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

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Message-ID: <20251218-stm32-dcmi-dma-chaining-v1-12-39948ca6cbf6@foss.st.com>
Date: Thu, 18 Dec 2025 19:44:52 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hugues Fruchet <hugues.fruchet@...s.st.com>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre
 Torgue" <alexandre.torgue@...s.st.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König
	<christian.koenig@....com>
CC: <linux-media@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>,
        Alain Volmat <alain.volmat@...s.st.com>
Subject: [PATCH 12/12] 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@...s.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