linux-kernel - [PATCH v6 13/17] dt-bindings: iio: adc: adi,ad4695: add SPI offload properties

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Message-Id: <20241211-dlech-mainline-spi-engine-offload-2-v6-13-88ee574d5d03@baylibre.com>
Date: Wed, 11 Dec 2024 14:54:50 -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 v6 13/17] 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.

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

v6 changes:
* Drop $ref to trigger-source.yaml
* Add maxItems to pwms property

v5 changes:
* Added macros for cell values

v4 changes: new patch in v4
---
 Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml | 13 +++++++++++++
 include/dt-bindings/iio/adc/adi,ad4695.h                  |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
index 7d2229dee4441e20a7bafc9165fe309ac2e9eada..cbde7a0505d2b5df22c54ca4556878bf22e9b4b1 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4695.yaml
@@ -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
 
diff --git a/include/dt-bindings/iio/adc/adi,ad4695.h b/include/dt-bindings/iio/adc/adi,ad4695.h
index 9fbef542bf670015c5b34bfbe1336e7e295bf8ab..fea4525d2710cbf58cd4236d3276bad4cb318df9 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