linux-kernel - Re: [PATCH 2/2] input: ps2-gpio: enforce and document open drain

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Message-ID: <ce5ccbbc-0419-ae3d-5ab1-f8985cb7e792@canonical.com>
Date:   Mon, 14 Feb 2022 22:50:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Danilo Krummrich <danilokrummrich@...develop.de>,
        dmitry.torokhov@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linus.walleij@...aro.org
Subject: Re: [PATCH 2/2] input: ps2-gpio: enforce and document open drain

On 12/02/2022 00:31, Danilo Krummrich wrote:
> The PS/2 bus defines the data and clock line be open drain, therefore
> document this in the dt-binding and enforce the particular flag in the
> driver.
> 
> Without enforcing to flag at least the clock gpio as open drain we run
> into the following warning:
> 
> WARNING: CPU: 1 PID: 40 at drivers/gpio/gpiolib.c:3175 gpiochip_enable_irq+0x54/0x90
> 
> gpiochip_enable_irq() warns on a GPIO being configured as output and
> using IRQ without being flagged as open drain.
> 
> Signed-off-by: Danilo Krummrich <danilokrummrich@...develop.de>
> ---
>  .../devicetree/bindings/serio/ps2-gpio.yaml        | 14 ++++++++++----
>  drivers/input/serio/ps2-gpio.c                     |  9 +++++++--
>  2 files changed, 17 insertions(+), 6 deletions(-)
> 

Bindings as separate patch, please.

Best regards,
Krzysztof