[PATCH] arm64: dts: imx8mp: Add dsp node

From: Daniel Baluta
Date: Thu Jul 15 2021 - 07:59:17 EST


From: Daniel Baluta <daniel.baluta@xxxxxxx>

i.MX8 MPlus SoC integrates Cadence HIFI4 DSP. This core runs either a
custom firmware or the open source SOF firmware [1]

DSP device is handled by SOF OF driver found in
sound/soc/sof/sof-of-dev.c

Notice that the DSP node makes use of:
- dsp_reserved, a reserved memory region for various Audio
resources (e.g firmware loading, audio buffers, etc).
- Messaging Unit (mu2) for passing notifications betweem ARM
core and DSP.

[1] https://thesofproject.github.io/latest/platforms/index.html
Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
---
arch/arm64/boot/dts/freescale/imx8mp.dtsi | 28 +++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index 9f7c7f587d38..264ba540f363 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -135,6 +135,17 @@ clk_ext4: clock-ext4 {
clock-output-names = "clk_ext4";
};

+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ dsp_reserved: dsp@92400000 {
+ reg = <0 0x92400000 0 0x2000000>;
+ no-map;
+ };
+ };
+
pmu {
compatible = "arm,cortex-a53-pmu";
interrupts = <GIC_PPI 7
@@ -698,6 +709,13 @@ mu: mailbox@30aa0000 {
#mbox-cells = <2>;
};

+ mu2: mailbox@30e60000 {
+ compatible = "fsl,imx8mp-mu", "fsl,imx6sx-mu";
+ reg = <0x30e60000 0x10000>;
+ interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
+ #mbox-cells = <2>;
+ };
+
i2c5: i2c@30ad0000 {
compatible = "fsl,imx8mp-i2c", "fsl,imx21-i2c";
#address-cells = <1>;
@@ -938,5 +956,15 @@ usb_dwc3_1: usb@38200000 {
snps,dis-u2-freeclk-exists-quirk;
};
};
+ dsp: dsp@3b6e8000 {
+ compatible = "fsl,imx8mp-dsp";
+ reg = <0x3b6e8000 0x88000>;
+ mbox-names = "txdb0", "txdb1",
+ "rxdb0", "rxdb1";
+ mboxes = <&mu2 2 0>, <&mu2 2 1>,
+ <&mu2 3 0>, <&mu2 3 1>;
+ memory-region = <&dsp_reserved>;
+ status = "disabled";
+ };
};
};
--
2.27.0