linux-kernel - [PATCH v2 1/3] dt-bindings: spi: renesas,rzv2h-rspi: allow multiple DMAs

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Message-ID: <20260127201706.616374-2-cosmin-gabriel.tanislav.xa@renesas.com>
Date: Tue, 27 Jan 2026 22:17:04 +0200
From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
To: Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-spi@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
Subject: [PATCH v2 1/3] dt-bindings: spi: renesas,rzv2h-rspi: allow multiple DMAs

The Renesas RZ/T2H and RZ/N2H SoCs have multiple DMA controllers that
can be used with the RSPI peripheral. The current bindings only allow a
single pair of RX and TX DMAs.

Allow multiple DMAs by only restricting the possible names of the DMA
channels.

All '.*-names$' properties must conform to the string-array.yaml
meta-schema, which requires both minItems and maxItems properties to be
present before the items can be a schema. Otherwise, the items need to
be an array.

Declare a generous maxItems of 32, which should be enough for 16 DMA
controllers, so that we don't have to update this value ever again, even
if currently the maximum number of DMA controllers on a Renesas SoC is
5.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
---

V2:
 * new patch

 .../devicetree/bindings/spi/renesas,rzv2h-rspi.yaml    | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/renesas,rzv2h-rspi.yaml b/Documentation/devicetree/bindings/spi/renesas,rzv2h-rspi.yaml
index a588b112e11e..383e97f0dabd 100644
--- a/Documentation/devicetree/bindings/spi/renesas,rzv2h-rspi.yaml
+++ b/Documentation/devicetree/bindings/spi/renesas,rzv2h-rspi.yaml
@@ -57,13 +57,15 @@ properties:
       - const: presetn
       - const: tresetn

-  dmas:
-    maxItems: 2
+  dmas: true

   dma-names:
+    minItems: 2
+    maxItems: 32
     items:
-      - const: rx
-      - const: tx
+      enum:
+        - rx
+        - tx

   power-domains:
     maxItems: 1
-- 
2.52.0