[PATCH v3 4/4] arm64: dts: allwinner: h616: describe the UART integration and FIFO size
From: James Hilliard
Date: Sat Oct 24 2026 - 16:23:37 EST
Identify the H616 UART integration and describe its 256-byte transmit and
receive FIFOs on each of the six controllers. The specific compatible
selects the register layout and receive-trigger mapping, while fifo-size
provides the capacity that the component parameter register cannot report.
Retain snps,dw-apb-uart as the generic fallback. H618 includes this DTSI
and uses the same UART integration.
Signed-off-by: James Hilliard <james.hilliard1@xxxxxxxxx>
---
arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
index 1598e86259ab..a80f26ee0970 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
@@ -538,11 +538,12 @@ mmc2: mmc@4022000 {
};
uart0: serial@5000000 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05000000 0x400>;
interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART0>;
dmas = <&dma 14>, <&dma 14>;
dma-names = "tx", "rx";
@@ -551,11 +552,12 @@ uart0: serial@5000000 {
};
uart1: serial@5000400 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05000400 0x400>;
interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART1>;
dmas = <&dma 15>, <&dma 15>;
dma-names = "tx", "rx";
@@ -564,11 +566,12 @@ uart1: serial@5000400 {
};
uart2: serial@5000800 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05000800 0x400>;
interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART2>;
dmas = <&dma 16>, <&dma 16>;
dma-names = "tx", "rx";
@@ -577,11 +580,12 @@ uart2: serial@5000800 {
};
uart3: serial@5000c00 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05000c00 0x400>;
interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART3>;
dmas = <&dma 17>, <&dma 17>;
dma-names = "tx", "rx";
@@ -590,11 +594,12 @@ uart3: serial@5000c00 {
};
uart4: serial@5001000 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05001000 0x400>;
interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART4>;
dmas = <&dma 18>, <&dma 18>;
dma-names = "tx", "rx";
@@ -603,11 +608,12 @@ uart4: serial@5001000 {
};
uart5: serial@5001400 {
- compatible = "snps,dw-apb-uart";
+ compatible = "allwinner,sun50i-h616-uart", "snps,dw-apb-uart";
reg = <0x05001400 0x400>;
interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <4>;
+ fifo-size = <256>;
clocks = <&ccu CLK_BUS_UART5>;
dmas = <&dma 19>, <&dma 19>;
dma-names = "tx", "rx";
--
2.53.0