This series implements volume control for the pwm-beeper via sysfs. The first patch changes the devicetree documentation from txt to yaml. The original author of the following patches is Frieder Schrempf. I picked them from this [0] LKML thread from 2017. Since it looks like his email address changed in the meantime I changed it in the Author and Signed-off-by, as well as in the copyright statements. I did some minor changes on the patches that they apply and work with the current kernel. The last patch was added to fix loading/unloading of the driver. I recently posted a v6 [1], changes since v6: * Convert devicetree binding documentation from txt to yaml * Use DEVICE_ATTR_[RO|RW] properly * Change Frieders Mail address * Added Signed-off and Tested-by statements * Fix module unloading Regards Manuel [0] https://lore.kernel.org/all/cover.1487323753.git.frieder.schrempf@xxxxxxxxx/ [1] https://lkml.org/lkml/2023/1/24/379
