[PATCH v4 3/3] spi: dt-bindings: document zero value for spi-{rx,tx}-bus-width properties

From: Alexandru Ardelean
Date: Thu Dec 03 2020 - 09:01:54 EST


Following a change to the SPI framework, providing a value of zero for
'spi-rx-bus-width' and 'spi-tx-bus-width' is now possible and will
essentially mean that no RX or TX is allowed.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---

Changelog v3 -> v4:
* https://lore.kernel.org/linux-spi/20201127130834.136348-3-alexandru.ardelean@xxxxxxxxxx/
* fix typos

Documentation/devicetree/bindings/spi/spi-controller.yaml | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
index 1b56d5e40f1f..cf663e4a4afe 100644
--- a/Documentation/devicetree/bindings/spi/spi-controller.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml
@@ -125,8 +125,9 @@ patternProperties:
spi-rx-bus-width:
description:
Bus width to the SPI bus used for read transfers.
+ If 0 is provided, then no RX will be possible on this device.
$ref: /schemas/types.yaml#/definitions/uint32
- enum: [1, 2, 4, 8]
+ enum: [0, 1, 2, 4, 8]
default: 1

spi-rx-delay-us:
@@ -136,8 +137,9 @@ patternProperties:
spi-tx-bus-width:
description:
Bus width to the SPI bus used for write transfers.
+ If 0 is provided, then no TX will be possible on this device.
$ref: /schemas/types.yaml#/definitions/uint32
- enum: [1, 2, 4, 8]
+ enum: [0, 1, 2, 4, 8]
default: 1

spi-tx-delay-us:
--
2.17.1