[PATCH v2 2/7] arm64: dts: mediatek: mt8173: Add and use UART AP_DMA controller

[AngeloGioacchino Del Regno]

This SoC has a DMA controller (AP_DMA) that provides one channel
for each data direction (transmit and receive) for all of the
UART controllers in the SoC.

In order to increase the efficiency of data TX/RX over the UART
controllers, add the UART DMA controller and assign the right
channels to each of the four UART controllers.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 arch/arm64/boot/dts/mediatek/mt8173.dtsi | 27 ++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
index 78c2ccd5be13..7297225f61c9 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
@@ -673,6 +673,25 @@ gic: interrupt-controller at 10221000 {
 				(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
 		};
 
+		apdma: dma-controller at 11000300 {
+			compatible = "mediatek,mt8173-uart-dma", "mediatek,mt6577-uart-dma";
+			reg = <0 0x11000300 0 0x80>, <0 0x11000380 0 0x80>,
+			      <0 0x11000400 0 0x80>, <0 0x11000480 0 0x80>,
+			      <0 0x11000500 0 0x80>, <0 0x11000580 0 0x80>,
+			      <0 0x11000600 0 0x80>, <0 0x11000680 0 0x80>;
+			interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 96 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 97 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 98 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 99 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 100 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 101 IRQ_TYPE_LEVEL_LOW>,
+				     <GIC_SPI 102 IRQ_TYPE_LEVEL_LOW>;
+			clocks = <&pericfg CLK_PERI_AP_DMA>;
+			#dma-cells = <1>;
+			dma-requests = <8>;
+		};
+
 		auxadc: auxadc at 11001000 {
 			compatible = "mediatek,mt8173-auxadc";
 			reg = <0 0x11001000 0 0x1000>;
@@ -688,6 +707,8 @@ uart0: serial at 11002000 {
 			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_LOW>;
 			clocks = <&pericfg CLK_PERI_UART0_SEL>, <&pericfg CLK_PERI_UART0>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 0>, <&apdma 1>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
@@ -698,6 +719,8 @@ uart1: serial at 11003000 {
 			interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_LOW>;
 			clocks = <&pericfg CLK_PERI_UART1_SEL>, <&pericfg CLK_PERI_UART1>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 2>, <&apdma 3>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
@@ -708,6 +731,8 @@ uart2: serial at 11004000 {
 			interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_LOW>;
 			clocks = <&pericfg CLK_PERI_UART2_SEL>, <&pericfg CLK_PERI_UART2>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 4>, <&apdma 5>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
@@ -718,6 +743,8 @@ uart3: serial at 11005000 {
 			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_LOW>;
 			clocks = <&pericfg CLK_PERI_UART3_SEL>, <&pericfg CLK_PERI_UART3>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 6>, <&apdma 7>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
-- 
2.54.0