Re: [PATCH v1] Documentation: gpio: pca953x: clarify interrupt source detection

[Linus Walleij]

On Wed, Jan 7, 2026 at 10:31 AM Ernest Van Hoecke
<ernestvanhoecke@xxxxxxxxx> wrote:

> From: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
>
> There are multiple design tradeoffs and considerations in how the
> PCA953x driver detects the source(s) of an interrupt. This driver
> supports PCAL variants with input latching, a feature that is
> constrained by the fact that the interrupt status and input port
> registers cannot be read atomically. These limits and the design
> decisions deserve an in-depth explanation.
>
> Update the documentation to clarify these hardware limits and describe
> how the driver determines pending interrupts, and how it makes use of
> the PCAL input latching.
>
> Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>

Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>

Yours,
Linus Walleij