As stated in STM32MP2 Reference Manual [1], chapter "HPDMA allowed AXI
maximum length", "The maximum allowed AXI burst length is limited to 16.".

To apply this limitation on STM32MP25, add "st,axi-max-burst-len" property
in DMA controllers nodes in stm32mp251.dtsi.

[1] https://www.st.com/resource/en/reference_manual/rm0457-stm32mp2325xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
 arch/arm64/boot/dts/st/stm32mp251.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index 1167cf63d7e87aaa15c5c1ed70a9f6511fd818d4..443cc8d6ae8e9e2bff1bb862b0921d9626bb78e1 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -181,6 +181,7 @@ hpdma: dma-controller@40400000 {
 				     <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&scmi_clk CK_SCMI_HPDMA1>;
 			#dma-cells = <3>;
+			st,axi-max-burst-len = <16>;
 		};
 
 		hpdma2: dma-controller@40410000 {
@@ -204,6 +205,7 @@ hpdma2: dma-controller@40410000 {
 				     <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&scmi_clk CK_SCMI_HPDMA2>;
 			#dma-cells = <3>;
+			st,axi-max-burst-len = <16>;
 		};
 
 		hpdma3: dma-controller@40420000 {
@@ -227,6 +229,7 @@ hpdma3: dma-controller@40420000 {
 				     <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&scmi_clk CK_SCMI_HPDMA3>;
 			#dma-cells = <3>;
+			st,axi-max-burst-len = <16>;
 		};
 
 		rifsc: bus@42080000 {

-- 
2.25.1