On Fri, Jul 16, 2021 at 5:05 AM Peng Fan <peng.fan@xxxxxxx> wrote: > > Hi Daniel > > > Subject: [PATCH] arm64: dts: imx8mp: Add dsp node > > > > 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>; > > I think better mark this node as disabled. If its clock not enabled, > kernel may hang. Good point. Fixed in v2.
