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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>
This commit is contained in:
Erwan Le Ray 2022-02-03 18:10:59 +01:00 committed by Alexandre Torgue
parent 7a5faaee0d
commit 0f18f728ba
1 changed files with 21 additions and 0 deletions
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21
arch/arm/boot/dts/stm32mp151.dtsi
View File

@ -455,6 +455,9 @@
interrupts-extended = <&exti 27 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc USART2_K>;
wakeup-source;
dmas = <&dmamux1 43 0x400 0x15>,
<&dmamux1 44 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -464,6 +467,9 @@
interrupts-extended = <&exti 28 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc USART3_K>;
wakeup-source;
dmas = <&dmamux1 45 0x400 0x15>,
<&dmamux1 46 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -473,6 +479,9 @@
interrupts-extended = <&exti 30 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc UART4_K>;
wakeup-source;
dmas = <&dmamux1 63 0x400 0x15>,
<&dmamux1 64 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -482,6 +491,9 @@
interrupts-extended = <&exti 31 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc UART5_K>;
wakeup-source;
dmas = <&dmamux1 65 0x400 0x15>,
<&dmamux1 66 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -588,6 +600,9 @@
interrupts-extended = <&exti 32 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc UART7_K>;
wakeup-source;
dmas = <&dmamux1 79 0x400 0x15>,
<&dmamux1 80 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -597,6 +612,9 @@
interrupts-extended = <&exti 33 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc UART8_K>;
wakeup-source;
dmas = <&dmamux1 81 0x400 0x15>,
<&dmamux1 82 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};
@ -678,6 +696,9 @@
interrupts-extended = <&exti 29 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc USART6_K>;
wakeup-source;
dmas = <&dmamux1 71 0x400 0x15>,
<&dmamux1 72 0x400 0x11>;
dma-names = "rx", "tx";
status = "disabled";
};