linux-kernel - Re: [PATCH v2 2/4] Documentation: DT: bindings: input: Add documentation for cyttsp5

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Date:   Fri, 5 Nov 2021 15:21:54 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        mylene.josserand@...e-electrons.com, linus.walleij@...aro.org,
        rydberg@...math.org, dmitry.torokhov@...il.com, robh+dt@...nel.org,
        alistair23@...il.com
Subject: Re: [PATCH v2 2/4] Documentation: DT: bindings: input: Add
 documentation for cyttsp5

Hi,

I finally found time to test this.

On Wed,  3 Nov 2021 21:48:28 +1000
Alistair Francis <alistair@...stair23.me> wrote:

[...]
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        touchscreen@24 {
> +            compatible = "cypress,tt2100";
> +            reg = <0x24>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&tp_reset_ds203>;
> +            interrupt-parent = <&pio>;
> +            interrupts = <1 5 IRQ_TYPE_LEVEL_LOW>;
hmm, in the code is IRQ_TRIGGER_FALLING but here is LEVEL_LOW, hmm what
it is really?

> +            reset-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>;

hmm, if the reset gpio at the chip is active low (I guess it is) that
would indicate an inverter between SoC and gpio. So a nonstandard setup
as an example, probably not a good idea.

Regards,
Andreas