dts: Provide Serial-wire / JTAG pin description #180
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"-" could be used in signal names in .xml files. This character is not allowed in dts format so replace it by "_" before generation. Signed-off-by: Erwan Gouriou <[email protected]>
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gautierg-st
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Jan 17, 2024
Generate Serial Wire and JTAG port pins definitions. The particularity of these signals is that they are part of default SoC boot time configuration (in order to enable debug at boot time with no SW configuration required). The reason we need to define them is to enable the ability to set JTAG port pins in analog mode when they are not needed in order to save power (set them to analog). Today, the use case of dynamic configuration from analog back to a functional SWJ state is not taken into account, hence we're not generating the complete pin configuration (including possible pull-down or slew-rate combinations). Similarly, we're not generating these signals on STM32F1 as default SoC configuration is analog state. Hence no need to be taken into account for the required functionality. Signed-off-by: Erwan Gouriou <[email protected]>
SWJ signals have been generated. Signed-off-by: Erwan Gouriou <[email protected]>
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gautierg-st
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Jan 18, 2024
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Provide Serial Wire / JTAG signal description.
Aim is to provide the ability to disable them (set to analog) in case is it possible and power consumption matters.
We don't provide a full extent description (speed, pull-down, ..) as there is no intention to support runtime change
of state from sleep to functional mode.