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SubjectRe: [PATCH v3 2/3] dt-bindings: dma: ti-edma: Document dma-channel-mask for EDMA
On Thu, Sep 26, 2019 at 02:19:53PM +0300, Peter Ujfalusi wrote:
> Similarly to paRAM slots, channels can be used by other cores.
>
> The common dma-channel-mask property can be used for specifying the
> available channels.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
> Documentation/devicetree/bindings/dma/ti-edma.txt | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
> index 4bbc94d829c8..014187088020 100644
> --- a/Documentation/devicetree/bindings/dma/ti-edma.txt
> +++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
> @@ -42,6 +42,11 @@ Optional properties:
> - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
> the driver, they are allocated to be used by for example the
> DSP. See example.
> +- dma-channel-mask: Mask of usable channels.
> + Single uint32 for EDMA with 32 channels, array of two uint32 for
> + EDMA with 64 channels. See example and
> + Documentation/devicetree/bindings/dma/dma-common.yaml
> +
>
> ------------------------------------------------------------------------------
> eDMA3 Transfer Controller
> @@ -91,6 +96,9 @@ edma: edma@49000000 {
> ti,edma-memcpy-channels = <20 21>;
> /* The following PaRAM slots are reserved: 35-44 and 100-109 */
> ti,edma-reserved-slot-ranges = <35 10>, <100 10>;
> + /* The following channels are reserved: 35-44 */
> + dma-channel-mask = <0xffffffff>, /* Channel 0-31 */
> + <0xffffe007>; /* Channel 32-63 */

Doesn't matter yet, but you have a mismatch here with the schema. While
the <> around each int or not doesn't matter for the dtb, it does for
the schema.

dma-channel-mask = <0xffffffff>, <0xffffe007>;
minItems: 1
maxItems: 255

dma-channel-mask = <0xffffffff 0xffffe007>;
items:
minItems: 1
maxItems: 255

I think the latter case is slightly more logical here as you have 1
thing (a mask). If had N of something (like interrupts), then the former
makes sense.

Rob

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