arm64: dts: st: add DMA support on U(S)ART instances of stm32mp25

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>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: ADESTM

arch/arm64/boot/dts/st/stm32mp251.dtsi

@@ -266,6 +266,9 @@
 				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";
 			};
@@ -275,6 +278,9 @@
 				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";
 			};
@@ -284,6 +290,9 @@
 				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";
 			};
@@ -293,6 +302,9 @@
 				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";
 			};
@@ -393,6 +405,9 @@
 				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";
 			};
@@ -438,6 +453,9 @@
 				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";
 			};
@@ -447,6 +465,9 @@
 				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";
 			};
@@ -480,6 +501,9 @@
 				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";
 			};
@@ -489,6 +513,9 @@
 				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";
 			};

arch/arm64/boot/dts/st/stm32mp257f-ev1.dts

@@ -161,6 +161,8 @@
 	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";
 };