[PATCH 12/12] ARM: dts: stm32: enable DCMI DMA-MDMA chaining on stm32mp157c-ev1.dts

Alain Volmat
2025-12-18T18:45:30Z

Enable the DMA-MDMA chaining for the dcmi (camera capture)
in order to be able to achieve higher resolution.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
arch/arm/boot/dts/st/stm32mp157c-ev1.dts | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
index 8f99c30f1af1..68b536b0c6ee 100644
--- a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
+++ b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
@@ -86,6 +86,14 @@ &dcmi {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&dcmi_pins_a>;
pinctrl-1 = <&dcmi_sleep_pins_a>;
+ /*
+ * Enable DMA-MDMA chaining by adding a SRAM pool and
+ * a MDMA channel
+ */
+ sram = <&dcmi_pool>;
+
+ dmas = <&dmamux1 75 0x400 0x01>, <&mdma1 0 0x3 0x1200000a 0 0>;
+ dma-names = "tx", "mdma_tx";

port {
dcmi_0: endpoint {
@@ -301,6 +309,13 @@ &spi1 {
status = "disabled";
};

+&sram4 {
+ dcmi_pool: dcmi-sram@0 {
+ reg = <0x0 0x8000>;
+ pool;
+ };
+};
+
&timers2 {
/* spare dmas for other usage (un-delete to enable pwm capture) */
/delete-property/dmas;

--
2.34.1