dt-bindings: sound: sun4i-i2s: Document that the RX channel can be missing

The A83t and compatibles controllers don't have any reception capabilities
on some instances of the controllers, even though it was never documented
as such in the binding before.

Therefore, on those controllers, we don't have the option to set an RX DMA
channel.

This was already done in the DTSI, but the binding itself was never
updated. Let's add a special case in the schemas.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Maxime Ripard 2019-05-24 14:57:59 +02:00 committed by Mark Brown
parent 0a0ca8e94c
commit eb5b12843b
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1 changed files with 42 additions and 10 deletions

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@ -41,19 +41,11 @@ properties:
- const: apb
- const: mod
dmas:
items:
- description: RX DMA Channel
- description: TX DMA Channel
dma-names:
items:
- const: rx
- const: tx
# Even though it only applies to subschemas under the conditionals,
# not listing them here will trigger a warning because of the
# additionalsProperties set to false.
dmas: true
dma-names: true
resets:
maxItems: 1
@ -72,6 +64,46 @@ allOf:
required:
- resets
- if:
properties:
compatible:
contains:
const: allwinner,sun8i-a83t-i2s
then:
properties:
dmas:
minItems: 1
maxItems: 2
items:
- description: RX DMA Channel
- description: TX DMA Channel
description:
Some controllers cannot receive but can only transmit
data. In such a case, the RX DMA channel is to be omitted.
dma-names:
oneOf:
- items:
- const: rx
- const: tx
- const: tx
description:
Some controllers cannot receive but can only transmit
data. In such a case, the RX name is to be omitted.
else:
properties:
dmas:
items:
- description: RX DMA Channel
- description: TX DMA Channel
dma-names:
items:
- const: rx
- const: tx
required:
- "#sound-dai-cells"
- compatible