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u-boot/board/st/stm32mp1
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Patrick Delaunay 2a7034c77d stm32mp1: add pull-up for gpio button PA13 and PA14 
When a push-button is released and PA13/PA14 are defined as input (high-Z)
the LED should not be active as the circuit is open but a small current
leak through PCB or push-button close the circuit and allows a small LED
bias giving erroneous level voltage.

So it is recommended to activate an internal pull-up in order to clearly
fix the voltage at PA13/PA14 when button is released and to wait
a short delay before to read the GPIO value only when the pull-up is
correctly configured.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-07-27 09:47:40 +02:00
..
extlinux.conf stm32mp1: add example files for FIT generation 2019-08-27 11:19:23 +02:00
fit_copro_kernel_dtb.its board: st: stm32mp1: update load address for FIT examples 2020-11-25 14:27:19 +01:00
fit_kernel_dtb.its board: st: stm32mp1: update load address for FIT examples 2020-11-25 14:27:19 +01:00
Kconfig stm32mp1: split board and SOC support for STM32MP15x family 2020-01-17 13:58:27 +01:00
MAINTAINERS Correct U-Boot upstream repository 2021-02-28 13:57:30 -05:00
Makefile board: stm32mp1: move the function board_debug_uart_init in spl.c 2020-07-07 16:01:23 +02:00
README doc: add board documentation for stm32mp1 2020-03-02 09:41:32 +01:00
spl.c board: stm32mp1: move the function board_debug_uart_init in spl.c 2020-07-07 16:01:23 +02:00
stm32mp1.c stm32mp1: add pull-up for gpio button PA13 and PA14 2021-07-27 09:47:40 +02:00

README 

see doc/board/st/stm32mp1.rst