linux-kernel - Re: [PATCH v4 1/3] dt-bindings: dma: fsl-edma: add dma-channel-mask property description

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Message-ID: <177084759873.3973046.826103980569808616.robh@kernel.org>
Date: Wed, 11 Feb 2026 16:06:39 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Joy Zou <joy.zou@....com>
Cc: Peng Fan <peng.fan@....com>, Ye Li <ye.li@....com>, imx@...ts.linux.dev,
	Shawn Guo <shawnguo@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Frank Li <Frank.Li@....com>, devicetree@...r.kernel.org,
	Fabio Estevam <festevam@...il.com>, linux-kernel@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: dma: fsl-edma: add dma-channel-mask
 property description


On Wed, 11 Feb 2026 17:28:24 +0800, Joy Zou wrote:
> 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 <joy.zou@....com>
> ---
>  Documentation/devicetree/bindings/dma/fsl,edma.yaml | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 

Acked-by: Rob Herring (Arm) <robh@...nel.org>