linux-kernel - Re: [PATCH 0/4] arm64: allwinner: a523: Support SPI controllers

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Message-ID: <CAGb2v67NbSA8Fq16EL-zY9WKVxnYUosk6z7NrGtAXt6UY8xdMw@mail.gmail.com>
Date: Mon, 22 Dec 2025 16:33:08 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Chen-Yu Tsai <wens@...nel.org>, Jernej Skrabec <jernej@...nel.org>, 
	Samuel Holland <samuel@...lland.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Mark Brown <broonie@...nel.org>
Cc: Andre Przywara <andre.przywara@....com>, linux-spi@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-sunxi@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] arm64: allwinner: a523: Support SPI controllers

On Sun, Dec 21, 2025 at 7:05 PM Chen-Yu Tsai <wens@...nel.org> wrote:
>
> Hi folks,
>
> This series adds support for the SPI controllers found in the Allwinner
> A523 SoC family. The SPI controller is almost the same as the ones in
> previous generations, except that it moved the "RX buffer count"
> register field to a separate register, and that register now reports
> the total count for RX buffer and FIFO.
>
> In practice the driver has never cared about the buffer count, but if
> any implementation were to use it, this counts as a non-backward
> compatible change.
>
> Also, one of the SPI controllers supports DBI mode, acting as a display
> interface. There is no infrastructure for DBI interface controllers in
> the kernel, so only a separate compatible is added for it.
>
> Patch 1 adds compatible strings for the new variants.
>
> Patch 2 adds driver support for the new SPI controller variant.
>
> Patch 3 adds device nodes for the SPI controllers to the dtsi file,
> along with pinmux settings for spi0 on the PC pins, a common usage for
> SPI-NOR flashes to boot from.
>
> Patch 4 enables the SPI-NOR flash found on the Radxa Cubie A5E.

As pointed out to me on IRC, this change targets the Orangepi 4A, not
the Radxa Cubie A5E. The latter has circuits for SPI-NOR, but the whole
block is left unpopulated.

ChenYu

>
> Please take a look and try it out.
>
>
> Thanks
> ChenYu
>
>
> Chen-Yu Tsai (4):
>   spi: dt-bindings: sun6i: Add compatibles for A523's SPI controllers
>   spi: sun6i: Support A523's SPI controllers
>   arm64: dts: allwinner: sun55i: Add SPI controllers
>   arm64: dts: allwinner: t527: orangepi-4a: Enable SPI-NOR flash
>
>  .../bindings/spi/allwinner,sun6i-a31-spi.yaml |  4 +
>  .../arm64/boot/dts/allwinner/sun55i-a523.dtsi | 94 +++++++++++++++++++
>  .../dts/allwinner/sun55i-t527-orangepi-4a.dts | 15 +++
>  drivers/spi/spi-sun6i.c                       | 11 ++-
>  4 files changed, 120 insertions(+), 4 deletions(-)
>
> --
> 2.47.3
>