linux-kernel - [PATCH v2 0/3] Add DMA support for RZ/T2H RSPI

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Message-ID: <20260127201706.616374-1-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Tue, 27 Jan 2026 22:17:03 +0200
From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
To: Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-spi@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
Subject: [PATCH v2 0/3] Add DMA support for RZ/T2H RSPI

The DMA controller can be used to transfer data to and from the SPI
controller without involving the CPU for each word of a SPI transfer.

Add support for DMA mode, and do some other cleanups while touching the
same code.

The dts changes in this series depend on the DMA series [1].

[1]: https://lore.kernel.org/lkml/20260105114445.878262-1-cosmin-gabriel.tanislav.xa@renesas.com/#t

V2:
 * drop patches picked up by Mark
 * add new dt-bindings patch to allow multiple DMAs
 * wire up all DMA controllers for every SPI controller

Cosmin Tanislav (3):
  dt-bindings: spi: renesas,rzv2h-rspi: allow multiple DMAs
  arm64: dts: renesas: r9a09g077: wire up DMA support for SPI
  arm64: dts: renesas: r9a09g087: wire up DMA support for SPI

 .../bindings/spi/renesas,rzv2h-rspi.yaml         | 10 ++++++----
 arch/arm64/boot/dts/renesas/r9a09g077.dtsi       | 16 ++++++++++++++++
 arch/arm64/boot/dts/renesas/r9a09g087.dtsi       | 16 ++++++++++++++++
 3 files changed, 38 insertions(+), 4 deletions(-)

-- 
2.52.0