[PATCH v2 12/13] arm64: dts: mediatek: mt8186-corsola: Reserve memory for audio frontend

[Chen-Yu Tsai]

Some MediaTek platforms already reserve a small block of memory for the
audio frontend. These platforms reserve it at a fixed address, though it
is unclear if that is due to hardware access restrictions or simply
compacting the reserved memory blocks together.

Reserve the same size of memory on the MT8186 Corsola family as well, to
align with the other MediaTek-based ChromeOS platforms. This also helps
with memory starvation as these devices sometimes end up in low memory
conditions.

Signed-off-by: Chen-Yu Tsai <wenst at chromium.org>
---
 arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
index c864ed495702..b139588ae246 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
@@ -161,6 +161,13 @@ reserved_memory: reserved-memory {
 		#size-cells = <2>;
 		ranges;
 
+		afe_dma_mem: audio-dma-pool {
+			compatible = "shared-dma-pool";
+			size = <0 0x100000>;
+			alignment = <0 0x10>;
+			no-map;
+		};
+
 		adsp_dma_mem: memory at 61000000 {
 			compatible = "shared-dma-pool";
 			reg = <0 0x61000000 0 0x100000>;
@@ -310,6 +317,7 @@ &adsp {
 };
 
 &afe {
+	memory-region = <&afe_dma_mem>;
 	status = "okay";
 };
 
-- 
2.49.0.805.g082f7c87e0-goog