From: Jakub Kicinski <kuba@kernel.org>
Date: Tue, 17 Mar 2026 03:07:05 +0000 (-0700)
Subject: Merge branch 'support-multi-channel-irqs-in-stmmac-platform-drivers'
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a91b5d44d5c5b4f46a087200c124c9899cc0ec48;p=thirdparty%2Flinux.git

Merge branch 'support-multi-channel-irqs-in-stmmac-platform-drivers'

Jan Petrous says:

====================
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.
====================

Link: https://patch.msgid.link/20260313-dwmac_multi_irq-v12-0-b5c9d0aa13d6@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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a91b5d44d5c5b4f46a087200c124c9899cc0ec48