From bc4d251ee8442fa23758bf13de0bda603da01e22 Mon Sep 17 00:00:00 2001
From: Mike Looijmans <mike.looijmans@topic.nl>
Date: Fri, 16 Feb 2024 16:30:19 +0100
Subject: [PATCH] dt-bindings: iio: adc: ti-ads1298: Add bindings
Bindings for the TI ADS1298 medical ADC. This device is
typically used for ECG and similar measurements. Supports data
acquisition at configurable scale and sampling frequency.
The device has so many options for connecting stuff, at this
point the bindings aren't nearly complete but partial bindings
are better than no bindings at all.
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240216153020.485201-1-mike.looijmans@topic.nl
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
.../bindings/iio/adc/ti,ads1298.yaml | 80 +++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
new file mode 100644
index 000000000000..bf5a43a81d59
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads1298.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments' ads1298 medical ADC chips
+
+description: |
+ Datasheet at: https://www.ti.com/product/ADS1298
+ Bindings for this chip aren't complete.
+
+maintainers:
+ - Mike Looijmans <mike.looijmans@topic.nl>
+
+properties:
+ compatible:
+ enum:
+ - ti,ads1298
+
+ reg:
+ maxItems: 1
+
+ spi-cpha: true
+
+ reset-gpios:
+ maxItems: 1
+
+ avdd-supply:
+ description:
+ Analog power supply, voltage between AVDD and AVSS. When providing a
+ symmetric +/- 2.5V, the regulator should report 5V.
+
+ vref-supply:
+ description:
+ Optional reference voltage. If omitted, internal reference is used,
+ which is 2.4V when analog supply is below 4.4V, 4V otherwise.
+
+ clocks:
+ description: Optional 2.048 MHz external source clock on CLK pin
+ maxItems: 1
+
+ interrupts:
+ description: Interrupt on DRDY pin, triggers on falling edge
+ maxItems: 1
+
+ label: true
+
+required:
+ - compatible
+ - reg
+ - avdd-supply
+ - interrupts
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@1 {
+ reg = <1>;
+ compatible = "ti,ads1298";
+ label = "ads1298-1-ecg";
+ avdd-supply = <®_iso_5v_a>;
+ clocks = <&clk_ads1298>;
+ interrupt-parent = <&gpio0>;
+ interrupts = <78 IRQ_TYPE_EDGE_FALLING>;
+ spi-max-frequency = <20000000>;
+ spi-cpha;
+ };
+ };
+...