dts: Provide Serial-wire / JTAG pin description #180
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
erwango
force-pushed
the
dev/pin_jtag_port_gen
branch
from
250d891
to
f68b72b
Compare
"-" 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 <erwan.gouriou@st.com>
erwango
force-pushed
the
dev/pin_jtag_port_gen
branch
from
f68b72b
to
aca26e9
Compare
gautierg-st
reviewed
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 <erwan.gouriou@st.com>
SWJ signals have been generated. Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
erwango
force-pushed
the
dev/pin_jtag_port_gen
branch
from
300ca88
to
c5d5776
Compare
gautierg-st
approved these changes
Jan 18, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.