[v4,1/2] dt-bindings: HID: i2c-hid: ilitek: Introduce bindings for Ilitek ili9882t

The ili9882t touch screen chip same as Elan eKTH6915 controller
has a reset gpio. The difference is that ili9882t needs to use
vccio-supply instead of vcc33-supply. Doug's series[1] allows panels
and touchscreens to power on/off together, let's add a phandle for this.

[1]: https://lore.kernel.org/r/20230607215224.2067679-1-dianders@chromium.org

Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
---
 .../bindings/input/ilitek,ili9882t.yaml       | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml

Hi,

On Thu, Jun 8, 2023 at 6:02 AM Cong Yang
<yangcong5@huaqin.corp-partner.google.com> wrote:
>
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/ilitek,ili9882t.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ilitek ili9882t touchscreen controller
> +
> +maintainers:
> +  - Dmitry Torokhov <dmitry.torokhov@gmail.com>

Has Dmitry agreed to be the maintainer here? Traditionally when adding
a new file one lists themselves.


> +description:
> +  Supports the Ilitek ili9882t touchscreen controller.
> +  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
> +
> +allOf:
> +  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    const: ilitek,ili9882t
> +
> +  reg:
> +    const: 0x41
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  panel: true
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: Reset GPIO.
> +
> +
> +  vccio-supply:
> +    description: The 1.8V supply to the touchscreen.

Why two blank lines between reset-gpios and vccio-supply?


> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - vccio-supply

I think you want "panel" as a required property too, right?


> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      touchscreen: touchscreen@41 {
> +        compatible = "ilitek,ili9882t";
> +        reg = <0x41>;
> +
> +        interrupt-parent = <&pio>;
> +        interrupts = <12 IRQ_TYPE_LEVEL_LOW>;
> +
> +        reset-gpios = <&pio 60 GPIO_ACTIVE_LOW>;
> +        vccio-supply = <&mt6366_vio18_reg>;

...and "panel" would also need to go in the above example.

On 08/06/2023 15:01, Cong Yang wrote:
> The ili9882t touch screen chip same as Elan eKTH6915 controller
> has a reset gpio. The difference is that ili9882t needs to use
> vccio-supply instead of vcc33-supply. Doug's series[1] allows panels
> and touchscreens to power on/off together, let's add a phandle for this.
> 
> [1]: https://lore.kernel.org/r/20230607215224.2067679-1-dianders@chromium.org
> 
> Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
> ---
>  .../bindings/input/ilitek,ili9882t.yaml       | 66 +++++++++++++++++++
>  1 file changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> new file mode 100644
> index 000000000000..89584264d6a2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/ilitek,ili9882t.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ilitek ili9882t touchscreen controller
> +
> +maintainers:
> +  - Dmitry Torokhov <dmitry.torokhov@gmail.com>

This usually should not be subsystem maintainer.

> +
> +description:
> +  Supports the Ilitek ili9882t touchscreen controller.
> +  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
> +
> +allOf:
> +  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    const: ilitek,ili9882t
> +
> +  reg:
> +    const: 0x41
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  panel: true
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: Reset GPIO.
> +
> +

Just one blank line.

> +  vccio-supply:
> +    description: The 1.8V supply to the touchscreen.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - vccio-supply
> +
> +additionalProperties: false

Why do you disallow all properties from toouchscreen.yaml? Aren't they
applicable?



Best regards,
Krzysztof

Hi,

On Fri, Jun 9, 2023 at 8:50 AM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> > +  vccio-supply:
> > +    description: The 1.8V supply to the touchscreen.
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - vccio-supply
> > +
> > +additionalProperties: false
>
> Why do you disallow all properties from toouchscreen.yaml? Aren't they
> applicable?

This matches what hid-over-i2c.yaml does. It only picks
`touchscreen-inverted-x` and `touchscreen-inverted-y` from the common
file, which aren't needed here. I assume that the rest of the things
from the common file can be probed using the i2c-hid protocol?

-Doug

On 09/06/2023 17:56, Doug Anderson wrote:
> Hi,
> 
> On Fri, Jun 9, 2023 at 8:50 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>>> +  vccio-supply:
>>> +    description: The 1.8V supply to the touchscreen.
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - interrupts
>>> +  - vccio-supply
>>> +
>>> +additionalProperties: false
>>
>> Why do you disallow all properties from toouchscreen.yaml? Aren't they
>> applicable?
> 
> This matches what hid-over-i2c.yaml does. It only picks
> `touchscreen-inverted-x` and `touchscreen-inverted-y` from the common
> file, which aren't needed here. I assume that the rest of the things
> from the common file can be probed using the i2c-hid protocol?

OK

Best regards,
Krzysztof