[04/40] dt-bindings: iio: adc: ti,am3359-adc: New yaml description

This ADC was already described in a text file also containing an MFD
description an a touchscreen description:
Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
Let's add a proper description for this hardware.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 .../bindings/iio/adc/ti,am3359-adc.yaml       | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml

On Wed, 25 Aug 2021 17:24:42 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> This ADC was already described in a text file also containing an MFD
> description an a touchscreen description:
> Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
> Let's add a proper description for this hardware.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Hi Miquel,

We'd do this different today, but this seems to be an accurate conversion
of what we have.  I'll assume this series may well go via mfd, so

Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  .../bindings/iio/adc/ti,am3359-adc.yaml       | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml b/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> new file mode 100644
> index 000000000000..85d9d642dc67
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,am3359-adc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI AM3359 ADC
> +
> +maintainers:
> +  - Miquel Raynal <miquel.raynal@bootlin.com>
> +
> +properties:
> +  compatible:
> +    const: ti,am3359-adc
> +
> +  '#io-channel-cells':
> +    const: 1
> +
> +  ti,adc-channels:
> +    description: List of analog inputs available for ADC. AIN0 = 0, AIN1 = 1 and
> +      so on untill AIN7 = 7.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 8
> +
> +  ti,chan-step-opendelay:
> +    description: List of open delays for each channel of ADC in the order of
> +      ti,adc-channels. The value corresponds to the number of ADC clock cycles
> +      to wait after applying the step configuration registers and before sending
> +      the start of ADC conversion. Maximum value is 0x3FFFF.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 8
> +
> +  ti,chan-step-sampledelay:
> +    description: List of sample delays for each channel of ADC in the order of
> +      ti,adc-channels. The value corresponds to the number of ADC clock cycles
> +      to sample (to hold start of conversion high). Maximum value is 0xFF.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 8
> +
> +  ti,chan-step-avg:
> +    description: Number of averages to be performed for each channel of ADC. If
> +      average is 16 (this is also the maximum) then input is sampled 16 times
> +      and averaged to get more accurate value. This increases the time taken by
> +      ADC to generate a sample. Maximum value is 16.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 1
> +    maxItems: 8
> +
> +required:
> +  - compatible
> +  - '#io-channel-cells'
> +  - ti,adc-channels
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    tscadc: tscadc@0 {
> +        compatible = "ti,am3359-tscadc";
> +        reg = <0x0 0x1000>;
> +        interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&adc_tsc_fck>;
> +        clock-names = "fck";
> +        status = "disabled";
> +        dmas = <&edma 53 0>, <&edma 57 0>;
> +        dma-names = "fifo0", "fifo1";
> +
> +        adc {
> +            compatible = "ti,am3359-adc";
> +            #io-channel-cells = <1>;
> +            ti,adc-channels = <4 5 6 7>;
> +            ti,chan-step-opendelay = <0x098 0x3ffff 0x098 0x0>;
> +            ti,chan-step-sampledelay = <0xff 0x0 0xf 0x0>;
> +            ti,chan-step-avg = <16 2 4 8>;
> +        };
> +    };