linux-kernel - Re: [PATCH net-next v4 5/7] ARM64: dts: marvell: Fix some common switch mistakes

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Date:   Thu, 19 Oct 2023 17:49:35 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Marek Behún <kabel@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 5/7] ARM64: dts: marvell: Fix some common
 switch mistakes

On Thu, Oct 19, 2023 at 05:40:22PM +0300, Vladimir Oltean wrote:
> +Marek
> 
> On Wed, Oct 18, 2023 at 11:03:44AM +0200, Linus Walleij wrote:
> > Fix some errors in the Marvell MV88E6xxx switch descriptions:
> > - The top node had no address size or cells.
> > - switch0@0 is not OK, should be switch@0.
> > 
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> > diff --git a/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts b/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
> > index 9eab2bb22134..c69cb4e191e5 100644
> > --- a/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
> > +++ b/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
> > @@ -305,7 +305,7 @@ phy1: ethernet-phy@1 {
> >  	};
> >  
> >  	/* switch nodes are enabled by U-Boot if modules are present */
> > -	switch0@10 {
> > +	switch@10 {
> 
> As the comment says: U-Boot
> (https://elixir.bootlin.com/u-boot/latest/source/board/CZ.NIC/turris_mox/turris_mox.c#L728)
> sets up status = "okay" for these nodes depending on the MOXTET
> configuration. It doesn't look as if it's doing that by alias, just by
> path ("%s/switch%i@%x").
> 
> I have a Turris MOX, please allow me some time to test if the node name
> change is going to be significant and cause regressions. I expect the
> answer to be yes (sadly).

Yeah, it's bad.

U-Boot 2018.11 (Dec 16 2018 - 12:50:19 +0000), Build: jenkins-turris-os-packages-kittens-mox-90

DRAM:  1 GiB
Enabling Armada 3720 wComphy-0: SGMII1        3.125 Gbps
Comphy-1: PEX0          5 Gbps
Comphy-2: USB3_HOST0    5 Gbps
MMC:   sdhci@...00: 0
Loading Environment from SPI Flash... SF: Detected w25q64dw with page size 256 Bytes, erase size 4 KiB, total 8 MiB
OK
Model: CZ.NIC Turris Mox Board
Net:   eth0: neta@...00
Turris Mox:
  Board version: 22
  RAM size: 1024 MiB
  SD/eMMC version: SD
Module Topology:
   1: Peridot Switch Module (8-port)
   2: Peridot Switch Module (8-port)
   3: Peridot Switch Module (8-port)
   4: SFP Module

Hit any key to stop autoboot:  0
=> run sd_tftp_boot
neta@...00 Waiting for PHY auto negotiation to complete....... done
BOOTP broadcast 1
BOOTP broadcast 2
DHCP client bound to address 10.0.0.117 (254 ms)
Using neta@...00 device
TFTP from server 10.0.0.1; our IP address is 10.0.0.117
Filename 'mox/armada-3720-turris-mox.dtb'.
Load address: 0x4f00000
Loading: ####
         1.5 MiB/s
done
Bytes transferred = 19479 (4c17 hex)
Using neta@...00 device
TFTP from server 10.0.0.1; our IP address is 10.0.0.117
Filename 'mox/Image'.
Load address: 0x5000000
Loading: #################################################################
         ##########################################
         6 MiB/s
done
Bytes transferred = 54069760 (3390a00 hex)
## Flattened Device Tree blob at 04f00000
   Booting using the fdt blob at 0x4f00000
   Loading Device Tree to 000000003bf16000, end 000000003bf1dc16 ... OK
ERROR: board-specific fdt fixup failed: FDT_ERR_NOTFOUND
 - must RESET the board to recover.

FDT creation failed! hanging...### ERROR ### Please RESET the board ###