linux-kernel - [PATCH RFC v3 8/9] dt-bindings: iio: adc: adi,ad7944: add SPI offload properties

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Message-ID: <20240722-dlech-mainline-spi-engine-offload-2-v3-8-7420e45df69b@baylibre.com>
Date: Mon, 22 Jul 2024 16:57:15 -0500
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nuno Sá <nuno.sa@...log.com>
Cc: David Lechner <dlechner@...libre.com>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	David Jander <david@...tonic.nl>,
	Martin Sperl <kernel@...tin.sperl.org>,
	linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: [PATCH RFC v3 8/9] dt-bindings: iio: adc: adi,ad7944: add SPI offload properties

To enable capturing data at high rates, the AD7944 is frequently used
with the AXI SPI Engine IP core. This patch adds the properties needed
to describe the SPI offload configuration in the device tree.

Signed-off-by: David Lechner <dlechner@...libre.com>
---

v3 changes:
* Dropped properties that should be SPI controller properties.

v2 changes:

This is a new patch that partially replaces "dt-bindings: iio: offload:
add binding for PWM/DMA triggered buffer".

In the previous review, it was suggested that having a separate binding
and object node for the offload was overcomplicated. So instead this
opts to use the proposed standard spi-offloads property as a flag to
allow the SPI periperhal node require additional properties that are
resources that are physically connected to the SPI offload.
---
 Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml
index d17d184842d3..6533459add87 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml
@@ -129,6 +129,9 @@ properties:
       line goes high while the SDI and CNV lines are high (chain mode),
     maxItems: 1
 
+  spi-offloads:
+    maxItems: 1
+
 required:
   - compatible
   - reg

-- 
2.43.0