This series extends the gpio-mux driver with optional enable GPIO support
to prevent glitches during channel transitions, then adds support for the
Analog Devices ADG2404 multiplexer as the first user of this feature.

The enable GPIO allows the multiplexer to be disabled before changing
address lines and re-enabled after, preventing brief activation of
unintended channels during transitions. This is particularly important
for precision analog applications.

The ADG2404 is a 4:1 analog multiplexer with low 0.62Ω on-resistance
that requires this enable GPIO functionality for glitch-free operation.

Changes in v3:
 * Extend gpio-mux driver instead of creating standalone adg2404 driver
 * Make enable GPIO optional for backward compatibility
 * Add MUX_IDLE_DISCONNECT support via enable GPIO

Antoniu Miclaus (4):
  dt-bindings: mux: gpio-mux: add enable-gpios support
  mux: gpio-mux: add support for enable GPIO
  dt-bindings: mux: gpio-mux: add adi,adg2404 support
  mux: gpio-mux: add adi,adg2404 support

 .../devicetree/bindings/mux/gpio-mux.yaml     | 26 ++++++++++++++-
 drivers/mux/gpio.c                            | 33 ++++++++++++++++++-
 2 files changed, 57 insertions(+), 2 deletions(-)

-- 
2.43.0

On Thu, Jan 15, 2026 at 02:18:18PM +0200, Antoniu Miclaus wrote:
> This series extends the gpio-mux driver with optional enable GPIO support
> to prevent glitches during channel transitions, then adds support for the
> Analog Devices ADG2404 multiplexer as the first user of this feature.
> 
> The enable GPIO allows the multiplexer to be disabled before changing
> address lines and re-enabled after, preventing brief activation of
> unintended channels during transitions. This is particularly important
> for precision analog applications.
> 
> The ADG2404 is a 4:1 analog multiplexer with low 0.62Ω on-resistance
> that requires this enable GPIO functionality for glitch-free operation.
> 
> Changes in v3:
>  * Extend gpio-mux driver instead of creating standalone adg2404 driver
>  * Make enable GPIO optional for backward compatibility
>  * Add MUX_IDLE_DISCONNECT support via enable GPIO

You are developing on some old kernel. You got stale Cc list of at least
three people! How could you for example get "johan+linaro@kernel.org" -
from which maintainer entry - but that at least is not bouncing like two
others.

You must use get_maintainers, not custom templates with fixed outdated
addresses.

Best regards,
Krzysztof

On Fri, Jan 16, 2026 at 09:37:36AM +0100, Krzysztof Kozlowski wrote:
> On Thu, Jan 15, 2026 at 02:18:18PM +0200, Antoniu Miclaus wrote:
> > This series extends the gpio-mux driver with optional enable GPIO support
> > to prevent glitches during channel transitions, then adds support for the
> > Analog Devices ADG2404 multiplexer as the first user of this feature.
> > 
> > The enable GPIO allows the multiplexer to be disabled before changing
> > address lines and re-enabled after, preventing brief activation of
> > unintended channels during transitions. This is particularly important
> > for precision analog applications.
> > 
> > The ADG2404 is a 4:1 analog multiplexer with low 0.62Ω on-resistance
> > that requires this enable GPIO functionality for glitch-free operation.
> > 
> > Changes in v3:
> >  * Extend gpio-mux driver instead of creating standalone adg2404 driver
> >  * Make enable GPIO optional for backward compatibility
> >  * Add MUX_IDLE_DISCONNECT support via enable GPIO
> 
> You are developing on some old kernel. You got stale Cc list of at least
> three people! How could you for example get "johan+linaro@kernel.org" -
> from which maintainer entry - but that at least is not bouncing like two
> others.

Probably from using get_maintainer.pl --git:

	$ scripts/get_maintainer.pl --git drivers/mux/gpio.c 
	Peter Rosin <peda@axentia.se> (maintainer:MULTIPLEXER SUBSYSTEM)
	Srinivas Kandagatla <srini@kernel.org> (commit_signer:1/2=50%,authored:1/2=50%,added_lines:5/6=83%)
	Krzysztof Kozlowski <krzk@kernel.org> (commit_signer:1/2=50%)
	Bartosz Golaszewski <brgl@kernel.org> (commit_signer:1/2=50%)
	David Lechner <dlechner@baylibre.com> (commit_signer:1/2=50%,authored:1/2=50%,added_lines:1/6=17%,removed_lines:3/3=100%)
	Johan Hovold <johan+linaro@kernel.org> (commit_signer:1/2=50%)
	linux-kernel@vger.kernel.org (open list)
	MULTIPLEXER SUBSYSTEM status: Odd Fixes

A recent mailmap is indeed needed to remap Bartosz's old address,
though.

Johan