From: Joy Zou Date: Wed, 11 Feb 2026 09:28:24 +0000 (+0800) Subject: dt-bindings: dma: fsl-edma: add dma-channel-mask property description X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75b28d74f90c79e788e0e86caf0173fc0b2e92aa;p=thirdparty%2Flinux.git dt-bindings: dma: fsl-edma: add dma-channel-mask property description Add documentation for the dma-channel-mask property in the fsl-edma binding. This property uses an inverted bit definition: bit value 0 indicates the channel is available, while bit value 1 indicates unavailable. That was already used widely for i.MX8, i.MX9. Correcting the definition will break backward compatibility. This reversal only impacts the eDMA dts node and driver, and doesn't impact DMA consumer. Therefore, keep the inverted definition. Also add a note at the top of the binding to highlight this inverted definition to prevent confusion. Signed-off-by: Joy Zou Reviewed-by: Frank Li Acked-by: Rob Herring (Arm) Link: https://patch.msgid.link/20260211-b4-imx95-v2x-v4-1-10852754b267@nxp.com Signed-off-by: Vinod Koul --- diff --git a/Documentation/devicetree/bindings/dma/fsl,edma.yaml b/Documentation/devicetree/bindings/dma/fsl,edma.yaml index fa4248e2f1b9c..f609038e35ae1 100644 --- a/Documentation/devicetree/bindings/dma/fsl,edma.yaml +++ b/Documentation/devicetree/bindings/dma/fsl,edma.yaml @@ -12,6 +12,9 @@ description: | DMAMUX0 and DMAMUX1, specific DMA request source can only be multiplexed by any channel of certain group, DMAMUX0 or DMAMUX1, but not both. + This binding has an inverted dma-channel-mask definition compared to + the common DMA binding for historical reasons. + maintainers: - Peng Fan @@ -95,6 +98,12 @@ properties: eDMA are implemented in big endian mode, otherwise in little mode. type: boolean + dma-channel-mask: + description: | + Bitmask of available DMA channels (inverted definition). + Bit semantics: 0 means channel available, 1 means channel unavailable + default: 0 + required: - "#dma-cells" - compatible