[PATCH 09/11] arm64: dts: st: add DMA support on U(S)ART instances of stm32mp25

Amelie Delaunay
2024-10-10T14:31:36Z

Add dmas and dma-names properties in u(s)art nodes of stm32mp251.dtsi to
enable DMA support.
RX channel requires to prevent pack/unpack feature of DMA to avoid losing
bytes when interrupting RX transfer, as it uses a cyclic buffer.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
arch/arm64/boot/dts/st/stm32mp251.dtsi | 27 +++++++++++++++++++++++++++
arch/arm64/boot/dts/st/stm32mp257f-ev1.dts | 2 ++
2 files changed, 29 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index 443cc8d6ae8e9e2bff1bb862b0921d9626bb78e1..02fcb9fcff87ba9d5c1ecab0385e3a57cde31e2e 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -269,6 +269,9 @@ usart2: serial@400e0000 {
reg = <0x400e0000 0x400>;
interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_USART2>;
+ dmas = <&hpdma 11 0x20 0x10012>,
+ <&hpdma 12 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 32>;
status = "disabled";
};
@@ -278,6 +281,9 @@ usart3: serial@400f0000 {
reg = <0x400f0000 0x400>;
interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_USART3>;
+ dmas = <&hpdma 13 0x20 0x10012>,
+ <&hpdma 14 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 33>;
status = "disabled";
};
@@ -287,6 +293,9 @@ uart4: serial@40100000 {
reg = <0x40100000 0x400>;
interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_UART4>;
+ dmas = <&hpdma 15 0x20 0x10012>,
+ <&hpdma 16 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 34>;
status = "disabled";
};
@@ -296,6 +305,9 @@ uart5: serial@40110000 {
reg = <0x40110000 0x400>;
interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_UART5>;
+ dmas = <&hpdma 17 0x20 0x10012>,
+ <&hpdma 18 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 35>;
status = "disabled";
};
@@ -396,6 +408,9 @@ usart6: serial@40220000 {
reg = <0x40220000 0x400>;
interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_USART6>;
+ dmas = <&hpdma 19 0x20 0x10012>,
+ <&hpdma 20 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 36>;
status = "disabled";
};
@@ -441,6 +456,9 @@ uart9: serial@402c0000 {
reg = <0x402c0000 0x400>;
interrupts = <GIC_SPI 150 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_UART9>;
+ dmas = <&hpdma 25 0x20 0x10012>,
+ <&hpdma 26 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 39>;
status = "disabled";
};
@@ -450,6 +468,9 @@ usart1: serial@40330000 {
reg = <0x40330000 0x400>;
interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_USART1>;
+ dmas = <&hpdma 9 0x20 0x10012>,
+ <&hpdma 10 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 31>;
status = "disabled";
};
@@ -483,6 +504,9 @@ uart7: serial@40370000 {
reg = <0x40370000 0x400>;
interrupts = <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_UART7>;
+ dmas = <&hpdma 21 0x20 0x10012>,
+ <&hpdma 22 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 37>;
status = "disabled";
};
@@ -492,6 +516,9 @@ uart8: serial@40380000 {
reg = <0x40380000 0x400>;
interrupts = <GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc CK_KER_UART8>;
+ dmas = <&hpdma 23 0x20 0x10012>,
+ <&hpdma 24 0x20 0x3021>;
+ dma-names = "rx", "tx";
access-controllers = <&rifsc 38>;
status = "disabled";
};
diff --git a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
index 214191a8322b81e7ae453503863b4465d9b625e0..d468dcbe849680de812a0ddd593f30cbf507f645 100644
--- a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
@@ -157,6 +157,8 @@ &usart2 {
pinctrl-0 = <&usart2_pins_a>;
pinctrl-1 = <&usart2_idle_pins_a>;
pinctrl-2 = <&usart2_sleep_pins_a>;
+ /delete-property/dmas;
+ /delete-property/dma-names;
status = "okay";
};

--
2.25.1