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author | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2021-07-09 10:53:37 +0300 |
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committer | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2021-07-27 10:47:40 +0300 |
commit | 2a7034c77d628627c9462e27865e2d9258aeadd0 (patch) | |
tree | bd25a731bce90adcc5a204213616cdc67202255b /drivers/clk | |
parent | 8b71b20e0e5431f0243a5a8078ac62be0af2189e (diff) | |
download | u-boot-2a7034c77d628627c9462e27865e2d9258aeadd0.tar.xz |
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>
Diffstat (limited to 'drivers/clk')
0 files changed, 0 insertions, 0 deletions