[PATCH v2 13/15] arm64: dts: imx8mm-phycore-som: Add overlay for rproc

[Andrej Picej]

Hi Shawn,

On 30. 12. 24 05:17, Shawn Guo wrote:
> On Mon, Dec 02, 2024 at 08:20:50AM +0100, Andrej Picej wrote:
>> From: Dominik Haller <d.haller at phytec.de>
>>
>> Adds a devicetree overlay containing reserved memory regions used
>> for intercore communication between A53 and M4 cores.
>>
>> Signed-off-by: Dominik Haller <d.haller at phytec.de>
>> Signed-off-by: Andrej Picej <andrej.picej at norik.com>
>> ---
>> Changes in v2:
>>   - no change.
>> ---
>>   arch/arm64/boot/dts/freescale/Makefile        |  2 +
>>   .../dts/freescale/imx8mm-phycore-rpmsg.dtso   | 55 +++++++++++++++++++
>>   2 files changed, 57 insertions(+)
>>   create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso
>>
>> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
>> index 99be36a04db9..5bc083a7b778 100644
>> --- a/arch/arm64/boot/dts/freescale/Makefile
>> +++ b/arch/arm64/boot/dts/freescale/Makefile
>> @@ -125,9 +125,11 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-phyboard-polis-rdk.dtb
>>   
>>   imx8mm-phyboard-polis-peb-av-10-dtbs += imx8mm-phyboard-polis-rdk.dtb imx8mm-phyboard-polis-peb-av-10.dtbo
>>   imx8mm-phyboard-polis-peb-eval-01-dtbs += imx8mm-phyboard-polis-rdk.dtb imx8mm-phyboard-polis-peb-eval-01.dtbo
>> +imx8mm-phycore-rpmsg-dtbs += imx8mm-phyboard-polis-rdk.dtb imx8mm-phycore-rpmsg.dtbo
>>   
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mm-phyboard-polis-peb-av-10.dtb
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mm-phyboard-polis-peb-eval-01.dtb
>> +dtb-$(CONFIG_ARCH_MXC) += imx8mm-phycore-rpmsg.dtb
>>   
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mm-phygate-tauri-l.dtb
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mm-prt8mm.dtb
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso b/arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso
>> new file mode 100644
>> index 000000000000..0c61946f0cf8
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso
>> @@ -0,0 +1,55 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2024 PHYTEC Messtechnik GmbH
>> + * Author: Dominik Haller <d.haller at phytec.de>
>> + */
>> +
>> +/dts-v1/;
>> +/plugin/;
>> +
>> +#include <dt-bindings/clock/imx8mm-clock.h>
>> +
>> +&{/} {
>> +	reserved-memory {
>> +		#address-cells = <2>;
>> +		#size-cells = <2>;
>> +		ranges;
> 
> I'm getting this:
> 
> arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso:16.3-10: Warning (ranges_format): /fragment at 0/__overlay__/reserved-memory:ranges: empty "ranges" property but its #size-cells (2) differs from /fragment at 0/__overlay__ (1)
> arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso:13.18-43.4: Warning (avoid_default_addr_size): /fragment at 0/__overlay__/reserved-memory: Relying on default #address-cells value
> arch/arm64/boot/dts/freescale/imx8mm-phycore-rpmsg.dtso:13.18-43.4: Warning (avoid_default_addr_size): /fragment at 0/__overlay__/reserved-memory: Relying on default #size-cells value
> 

I see, missed this before, sorry. But I have some problems fixing it.
I think the problem is that this is overlay, the same node put in the 
imx8mm-phycore-som.dtsi doesn't trigger a warning.
The only solution that I found is that I specify the default 
address-cells and size-cells in root node:


&{/} {
	#address-cells = <2>;
	#size-cells = <2>;

	reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;
	...
	};
};

The same values are used in imx8mm.dtsi, but the checker fails to find 
these default values.
Not sure if this is the right solution, though. Your input would be 
helpful, thanks.

Best regards,
Andrej


> Shawn
> 
>> +
>> +		m4_reserved: m4 at 80000000 {
>> +			reg = <0 0x80000000 0 0x1000000>;
>> +			no-map;
>> +		};
>> +
>> +		vdev0vring0: vdev0vring0 at b8000000 {
>> +			reg = <0 0xb8000000 0 0x8000>;
>> +			no-map;
>> +		};
>> +
>> +		vdev0vring1: vdev0vring1 at b8008000 {
>> +			reg = <0 0xb8008000 0 0x8000>;
>> +			no-map;
>> +		};
>> +
>> +		rsc_table: rsc_table at b80ff000 {
>> +			reg = <0 0xb80ff000 0 0x1000>;
>> +			no-map;
>> +		};
>> +
>> +		vdevbuffer: vdevbuffer at b8400000 {
>> +			compatible = "shared-dma-pool";
>> +			reg = <0 0xb8400000 0 0x100000>;
>> +			no-map;
>> +		};
>> +	};
>> +
>> +	core-m4 {
>> +		compatible = "fsl,imx8mm-cm4";
>> +		clocks = <&clk IMX8MM_CLK_M4_DIV>;
>> +		mboxes = <&mu 0 1
>> +			&mu 1 1
>> +			&mu 3 1>;
>> +		mbox-names = "tx", "rx", "rxdb";
>> +		memory-region = <&vdevbuffer>, <&vdev0vring0>, <&vdev0vring1>, <&rsc_table>;
>> +		syscon = <&src>;
>> +	};
>> +};
>> -- 
>> 2.34.1
>>
>