ARM: dts: stm32: enable DCMI DMA-MDMA chaining on stm32mp157c-ev1.dts

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>
Link: https://lore.kernel.org/r/20260106-stm32-dcmi-dma-chaining-v2-12-70688bccd80a@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

diff --git a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
index 4e46d58bf61f4b02e6eb5b1fa3a2d0d3df10e018..99c7efd73aeeae7be02ea9677da603ecbe2a4e1f 100644 (file)
--- a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
+++ b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
@@ -86,6 +86,14 @@
        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 {
@@ -302,6 +310,13 @@
        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;