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dt-bindings: iio: adc: adi,ad4695: add SPI offload properties

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Add a pwms property to the adi,ad4695 binding to specify an optional PWM
output connected to the CNV pin on the ADC.

Also add #trigger-source-cells property to allow the BUSY output to be
used as a SPI offload trigger source to indicate when a sample is ready
to be read.

Macros are added to adi,ad4695.h for the cell values to help with
readability since they are arbitrary values.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250207-dlech-mainline-spi-engine-offload-2-v8-13-e48a489be48c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner 2025-02-07 14:09:10 -06:00 • committed by Jonathan Cameron
parent f06a9c3672
commit b7c1e069f5
2 changed files with 20 additions and 0 deletions
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13
Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
View file

@ -84,6 +84,10 @@ properties:
description: The Reset Input (RESET). Should be configured GPIO_ACTIVE_LOW.
maxItems: 1
pwms:
description: PWM signal connected to the CNV pin.
maxItems: 1
interrupts:
minItems: 1
items:
@ -106,6 +110,15 @@ properties:
The first cell is the GPn number: 0 to 3.
The second cell takes standard GPIO flags.
'#trigger-source-cells':
description: |
First cell indicates the output signal: 0 = BUSY, 1 = ALERT.
Second cell indicates which GPn pin is used: 0, 2 or 3.
For convenience, macros for these values are available in
dt-bindings/iio/adc/adi,ad4695.h.
const: 2
"#address-cells":
const: 1

7
include/dt-bindings/iio/adc/adi,ad4695.h
View file

@ -6,4 +6,11 @@
#define AD4695_COMMON_MODE_REFGND 0xFF
#define AD4695_COMMON_MODE_COM 0xFE
#define AD4695_TRIGGER_EVENT_BUSY 0
#define AD4695_TRIGGER_EVENT_ALERT 1
#define AD4695_TRIGGER_PIN_GP0 0
#define AD4695_TRIGGER_PIN_GP2 2
#define AD4695_TRIGGER_PIN_GP3 3
#endif /* _DT_BINDINGS_ADI_AD4695_H */