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| 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 /arch/arm/boot/dts/stm32mp151.dtsi | |
| parent | ARM: dts: stm32: use exti 19 as main interrupt to support RTC wakeup on stm32... (diff) | |
| download | linux-0f18f728ba6281fa63fde978fe8efb11d76aaef0.tar.xz linux-0f18f728ba6281fa63fde978fe8efb11d76aaef0.zip | |
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 'arch/arm/boot/dts/stm32mp151.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/stm32mp151.dtsi | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi index f26697330c0c..2171e7a97e92 100644 --- a/arch/arm/boot/dts/stm32mp151.dtsi +++ b/arch/arm/boot/dts/stm32mp151.dtsi @@ -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"; }; |