linux-kernel - Re: [PATCH v4 1/9] spi: dt-bindings: change spi-{rx,tx}-bus-width to arrays

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Message-ID: <20260111115219.296e8205@jic23-huawei>
Date: Sun, 11 Jan 2026 11:52:19 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Marcelo Schmitt <marcelo.schmitt@...log.com>,
 Michael Hennerich <michael.hennerich@...log.com>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, Sean Anderson
 <sean.anderson@...ux.dev>, linux-spi@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org
Subject: Re: [PATCH v4 1/9] spi: dt-bindings: change spi-{rx,tx}-bus-width
 to arrays

On Fri, 19 Dec 2025 15:32:09 -0600
David Lechner <dlechner@...libre.com> wrote:

> Change spi-rx-bus-width and spi-tx-bus-width properties from single
> uint32 values to arrays of uint32 values. This allows describing SPI
> peripherals connected to controllers that have multiple data lanes for
> receiving or transmitting two or more words in parallel.
> 
> Each index in the array corresponds to a physical data lane (one or more
> wires depending on the bus width). Additional mapping properties will be
> needed in cases where a lane on the controller or peripheral is skipped.
> 
> Bindings that make use of this property are updated in the same commit
> to avoid validation errors.
> 
> The adi,ad4030 binding can now better describe the chips multi-lane
> capabilities, so that binding is refined and gets a new example.
> 
> Converting from single uint32 to array of uint32 does not break .dts/
> .dtb files since there is no difference between specifying a single
> uint32 value and an array with a single uint32 value in devicetree.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>