linux-kernel - Re: [PATCH 3/4] ARM: dts: BCM5301X: Add DT for ASUS RT-AC3200

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Message-ID: <335cdd4b-7309-4633-9b4f-6487c72c395c@arinc9.com>
Date: Sun, 14 Apr 2024 23:21:02 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Florian Fainelli <f.fainelli@...il.com>,
 Hauke Mehrtens <hauke@...ke-m.de>, Rafal Milecki <zajec5@...il.com>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: Tom Brautaset <tbrautaset@...il.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/4] ARM: dts: BCM5301X: Add DT for ASUS RT-AC3200

On 14.04.2024 22:12, Krzysztof Kozlowski wrote:
> On 14/04/2024 18:59, Arınç ÜNAL wrote:
>>>> +	};
>>>> +
>>>> +	memory@0 {
>>>> +		device_type = "memory";
>>>> +		reg = <0x00000000 0x08000000>,
>>>> +		      <0x88000000 0x08000000>;
>>>> +	};
>>>> +
>>>> +	nvram@...80000 {
>>>> +		compatible = "brcm,nvram";
>>>> +		reg = <0x1c080000 0x00180000>;
>>>
>>> Why is this outside of soc? Both soc node and soc DTSI?
>>
>> I don't maintain the SoC device tree files so I don't know. The nvram node
>> doesn't exist on any of the device tree files included by this device tree.
> 
> There are two problems here:
> 1. This looks like SoC component and such should not be in board DTS.
> Regardless whether you maintain something or not, you should not add
> incorrect code. Unless this is correct code, but then please share some
> details.

NVRAM is described as both flash device partition and memory mapped NVMEM.
This platform stores NVRAM on flash but makes it also memory accessible.

As device partitions are described in board DTS, the nvram node must also
be defined there as its address and size will be different by board. It has
been widely described on at least bcm4709 and bcm47094 SoC board DTS files
here.

> 
> 2. You cannot have MMIO node outside of soc. That's a W=1 warning.

I was not able to spot a warning related to this with the command below.
The source code directory is checked out on a recent soc/soc.git for-next
tree. Please let me know the correct command to do this.

$ make W=1 dtbs
[...]
   DTC     arch/arm/boot/dts/broadcom/bcm4709-asus-rt-ac3200.dtb
arch/arm/boot/dts/broadcom/bcm5301x-nand-cs0.dtsi:10.18-19.5: Warning (avoid_unnecessary_addr_size): /nand-controller@...28000/nand@0: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property
   also defined at arch/arm/boot/dts/broadcom/bcm5301x-nand-cs0-bch8.dtsi:13.9-17.3
   also defined at arch/arm/boot/dts/broadcom/bcm4709-asus-rt-ac3200.dts:137.9-160.3
arch/arm/boot/dts/broadcom/bcm-ns.dtsi:24.28-47.4: Warning (unique_unit_address_if_enabled): /chipcommon-a-bus@...00000: duplicate unit-address (also used in node /axi@...00000)
arch/arm/boot/dts/broadcom/bcm-ns.dtsi:323.22-328.4: Warning (unique_unit_address_if_enabled): /mdio@...03000: duplicate unit-address (also used in node /mdio-mux@...03000)

Arınç