diff mbox series

[v3,3/3] dt-bindings: touchscreen: ad7877: add bindings

Message ID 20240909093101.14113-3-antoniu.miclaus@analog.com
State Superseded
Headers show
Series [v3,1/3] input: touchscreem: ad7877: add match table | expand

Commit Message

Antoniu Miclaus Sept. 9, 2024, 9:30 a.m. UTC 
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

Comments

Krzysztof Kozlowski Sept. 9, 2024, 10:09 a.m. UTC | #1 
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
diff mbox series

Patch

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>;
+      };
+    };
+...