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

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Message-ID: <Ygra3pOhcE18nXRj@pollux>
Date:   Mon, 14 Feb 2022 23:42:38 +0100
From:   Danilo Krummrich <danilokrummrich@...develop.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, linus.walleij@...aro.org
Subject: Re: [PATCH 2/2] input: ps2-gpio: enforce and document open drain

On Mon, Feb 14, 2022 at 10:50:21PM +0100, Krzysztof Kozlowski wrote:
> 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.
Are you fine with adding this additional documentation directly to the patch
converting the binding to a json-schema or do you prefer it to be a separate
patch?
> 
> Best regards,
> Krzysztof

- Danilo