot/dts/freescale/s32g3.dtsi           | 26 ++++++++++++--
 drivers/net/ethernet/stmicro/stmmac/dwmac-s32.c    | 13 ++++++-
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 38 +++++++++++++++++++-
 5 files changed, 132 insertions(+), 13 deletions(-)
---
base-commit: cb015814f8b6eebcbb8e46e111d108892c5e6821
change-id: 20251209-dwmac_multi_irq-9d8f60462cc1

Best regards,
-- 
Jan Petrous (OSS) <jan.petrous@....nxp.com>