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| author | Matti Vaittinen <mazziesaccount@gmail.com> | 2025-08-11 11:52:04 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2025-08-16 15:21:21 +0300 |
| commit | 261b90763fc4d51637abd44ae248a6183fc2de4d (patch) | |
| tree | 89143ddbe98bede4781022cf420f9b3e9bf15502 | |
| parent | 260bb98ce3df870ef3d73361f6918463bc88a5b6 (diff) | |
| download | linux-261b90763fc4d51637abd44ae248a6183fc2de4d.tar.xz | |
dt-bindings: iio: adc: ad7476: Add ROHM bd79105
The ROHM BD79105 is a simple, 16-bit, 1-channel ADC with a 'CONVSTART'
pin used to start the ADC conversion. Other than the 'CONVSTART', there
are 3 supply pins (one used as a reference), analog inputs, ground and
communication pins. It's worth noting that the pin somewhat confusingly
labeled as 'DIN', is a pin which should be used as a chip-select. The IC
does not have any writable registers.
The device is designed so that the output pin can, in addition to
outputting the data, be used as a 'data-ready'-IRQ. There are cases
where the IRQ can't be used (because it is delivered via SPI data-line).
Hence, some systems may use a GPIO for polling the data readiness.
Add a compatible for the bd79105 and add the data-ready GPIO to the
binding.
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/3f70f68665225be3091f8a0412e74037b6a2a88e.1754901948.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
| -rw-r--r-- | Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml index db2a9662bd94..55880191c511 100644 --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml @@ -41,6 +41,7 @@ properties: - adi,ad7910 - adi,ad7920 - adi,ad7940 + - rohm,bd79105 - ti,adc081s - ti,adc101s - ti,adc121s @@ -55,6 +56,11 @@ properties: reg: maxItems: 1 + interrupts: + description: + The data-ready interrupt. Provided via DOUT pin. + maxItems: 1 + vcc-supply: description: Main powersupply voltage for the chips, sometimes referred to as VDD on @@ -75,6 +81,10 @@ properties: description: A GPIO used to trigger the start of a conversion maxItems: 1 + rdy-gpios: + description: A GPIO for detecting the data-ready. + maxItems: 1 + required: - compatible - reg @@ -82,6 +92,20 @@ required: allOf: - $ref: /schemas/spi/spi-peripheral-props.yaml# +# Devices with an IRQ + - if: + properties: + compatible: + contains: + enum: + - rohm,bd79105 + then: + properties: + interrupts: true + else: + properties: + interrupts: false + # Devices where reference is vcc - if: properties: @@ -116,6 +140,7 @@ allOf: - adi,ad7274 - adi,ad7475 - lltc,ltc2314-14 + - rohm,bd79105 then: properties: vref-supply: false @@ -129,6 +154,7 @@ allOf: - adi,ad7274 - adi,ad7475 - lltc,ltc2314-14 + - rohm,bd79105 then: required: - vref-supply @@ -140,9 +166,23 @@ allOf: enum: - adi,ad7475 - adi,ad7495 + - rohm,bd79105 then: properties: vdrive-supply: false + + # Devices which support polling the data-ready via GPIO + - if: + not: + properties: + compatible: + contains: + enum: + - rohm,bd79105 + then: + properties: + rdy-gpios: false + - if: not: properties: @@ -151,10 +191,22 @@ allOf: enum: - adi,ad7091 - adi,ad7091r + - rohm,bd79105 then: properties: adi,conversion-start-gpios: false + # Devices with a convstart GPIO where it is not optional + - if: + properties: + compatible: + contains: + enum: + - rohm,bd79105 + then: + required: + - adi,conversion-start-gpios + unevaluatedProperties: false examples: |