linux-kernel - [PATCH v1 3/3] arm64: dts: colibri-imx8x: Add cma memory

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Message-ID: <20251031125003.275033-4-max.oss.09@gmail.com>
Date: Fri, 31 Oct 2025 13:49:43 +0100
From: max.oss.09@...il.com
To: Max Krummenacher <max.krummenacher@...adex.com>
Cc: Philippe Schenker <philippe.schenker@...adex.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 3/3] arm64: dts: colibri-imx8x: Add cma memory

From: Philippe Schenker <philippe.schenker@...adex.com>

Add CMA in device tree and set its size to 416MiB for all
Colibri iMX8X.
The size is tuned to be enough to play full HD video using gst-play
and to fit in the SKU with the lowest amount of RAM (1GB).

Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>

---

 arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi b/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
index 32bca4c6f37e..d4bf30d91d69 100644
--- a/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi
@@ -86,6 +86,19 @@ reg_usbh_vbus: regulator-usbh-vbus {
 		regulator-name = "usbh_vbus";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		linux,cma {
+			compatible = "shared-dma-pool";
+			linux,cma-default;
+			reusable;
+			size = <0 0x1a000000>;
+		};
+	};
+
 	sound-card {
 		compatible = "simple-audio-card";
 		simple-audio-card,bitclock-master = <&dailink_master>;
-- 
2.42.0