[PATCH v2 6/7] arm64: dts: mediatek: mt8192: 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 its two uart controllers.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 arch/arm64/boot/dts/mediatek/mt8192.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
index 9f8f115edd4c..898953acdb61 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
@@ -741,6 +741,19 @@ spmi: spmi at 10027000 {
 			assigned-clock-parents = <&topckgen CLK_TOP_OSC_D10>;
 		};
 
+		apdma: dma-controller at 10217a80 {
+			compatible = "mediatek,mt8192-uart-dma", "mediatek,mt6835-uart-dma";
+			reg = <0 0x10217a80 0 0x80>, <0 0x10217b00 0 0x80>,
+			      <0 0x10217b80 0 0x80>, <0 0x10217c00 0 0x80>;
+			interrupts = <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH 0>,
+				     <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH 0>,
+				     <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH 0>,
+				     <GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH 0>;
+			clocks = <&infracfg CLK_INFRA_AP_DMA>;
+			#dma-cells = <1>;
+			dma-requests = <4>;
+		};
+
 		gce: mailbox at 10228000 {
 			compatible = "mediatek,mt8192-gce";
 			reg = <0 0x10228000 0 0x4000>;
@@ -765,6 +778,8 @@ uart0: serial at 11002000 {
 			interrupts = <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH 0>;
 			clocks = <&clk26m>, <&infracfg CLK_INFRA_UART0>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 0>, <&apdma 1>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
@@ -775,6 +790,8 @@ uart1: serial at 11003000 {
 			interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH 0>;
 			clocks = <&clk26m>, <&infracfg CLK_INFRA_UART1>;
 			clock-names = "baud", "bus";
+			dmas = <&apdma 2>, <&apdma 3>;
+			dma-names = "tx", "rx";
 			status = "disabled";
 		};
 
-- 
2.54.0