netdev - Re: [PATCH v2 4/4] net: dsa: vsc73xx: Assert reset if iCPU is enabled

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Date:   Thu, 4 Jul 2019 23:57:19 +0200
From:   Paweł Dembicki <paweldembicki@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] net: dsa: vsc73xx: Assert reset if iCPU is enabled

On 4/7/19 09:22 Linus Walleij <linus.walleij@...aro.org> wrote:
>
> My devices do not have direct access to the reset line so I
> can't assert reset no matter how I try, if it works for you, the
> code is certainly better like this.
>

In P2020RDB, VSC7385 reset is connected to GPIO. U-boot put binary
file to iCPU and make VSC7385 unmanaged.
However reset flush internal memory and iCPU stop.
In this case bootlog looks like that:

[    2.989047] vsc73xx-platform ffb00000.switch: VSC7385 (rev: 2) switch found
[    2.996192] vsc73xx-platform ffb00000.switch: iCPU enabled boots
from PI/SI, no external memory
[    3.005057] vsc73xx-platform ffb00000.switch: Chip seems to be out
of control. Assert reset and try again.
[    3.045034] vsc73xx-platform ffb00000.switch: VSC7385 (rev: 2) switch found
[    3.052171] vsc73xx-platform ffb00000.switch: iCPU disabled, no
external memory

Best Regards,
Pawel Dembicki