Hi All,
This patchset adds all building blocks needed for checking the 'Function' button state in the boot script on Amlogic A311D based VIM3 board. This button is connected to the ADC lines of the SoC, so it required to enable meson SARADC, the clocks needed for it and a simple button-adc drivers.
Once applied, one can use following commands in the boot scripts: -->8--- echo Checking Func button state: \c if button Function then echo Selected alternative boot ... fi --->8---
Best regards Marek Szyprowski Samsung R&D Institute Poland
Changelog: v5: - rebased onto latest uboot-amlogic/u-boot-amlogic-next branch - synchronized adc-keys binding with the recent version from the Linux kernel - updated adc-keys driver to match behavior from dt-bindings - added a patch for meson-saradc driver to register vdd reference supply to the ADC framework
v4: https://lists.denx.de/pipermail/u-boot/2020-December/435641.html - rebased onto uboot-amlogic/u-boot-amlogic-next and dropped merged patches - added adc-keys bindings docs (copied from Linux kernel) - minor code adjustments pointed by Simon - enabled driver also in khadas-vim3l_defconfig
v3: https://lists.denx.de/pipermail/u-boot/2020-December/435072.html - removed 'button' env variable - extended kconfig and patch descriptions
v2: https://lists.denx.de/pipermail/u-boot/2020-December/434991.html - removed Change-Id tags - split defconfig changes into ADC and button related
v1: https://lists.denx.de/pipermail/u-boot/2020-December/434875.html - initial submission
Patch summary:
Marek Szyprowski (4): dt-bindings: input: adc-keys bindings documentation button: add a simple Analog to Digital Converter device based button driver adc: meson-saradc: add support for getting reference voltage value configs: khadas-vim3(l): enable Function button support
configs/khadas-vim3_defconfig | 2 + configs/khadas-vim3l_defconfig | 2 + doc/device-tree-bindings/input/adc-keys.txt | 67 +++++++++ drivers/adc/meson-saradc.c | 21 +++ drivers/button/Kconfig | 8 + drivers/button/Makefile | 1 + drivers/button/button-adc.c | 156 ++++++++++++++++++++ 7 files changed, 257 insertions(+) create mode 100644 doc/device-tree-bindings/input/adc-keys.txt create mode 100644 drivers/button/button-adc.c