linux-kernel - [PATCH 00/13] Add DMA support for RZ/T2H RSPI

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Message-ID: <20251201134229.600817-1-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Mon,  1 Dec 2025 15:42:16 +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>,
	Philipp Zabel <p.zabel@...gutronix.de>
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 00/13] 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/20251201124911.572395-1-cosmin-gabriel.tanislav.xa@renesas.com/

Cosmin Tanislav (13):
  spi: rzv2h-rspi: fix rzv2h_rspi_transfer_one() indentation
  spi: rzv2h-rspi: remove call to spi_finalize_current_transfer()
  spi: rzv2h-rspi: do not set SPI_TRANS_FAIL_IO
  spi: rzv2h-rspi: use device-managed APIs
  spi: rzv2h-rspi: store RX interrupt in state
  spi: rzv2h-rspi: set MUST_RX/MUST_TX
  spi: rzv2h-rspi: set TX FIFO threshold to 0
  spi: rzv2h-rspi: enable TX buffer empty interrupt
  spi: rzv2h-rspi: split out PIO transfer
  dt-bindings: spi: renesas,rzv2h-rspi: document optional support for
    DMA
  spi: rzv2h-rspi: add support for DMA mode
  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      |   8 +
 arch/arm64/boot/dts/renesas/r9a09g077.dtsi    |   8 +
 arch/arm64/boot/dts/renesas/r9a09g087.dtsi    |   8 +
 drivers/spi/spi-rzv2h-rspi.c                  | 281 ++++++++++++++----
 4 files changed, 242 insertions(+), 63 deletions(-)

-- 
2.52.0