linux-kernel - [PATCH RFC v2 5/8] spi: dt-bindings: axi-spi-engine: document spi-offloads

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Message-ID: <20240510-dlech-mainline-spi-engine-offload-2-v2-5-8707a870c435@baylibre.com>
Date: Fri, 10 May 2024 19:44:28 -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 v2 5/8] spi: dt-bindings: axi-spi-engine: document spi-offloads

The AXI SPI Engine has support for hardware offloading capabilities.
There can be up to 32 offload instances per SPI controller, so the
bindings limit the value accordingly.

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

v2 changes:

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

The controller no longer has an offloads object node and the
spi-offloads property is now a standard SPI peripheral property.
---
 .../devicetree/bindings/spi/adi,axi-spi-engine.yaml        | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
index d48faa42d025..c0668aab8b2a 100644
--- a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
+++ b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
@@ -41,6 +41,20 @@ properties:
       - const: s_axi_aclk
       - const: spi_clk
 
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    type: object
+    $ref: spi-peripheral-props.yaml
+    additionalProperties: true
+    properties:
+      spi-offloads:
+        description:
+          An array of 1 or more offload instance numbers assigned to this
+          peripheral.
+        items:
+          minimum: 0
+          maximum: 31
+
 required:
   - compatible
   - reg

-- 
2.43.2