* [PATCH] arm64: dts: rockchip: Add dma-names to RK356x UART nodes
@ 2026-10-08 15:36 Jun Yan
2026-10-09 1:47 ` Jun Yan
0 siblings, 1 reply; 2+ messages in thread
From: Jun Yan @ 2026-10-08 15:36 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Heiko Stuebner
Cc: Jun Yan, devicetree, linux-arm-kernel, linux-rockchip,
linux-kernel
The RK356x UART nodes define a dmas property but omit the matching
dma-names property, so the 8250 driver fails to request a DMA channel
and falls back to PIO, logging:
of_dma_request_slave_channel: dma-names property of node
'/serial@fe650000' missing or empty
Add the missing dma-names = "tx", "rx" to uart0 through uart9,
matching other Rockchip SoCs such as the RK3308.
Signed-off-by: Jun Yan <jerrysteve1101@gmail.com>
---
arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
index a5832895bd39..098493c04ecc 100644
--- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
@@ -443,6 +443,7 @@ uart0: serial@fdd50000 {
clocks = <&pmucru SCLK_UART0>, <&pmucru PCLK_UART0>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 0>, <&dmac0 1>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1449,6 +1450,7 @@ uart1: serial@fe650000 {
clocks = <&cru SCLK_UART1>, <&cru PCLK_UART1>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 2>, <&dmac0 3>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart1m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1463,6 +1465,7 @@ uart2: serial@fe660000 {
clocks = <&cru SCLK_UART2>, <&cru PCLK_UART2>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 4>, <&dmac0 5>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart2m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1477,6 +1480,7 @@ uart3: serial@fe670000 {
clocks = <&cru SCLK_UART3>, <&cru PCLK_UART3>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 6>, <&dmac0 7>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart3m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1491,6 +1495,7 @@ uart4: serial@fe680000 {
clocks = <&cru SCLK_UART4>, <&cru PCLK_UART4>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 8>, <&dmac0 9>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart4m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1505,6 +1510,7 @@ uart5: serial@fe690000 {
clocks = <&cru SCLK_UART5>, <&cru PCLK_UART5>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 10>, <&dmac0 11>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart5m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1519,6 +1525,7 @@ uart6: serial@fe6a0000 {
clocks = <&cru SCLK_UART6>, <&cru PCLK_UART6>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 12>, <&dmac0 13>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart6m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1533,6 +1540,7 @@ uart7: serial@fe6b0000 {
clocks = <&cru SCLK_UART7>, <&cru PCLK_UART7>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 14>, <&dmac0 15>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart7m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1547,6 +1555,7 @@ uart8: serial@fe6c0000 {
clocks = <&cru SCLK_UART8>, <&cru PCLK_UART8>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 16>, <&dmac0 17>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart8m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
@@ -1561,6 +1570,7 @@ uart9: serial@fe6d0000 {
clocks = <&cru SCLK_UART9>, <&cru PCLK_UART9>;
clock-names = "baudclk", "apb_pclk";
dmas = <&dmac0 18>, <&dmac0 19>;
+ dma-names = "tx", "rx";
pinctrl-0 = <&uart9m0_xfer>;
pinctrl-names = "default";
reg-io-width = <4>;
--
2.56.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] arm64: dts: rockchip: Add dma-names to RK356x UART nodes
2026-10-08 15:36 [PATCH] arm64: dts: rockchip: Add dma-names to RK356x UART nodes Jun Yan
@ 2026-10-09 1:47 ` Jun Yan
0 siblings, 0 replies; 2+ messages in thread
From: Jun Yan @ 2026-10-09 1:47 UTC (permalink / raw)
To: jerrysteve1101
Cc: conor+dt, devicetree, heiko, krzk+dt, linux-arm-kernel,
linux-kernel, linux-rockchip, robh
> The RK356x UART nodes define a dmas property but omit the matching
> dma-names property, so the 8250 driver fails to request a DMA channel
> and falls back to PIO, logging:
>
> of_dma_request_slave_channel: dma-names property of node
> '/serial@fe650000' missing or empty
>
> Add the missing dma-names = "tx", "rx" to uart0 through uart9,
> matching other Rockchip SoCs such as the RK3308.
>
I realize that Fixes: tags should have been added for the dtsi-related fixes.
Apologies for the omission — I will include them in a v2.
> Signed-off-by: Jun Yan <jerrysteve1101@gmail.com>
> ---
> arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> index a5832895bd39..098493c04ecc 100644
> --- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> @@ -443,6 +443,7 @@ uart0: serial@fdd50000 {
> clocks = <&pmucru SCLK_UART0>, <&pmucru PCLK_UART0>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 0>, <&dmac0 1>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1449,6 +1450,7 @@ uart1: serial@fe650000 {
> clocks = <&cru SCLK_UART1>, <&cru PCLK_UART1>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 2>, <&dmac0 3>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart1m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1463,6 +1465,7 @@ uart2: serial@fe660000 {
> clocks = <&cru SCLK_UART2>, <&cru PCLK_UART2>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 4>, <&dmac0 5>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart2m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1477,6 +1480,7 @@ uart3: serial@fe670000 {
> clocks = <&cru SCLK_UART3>, <&cru PCLK_UART3>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 6>, <&dmac0 7>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart3m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1491,6 +1495,7 @@ uart4: serial@fe680000 {
> clocks = <&cru SCLK_UART4>, <&cru PCLK_UART4>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 8>, <&dmac0 9>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart4m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1505,6 +1510,7 @@ uart5: serial@fe690000 {
> clocks = <&cru SCLK_UART5>, <&cru PCLK_UART5>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 10>, <&dmac0 11>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart5m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1519,6 +1525,7 @@ uart6: serial@fe6a0000 {
> clocks = <&cru SCLK_UART6>, <&cru PCLK_UART6>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 12>, <&dmac0 13>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart6m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1533,6 +1540,7 @@ uart7: serial@fe6b0000 {
> clocks = <&cru SCLK_UART7>, <&cru PCLK_UART7>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 14>, <&dmac0 15>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart7m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1547,6 +1555,7 @@ uart8: serial@fe6c0000 {
> clocks = <&cru SCLK_UART8>, <&cru PCLK_UART8>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 16>, <&dmac0 17>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart8m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> @@ -1561,6 +1570,7 @@ uart9: serial@fe6d0000 {
> clocks = <&cru SCLK_UART9>, <&cru PCLK_UART9>;
> clock-names = "baudclk", "apb_pclk";
> dmas = <&dmac0 18>, <&dmac0 19>;
> + dma-names = "tx", "rx";
> pinctrl-0 = <&uart9m0_xfer>;
> pinctrl-names = "default";
> reg-io-width = <4>;
> --
> 2.56.0
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2026-10-08 15:36 [PATCH] arm64: dts: rockchip: Add dma-names to RK356x UART nodes Jun Yan
2026-10-09 1:47 ` Jun Yan
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