diff options
| author | Erwan Le Ray <erwan.leray@foss.st.com> | 2022-02-03 18:10:59 +0100 |
|---|---|---|
| committer | Alexandre Torgue <alexandre.torgue@foss.st.com> | 2022-02-25 10:53:15 +0100 |
| commit | 0f18f728ba6281fa63fde978fe8efb11d76aaef0 (patch) | |
| tree | d62511e209174472f23e57bddf9f7dd043999605 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 7a5faaee0d2e6f60897eed43366d8b541ea7882c (diff) | |
ARM: dts: stm32: add DMA configuration to UART nodes on stm32mp151
Add DMA configuration in stm32mp15x uart nodes by selecting dma direct
mode and alternate REQ/ACK dma protocol for uart.
DMA direct mode allows to bypass DMA FIFO. Each DMA request immediately
initiates a transfer from/to the memory. This allows USART to get data
transferred, even when the transfer ends before the DMA FIFO completion.
Default REQ/ACK DMA protocol consists in maintaining ACK signal up to the
removal of REQuest and the transfer completion.
In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the
removal of the REQuest, but only the transfer completion.
Due to a possible DMA stream lock when transferring data to/from STM32
USART/UART, select this alternative protocol in STM32 USART/UART nodes.
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions