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Message-ID: <20231016070318.28355-1-andre.werner@systec-electronic.com>
Date: Mon, 16 Oct 2023 09:02:04 +0200
From: werneazc@...il.com
To: jic23@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
lars@...afoo.de
Cc: devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
Andre Werner <andre.werner@...tec-electronic.com>
Subject: [PATCH v3 1/2] dt-bindings: iio: adc: ti,ads7038: Add description for ADS7038
From: Andre Werner <andre.werner@...tec-electronic.com>
Add basic description for ADS7038 ADC devices.
The devicetree adds the following device specific options:
- average-samples: Program device's programmable average filter.
- crc-enabled: Enable the CRC check for SPI transfers. Sadly, this
option has currently no effect in the driver.
- status-enabled: Enable the appending of the device's status on the
measure value transmission.
- gpio-controller: Sadly function not implemented yet in the driver.
Signed-off-by: Andre Werner <andre.werner@...tec-electronic.com>
---
v3
- Delete ADS7138 compatible and comments.
- Add options for CRC, status and average samples as well as
gpio-controller.
- Update example.
- add regulator for digital IO voltage.
---
.../bindings/iio/adc/ti,ads7038.yaml | 83 +++++++++++++++++++
1 file changed, 83 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
new file mode 100644
index 000000000000..fc1054ca93f7
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7038.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads7038.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADS7038 and similar ADCs
+
+maintainers:
+ - Andre Werner <andre.werner@...tec-electronic.com>
+
+description: |
+ Family of 7 channel, 12 bit ADCs with SPI interface.
+
+ Datasheet: https://www.ti.com/lit/gpn/ads7038
+
+properties:
+ compatible:
+ enum:
+ - ti,ads7038
+
+ reg:
+ maxItems: 1
+
+ spi-max-frequency:
+ maximum: 60000000
+
+ avdd-supply:
+ description: Analog supply voltage, also used as the reference voltage to the ADC.
+
+ dvdd-supply:
+ description: Digital I/O supply voltage.
+
+ average-samples:
+ description: |
+ If specified ADC is configured for avaraging measurements (OSR_CFG Register).
+ This effects output format for measurement and sampling time.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
+ status-enabled:
+ description: |
+ If specified ADC transmits chip status (DATA_CFG Register).
+
+ crc-enabled:
+ description: |
+ Checking the integrity of the data bits exchanged over
+ SPI interface (GENERAL_CFG Register).
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 2
+ description: |
+ Should be 2. See gpio.txt in this directory for a
+ description of the cells format.
+
+required:
+ - compatible
+ - reg
+ - avdd-supply
+ - dvdd-supply
+ - gpio-controller
+ - "#gpio-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "ti,ads7038";
+ reg = <0>;
+ avdd-supply = <&refin_avdd_supply>;
+ dvdd-supply = <&refin_dvdd_supply>;
+ spi-max-frequency = <10000000>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
--
2.42.0
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