On Mon, 21 Jun 2021 20:20:52 +0300, Mauri Sandberg wrote:

Add documentation for a general GPIO cascade. It allows building
one-to-many cascades of GPIO lines using multiplexer to choose
the cascaded line.

Signed-off-by: Mauri Sandberg <redacted>
---
v4 -> v5:
 - renamed gpio-mux-input -> gpio-cascade
 - changed vague term 'pin' to 'upstream line'
 - added more verbose description for the module
 - added missing 'mux-controls' entry
 - dropped Tested-by and Reviewed-by due to changes in bindings
v3 -> v4:
 - Changed author email
 - Included Tested-by and Reviewed-by from Drew
v2 -> v3: added a complete example on dual 4-way multiplexer
v1 -> v2: added a little bit more text in the binding documenation
---
 .../bindings/gpio/gpio-cascade.yaml           | 103 ++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-cascade.yaml

Reviewed-by: Rob Herring <robh@kernel.org>