| Message ID | 20240909093101.14113-3-antoniu.miclaus@analog.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v3,1/3] input: touchscreem: ad7877: add match table | expand |
On Mon, Sep 09, 2024 at 12:30:13PM +0300, Antoniu Miclaus wrote: > Add device tree bindings for the ad7877 driver. > > Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> > --- > changes in v3: > - use strings for polarity. > - use unit siffix where applies. > - add defaults where applies. > - add complete example. > .../input/touchscreen/adi,ad7877.yaml | 109 ++++++++++++++++++ > 1 file changed, 109 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml > new file mode 100644 > index 000000000000..7603ce63af7e > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml > @@ -0,0 +1,109 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/input/touchscreen/adi,ad7877.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Analog Devices AD7877 Touch Screen Controller > + > +maintainers: > + - Antoniu Miclaus <antoniu.miclaus@analog.com> > + > +description: | > + Analog Devices Touch Screen Controller > + https://www.analog.com/media/en/technical-documentation/data-sheets/AD7877.pdf > + > +allOf: > + - $ref: touchscreen.yaml# > + - $ref: /schemas/spi/spi-peripheral-props.yaml# > + > +properties: > + compatible: > + enum: > + - adi,ad7877 > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + > + spi-max-frequency: > + description: AD7877 SPI bus clock frequency. > + minimum: 10000 > + maximum: 20000000 > + > + adi,stopacq-polarity: > + description: The polarity of the signal applied to the STOPACQ pin. > + $ref: /schemas/types.yaml#/definitions/string > + enum: [low, high] > + > + adi,first-conv-delay-ns: > + description: Delay in ns before the first conversion. > + enum: [500, 128000, 1000000, 8000000] > + > + adi,pen-down-acc-interval: > + description: Enable the ADC to repeatedly perform conversions. > + 0 = convert once > + 1 = every 0.5 ms > + 2 = every 1 ms > + 3 = every 8 ms > + $ref: /schemas/types.yaml#/definitions/uint32 > + enum: [0, 1, 2, 3] > + default: 0 You got the comment about using units, right? It applied *everywhere*. This is clearly a property in ms. > + > + adi,acquisition-time-us: > + description: Select acquisition times in us for the ADC. > + enum: [2, 4, 8, 16] What is the default? The property is not reuired, so how does it work without it? > + > + adi,vref-delay-us: > + description: Delay required for the SPI transfers depending on the VREF used. Same question. Best regards, Krzysztof
On Mon, Sep 09, 2024 at 12:30:13PM +0300, Antoniu Miclaus wrote:
> Add device tree bindings for the ad7877 driver.
Bindings are for hardware, not driver.
Subject: "add bindings" is quite redundant. Rather say what device you
are adding.
Best regards,
Krzysztof
diff --git a/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml new file mode 100644 index 000000000000..7603ce63af7e --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml @@ -0,0 +1,109 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/touchscreen/adi,ad7877.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD7877 Touch Screen Controller + +maintainers: + - Antoniu Miclaus <antoniu.miclaus@analog.com> + +description: | + Analog Devices Touch Screen Controller + https://www.analog.com/media/en/technical-documentation/data-sheets/AD7877.pdf + +allOf: + - $ref: touchscreen.yaml# + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7877 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + spi-max-frequency: + description: AD7877 SPI bus clock frequency. + minimum: 10000 + maximum: 20000000 + + adi,stopacq-polarity: + description: The polarity of the signal applied to the STOPACQ pin. + $ref: /schemas/types.yaml#/definitions/string + enum: [low, high] + + adi,first-conv-delay-ns: + description: Delay in ns before the first conversion. + enum: [500, 128000, 1000000, 8000000] + + adi,pen-down-acc-interval: + description: Enable the ADC to repeatedly perform conversions. + 0 = convert once + 1 = every 0.5 ms + 2 = every 1 ms + 3 = every 8 ms + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2, 3] + default: 0 + + adi,acquisition-time-us: + description: Select acquisition times in us for the ADC. + enum: [2, 4, 8, 16] + + adi,vref-delay-us: + description: Delay required for the SPI transfers depending on the VREF used. + + touchscreen-average-samples: + enum: [1, 4, 8, 16] + + touchscreen-x-plate-ohms: + default: 400 + + touchscreen-min-x: true + touchscreen-min-y: true + touchscreen-size-x: true + touchscreen-size-y: true + touchscreen-max-pressure: true + +required: + - compatible + - reg + - interrupts + - touchscreen-average-samples + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + spi { + #address-cells = <1>; + #size-cells = <0>; + + touchscreen@0 { + compatible = "adi,ad7877"; + reg = <0>; + spi-max-frequency = <20000000>; + interrupts = <21 IRQ_TYPE_EDGE_FALLING>; + interrupt-parent = <&gpio>; + adi,vref-delay-us = <100>; + adi,stopacq-polarity = "low"; + adi,first-conv-delay-ns = <500>; + adi,pen-down-acc-interval = <0>; + adi,acquisition-time-us = <2>; + touchscreen-average-samples = <16>; + touchscreen-x-plate-ohms = <400>; + touchscreen-min-x = <0>; + touchscreen-min-y = <0>; + touchscreen-size-x = <800>; + touchscreen-size-y = <480>; + touchscreen-max-pressure = <4095>; + }; + }; +...
Add device tree bindings for the ad7877 driver. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> --- changes in v3: - use strings for polarity. - use unit siffix where applies. - add defaults where applies. - add complete example. .../input/touchscreen/adi,ad7877.yaml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/adi,ad7877.yaml