Build_pinctrl_for-bullseye.md

Building 'pinctrl' on a bullseye or bookworm system

This recipe is for building the latest version of pinctrl on a bullseye system (aka .oldstable). pinctrl is a potentially useful adjunct in our testing and experimentation with libgpiod.

1. pinctrl is a member of the utils repo at the Raspberry Pi GitHub site. For reasons that are not clear to me, cloning this repo is a two-step process:

   • Go to the GitHub site, and "fork" the 'utils' repo to your GitHub account

   • From your RPi, execute a git clone https://github.com/seamusdemora/utils

     note: you should use your clone, not mine, as I'm unlikely to keep mine updated)

2. Get some tools:

   $ sudo apt update
   $ sudo apt install cmake device-tree-compiler libfdt-dev

3. Build it following the instructions in the GitHub repo

   $ cd ~/utils/pinctrl
   $ cmake .
   $ make
   $ sudo make install
     ...
     -- Installing: /usr/local/bin/pinctrl
     ...
   $ pinctrl help | less    # to access the documentation 

And that concludes this recipe - for now.