linux-kernel - [PATCH v5 14/16] dt-bindings: iio: adc: adi,ad4695: add SPI offload properties

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Message-Id: <20241115-dlech-mainline-spi-engine-offload-2-v5-14-bea815bd5ea5@baylibre.com>
Date: Fri, 15 Nov 2024 14:18:53 -0600
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>, Jonathan Cameron <jic23@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>
Cc: Uwe Kleine-König <ukleinek@...nel.org>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, David Jander <david@...tonic.nl>, 
 Martin Sperl <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-iio@...r.kernel.org, linux-pwm@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH v5 14/16] dt-bindings: iio: adc: adi,ad4695: add SPI
 offload properties

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.

The $ref for spi-peripheral-props.yaml is moved to keep similar $refs
grouped together.

Signed-off-by: David Lechner <dlechner@...libre.com>
---

v5 changes:
* Added macros for cell values

v4 changes: new patch in v4
---
 .../devicetree/bindings/iio/adc/adi,ad4695.yaml          | 16 ++++++++++++++--
 include/dt-bindings/iio/adc/adi,ad4695.h                 |  7 +++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
index 7d2229dee444..c0d4e4ff62a4 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
@@ -18,8 +18,6 @@ description: |
   * https://www.analog.com/en/products/ad4697.html
   * https://www.analog.com/en/products/ad4698.html
 
-$ref: /schemas/spi/spi-peripheral-props.yaml#
-
 properties:
   compatible:
     enum:
@@ -84,6 +82,9 @@ properties:
     description: The Reset Input (RESET). Should be configured GPIO_ACTIVE_LOW.
     maxItems: 1
 
+  pwms:
+    description: PWM signal connected to the CNV pin.
+
   interrupts:
     minItems: 1
     items:
@@ -106,6 +107,15 @@ 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
 
@@ -166,6 +176,8 @@ required:
   - vio-supply
 
 allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - $ref: /schemas/spi/trigger-source.yaml#
   - oneOf:
       - required:
           - ldo-in-supply
diff --git a/include/dt-bindings/iio/adc/adi,ad4695.h b/include/dt-bindings/iio/adc/adi,ad4695.h
index 9fbef542bf67..fea4525d2710 100644
--- a/include/dt-bindings/iio/adc/adi,ad4695.h
+++ b/include/dt-bindings/iio/adc/adi,ad4695.h
@@ -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 */

-- 
2.43.0