Re: [PATCH] arm64: dts: ti: phycore-am64: Add R5F DMA Region and Mailboxes

[Wadim Egorov <w.egorov@xxxxxxxxx>]

Hi Nishanth,

Am 03.11.23 um 01:17 schrieb Nishanth Menon:
> On 13:12-20231102, Garrett Giordano wrote:
> > Communication between the R5F subsystem and Linux takes place using DMA
> > memory regions and mailboxes. Here we add DT nodes for the memory
> > regions and mailboxes to facilitate communication between the R5
> > clusters and Linux as remoteproc will fail to start if no memory
> > regions or mailboxes are provided.
> >
> > Fixes: c48ac0efe6d7 ("arm64: dts: ti: Add support for phyBOARD-Electra-AM642")
> is this fixes? Sounds more or less like rproc support is added in?

I would say it is also a fix, as the R5 cores are enabled by default at 
the SoC level devicetree and also require mboxes & memory regions to be 
configured. The docs mention both as mandatory.

Otherwise, we will encounter errors such as

  platform 78000000.r5f: device does not have reserved memory regions, 
ret = -22

Regards,
Wadim

> > Signed-off-by: Garrett Giordano <ggiordano@xxxxxxxxxx>
> > ---
> >   .../boot/dts/ti/k3-am64-phycore-som.dtsi      | 102 +++++++++++++++++-
> >   1 file changed, 101 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> > index 1c2c8f0daca9..37a33006c1fc 100644
> > --- a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> > @@ -29,7 +29,7 @@ memory@80000000 {
> >   		reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
> >   	};
> >   
> > -	reserved-memory {
> > +	reserved_memory: reserved-memory {
> >   		#address-cells = <2>;
> >   		#size-cells = <2>;
> >   		ranges;
> > @@ -39,6 +39,54 @@ secure_ddr: optee@9e800000 {
> >   			alignment = <0x1000>;
> >   			no-map;
> >   		};
> > +
> > +		main_r5fss0_core0_dma_memory_region: r5f-dma-memory@a0000000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa0000000 0x00 0x100000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss0_core0_memory_region: r5f-memory@a0100000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa0100000 0x00 0xf00000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss0_core1_dma_memory_region: r5f-dma-memory@a1000000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa1000000 0x00 0x100000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss0_core1_memory_region: r5f-memory@a1100000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa1100000 0x00 0xf00000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss1_core0_dma_memory_region: r5f-dma-memory@a2000000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa2000000 0x00 0x100000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss1_core0_memory_region: r5f-memory@a2100000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa2100000 0x00 0xf00000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss1_core1_dma_memory_region: r5f-dma-memory@a3000000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa3000000 0x00 0x100000>;
> > +			no-map;
> > +		};
> > +
> > +		main_r5fss1_core1_memory_region: r5f-memory@a3100000 {
> > +			compatible = "shared-dma-pool";
> > +			reg = <0x00 0xa3100000 0x00 0xf00000>;
> > +			no-map;
> > +		};
> >   	};
> >   
> >   	leds {
> > @@ -160,6 +208,34 @@ &cpsw_port2 {
> >   	status = "disabled";
> >   };
> >   
> > +&mailbox0_cluster2 {
> > +	status = "okay";
> > +
> > +	mbox_main_r5fss0_core0: mbox-main-r5fss0-core0 {
> > +		ti,mbox-rx = <0 0 2>;
> > +		ti,mbox-tx = <1 0 2>;
> > +	};
> > +
> > +	mbox_main_r5fss0_core1: mbox-main-r5fss0-core1 {
> > +		ti,mbox-rx = <2 0 2>;
> > +		ti,mbox-tx = <3 0 2>;
> > +	};
> > +};
> > +
> > +&mailbox0_cluster4 {
> > +	status = "okay";
> > +
> > +	mbox_main_r5fss1_core0: mbox-main-r5fss1-core0 {
> > +		ti,mbox-rx = <0 0 2>;
> > +		ti,mbox-tx = <1 0 2>;
> > +	};
> > +
> > +	mbox_main_r5fss1_core1: mbox-main-r5fss1-core1 {
> > +		ti,mbox-rx = <2 0 2>;
> > +		ti,mbox-tx = <3 0 2>;
> > +	};
> > +};
> > +
> >   &main_i2c0 {
> >   	status = "okay";
> >   	pinctrl-names = "default";
> > @@ -180,6 +256,30 @@ i2c_som_rtc: rtc@52 {
> >   	};
> >   };
> >   
> > +&main_r5fss0_core0 {
> > +	mboxes = <&mailbox0_cluster2 &mbox_main_r5fss0_core0>;
> > +	memory-region = <&main_r5fss0_core0_dma_memory_region>,
> > +			<&main_r5fss0_core0_memory_region>;
> > +};
> > +
> > +&main_r5fss0_core1 {
> > +	mboxes = <&mailbox0_cluster2 &mbox_main_r5fss0_core1>;
> > +	memory-region = <&main_r5fss0_core1_dma_memory_region>,
> > +			<&main_r5fss0_core1_memory_region>;
> > +};
> > +
> > +&main_r5fss1_core0 {
> > +	mboxes = <&mailbox0_cluster4 &mbox_main_r5fss1_core0>;
> > +	memory-region = <&main_r5fss1_core0_dma_memory_region>,
> > +			<&main_r5fss1_core0_memory_region>;
> > +};
> > +
> > +&main_r5fss1_core1 {
> > +	mboxes = <&mailbox0_cluster4 &mbox_main_r5fss1_core1>;
> > +	memory-region = <&main_r5fss1_core1_dma_memory_region>,
> > +			<&main_r5fss1_core1_memory_region>;
> > +};
> > +
> >   &ospi0 {
> >   	status = "okay";
> >   	pinctrl-names = "default";
> > --
> > 2.25.1