linux-kernel - Re: [PATCH 2/4] spi: sun6i: Support A523's SPI controllers

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Message-ID: <2391651.ElGaqSPkdT@jernej-laptop>
Date: Sun, 21 Dec 2025 16:50:54 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
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>, Chen-Yu Tsai <wens@...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 2/4] spi: sun6i: Support A523's SPI controllers

Dne nedelja, 21. december 2025 ob 12:05:09 Srednjeevropski standardni čas je Chen-Yu Tsai napisal(a):
> The A523 has four SPI controllers. One of them supports MIPI DBI mode
> in addition to standard SPI.
> 
> Compared to older generations, this newer controller now has a combined
> counter for the RX FIFO ad buffer levels. In older generations, the
> RX buffer level was a separate bitfield in the FIFO status register.
> 
> In practice this difference is negligible. The buffer is mostly
> invisible to the implementation. If programmed I/O transfers are limited
> to the FIFO size, then the contents of the buffer seem to always be
> flushed over to the FIFO. For DMA, the DRQ trigger levels are only tied
> to the FIFO levels. In all other aspects, the controller is the same as
> the one in the R329.
> 
> Support the standard SPI mode controllers using the settings for R329.
> DBI is left out as there currently is no infrastructure for enabling a
> DBI host controller, as was the case for the R329.
> 
> Also fold the entry for the R329 to make the style consistent.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...nel.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej