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Subject[PATCH 1/3] dt-bindings: iio: adc: add support for AD5940
Date
Add yaml devicetree description file and a header file for
helping configure positive and negtive input of AD5940.

Signed-off-by: Song Qiang <songqiang1304521@gmail.com>
---
.../bindings/iio/adc/adi,ad5940.yaml | 240 ++++++++++++++++++
include/dt-bindings/iio/adc/adi,ad5940.h | 52 ++++
2 files changed, 292 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
create mode 100644 include/dt-bindings/iio/adc/adi,ad5940.h

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
new file mode 100644
index 000000000000..f7f034fdd8ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad5940.yaml
@@ -0,0 +1,240 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2019 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ad5940.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD5940 Device Tree Bindings
+
+maintainers:
+ - Song Qiang <songqiang1304521@gmail.com>
+
+description: |
+ Analog Devices AD5940 High Precision, Impedance, and Electrochemical Front End.
+ https://www.analog.com/media/en/technical-documentation/data-sheets/AD5940.pdf
+
+properties:
+ compatible:
+ enum:
+ - adi,ad5940
+
+ reg:
+ maxItems: 1
+
+ vref-supply:
+ description:
+ The regulator to be used to supply the reference voltage.
+ maxItems: 1
+
+ adi,interrupt-io:
+ description:
+ Output GPIO index of interrupt controller of AD5940.
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 3, 6, 7]
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - adi,interrupt-io
+
+patternProperties:
+ # 'channel@0-255'
+ "^channel@([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$":
+ type: object
+ description: |
+ Represents the external channels which are connected to the ADC.
+ See Documentation/devicetree/bindings/iio/adc/adc.txt.
+ properties:
+ reg:
+ description:
+ Index of this channel, must be starting from 0.
+ maxItems: 1
+
+ diff-channels:
+ description:
+ Positive input and negtive input of the ADC buffer of this channel.
+ Input candidates are defined in include/dt-bindings/iio/adc/adi,ad5940.h.
+ minItems: 2
+ maxItems: 2
+ items:
+ - description: Positive input channel
+ - enum:
+ - AD5940_ADC_INPUTP_EXCITATION
+ - AD5940_ADC_INPUTP_FLOATING
+ - AD5940_ADC_INPUTP_HSTIA
+ - AD5940_ADC_INPUTP_LPTIA_LP
+ - AD5940_ADC_INPUTP_AIN0
+ - AD5940_ADC_INPUTP_AIN1
+ - AD5940_ADC_INPUTP_AIN2
+ - AD5940_ADC_INPUTP_AIN3
+ - AD5940_ADC_INPUTP_AVDD_2
+ - AD5940_ADC_INPUTP_DVDD_2
+ - AD5940_ADC_INPUTP_AVDD_REG_2
+ - AD5940_ADC_INPUTP_TEMP
+ - AD5940_ADC_INPUTP_VBIAS_CAP
+ - AD5940_ADC_INPUTP_DE0
+ - AD5940_ADC_INPUTP_SE0
+ - AD5940_ADC_INPUTP_VREF_2V5_2
+ - AD5940_ADC_INPUTP_VREF_1V82
+ - AD5940_ADC_INPUTP_P_TEMP_N
+ - AD5940_ADC_INPUTP_AIN4
+ - AD5940_ADC_INPUTP_AIN6
+ - AD5940_ADC_INPUTP_VZERO
+ - AD5940_ADC_INPUTP_VBIAS0
+ - AD5940_ADC_INPUTP_VCE0
+ - AD5940_ADC_INPUTP_VRE0
+ - AD5940_ADC_INPUTP_VCE0_2
+ - AD5940_ADC_INPUTP_LPTIA
+ - AD5940_ADC_INPUTP_AGND_REF
+
+ - description: Negtive input channel
+ - enum:
+ # Negtive input candidates
+ - AD5940_ADC_INPUTN_FLOATING
+ - AD5940_ADC_INPUTN_HSTIA
+ - AD5940_ADC_INPUTN_LPTIA
+ - AD5940_ADC_INPUTN_AIN0
+ - AD5940_ADC_INPUTN_AIN1
+ - AD5940_ADC_INPUTN_AIN2
+ - AD5940_ADC_INPUTN_AIN3
+ - AD5940_ADC_INPUTN_VBIAS_CA8
+ - AD5940_ADC_INPUTN_TEMP_N
+ - AD5940_ADC_INPUTN_AIN4
+ - AD5940_ADC_INPUTN_AIN6
+ - AD5940_ADC_INPUTN_VZERO
+ - AD5940_ADC_INPUTN_VBIAS0
+ - AD5940_ADC_INPUTN_EXCITATION
+
+ channel-name:
+ description:
+ Any string format name you would like to assign to this channel.
+ maxItems: 1
+
+ required:
+ - reg
+ - diff-channels
+ - channel-name
+
+examples:
+ - |
+ ad5940: ad5940@0 {
+ compatible = "adi,ad5940";
+ reg = <0>;
+ spi-max-frequency = <16000000>;
+ vref-supply = <&adc_vref>;
+ interrupt-parent = <&gpio>;
+ interrupts = <24 2>;
+
+ adi,interrupt-io = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ diff-channels = <AD5940_ADC_INPUTP_VCE0
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "Vce-Vbias";
+ };
+
+ channel@1 {
+ reg = <1>;
+ diff-channels = <AD5940_ADC_INPUTP_VRE0
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "Vre-Vbias";
+ };
+
+ channel@2 {
+ reg = <2>;
+ diff-channels = <AD5940_ADC_INPUTP_SE0
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "Vse-Vbias";
+ };
+
+ channel@3 {
+ reg = <3>;
+ diff-channels = <AD5940_ADC_INPUTP_DE0
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "Vde-Vbias";
+ };
+
+ channel@4 {
+ reg = <4>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN0
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain0-Vbias";
+ };
+
+ channel@5 {
+ reg = <5>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN1
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain1-Vbias";
+ };
+
+ channel@6 {
+ reg = <6>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN2
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain2-Vbias";
+ };
+
+ channel@7 {
+ reg = <7>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN3
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain3-Vbias";
+ };
+
+ channel@8 {
+ reg = <8>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN4
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain4-Vbias";
+ };
+
+ channel@9 {
+ reg = <9>;
+ diff-channels = <AD5940_ADC_INPUTP_AIN6
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "ain6-Vbias";
+ };
+
+ channel@10 {
+ reg = <10>;
+ diff-channels = <AD5940_ADC_INPUTP_LPTIA_LP
+ AD5940_ADC_INPUTN_LPTIA>;
+ channel-name = "Low power TIA DC";
+ };
+
+ channel@11 {
+ reg = <11>;
+ diff-channels = <AD5940_ADC_INPUTP_LPTIA
+ AD5940_ADC_INPUTN_LPTIA>;
+ channel-name = "Low power TIA AC";
+ };
+
+ channel@12 {
+ reg = <12>;
+ diff-channels = <AD5940_ADC_INPUTP_HSTIA
+ AD5940_ADC_INPUTN_HSTIA>;
+ channel-name = "High Speed TIA";
+ };
+
+ channel@13 {
+ reg = <13>;
+ diff-channels = <AD5940_ADC_INPUTP_TEMP
+ AD5940_ADC_INPUTN_VBIAS0>;
+ channel-name = "Temperature";
+ };
+ };
diff --git a/include/dt-bindings/iio/adc/adi,ad5940.h b/include/dt-bindings/iio/adc/adi,ad5940.h
new file mode 100644
index 000000000000..c17826f2f654
--- /dev/null
+++ b/include/dt-bindings/iio/adc/adi,ad5940.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for configuring the AD5940 AFE
+ */
+
+#ifndef _DT_BINDINGS_IIO_ADC_AD5940_H
+#define _DT_BINDINGS_IIO_ADC_AD5940_H
+
+#define AD5940_ADC_INPUTN_FLOATING 0
+#define AD5940_ADC_INPUTN_HSTIA 1
+#define AD5940_ADC_INPUTN_LPTIA 2
+#define AD5940_ADC_INPUTN_AIN0 4
+#define AD5940_ADC_INPUTN_AIN1 5
+#define AD5940_ADC_INPUTN_AIN2 6
+#define AD5940_ADC_INPUTN_AIN3 7
+#define AD5940_ADC_INPUTN_VBIAS_CA8 10
+#define AD5940_ADC_INPUTN_TEMP_N 11
+#define AD5940_ADC_INPUTN_AIN4 12
+#define AD5940_ADC_INPUTN_AIN6 14
+#define AD5940_ADC_INPUTN_VZERO 16
+#define AD5940_ADC_INPUTN_VBIAS0 17
+#define AD5940_ADC_INPUTN_EXCITATION 20
+
+#define AD5940_ADC_INPUTP_FLOATING 0
+#define AD5940_ADC_INPUTP_HSTIA 1
+#define AD5940_ADC_INPUTP_LPTIA_LP 2
+#define AD5940_ADC_INPUTP_AIN0 4
+#define AD5940_ADC_INPUTP_AIN1 5
+#define AD5940_ADC_INPUTP_AIN2 6
+#define AD5940_ADC_INPUTP_AIN3 7
+#define AD5940_ADC_INPUTP_AVDD_2 8
+#define AD5940_ADC_INPUTP_DVDD_2 9
+#define AD5940_ADC_INPUTP_AVDD_REG_2 10
+#define AD5940_ADC_INPUTP_TEMP 11
+#define AD5940_ADC_INPUTP_VBIAS_CAP 12
+#define AD5940_ADC_INPUTP_DE0 13
+#define AD5940_ADC_INPUTP_SE0 14
+#define AD5940_ADC_INPUTP_VREF_2V5_2 16
+#define AD5940_ADC_INPUTP_VREF_1V82 18
+#define AD5940_ADC_INPUTP_P_TEMP_N 19
+#define AD5940_ADC_INPUTP_AIN4 20
+#define AD5940_ADC_INPUTP_AIN6 22
+#define AD5940_ADC_INPUTP_VZERO 23
+#define AD5940_ADC_INPUTP_VBIAS0 24
+#define AD5940_ADC_INPUTP_VCE0 25
+#define AD5940_ADC_INPUTP_VRE0 26
+#define AD5940_ADC_INPUTP_VCE0_2 31
+#define AD5940_ADC_INPUTP_LPTIA 33
+#define AD5940_ADC_INPUTP_AGND_REF 35
+#define AD5940_ADC_INPUTP_EXCITATION 36
+
+#endif /* _DT_BINDINGS_IIO_ADC_AD5940 */
--
2.17.1
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