linux-kernel - Re: [PATCH v3 5/6] dt-bindings: net: dsa: make reset optional and add rgmii-mode to mt7531

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Message-ID: <DC0D3996-DFFE-4E71-B843-8D34C613D498@public-files.de>
Date:   Sun, 08 May 2022 08:24:37 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     linux-rockchip@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org
CC:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Peter Geis <pgwipeout@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Greg Ungerer <gerg@...nel.org>,
        René van Dorst <opensource@...rst.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: [PATCH v3 5/6] dt-bindings: net: dsa: make reset optional and add rgmii-mode to mt7531

Am 7. Mai 2022 22:01:22 MESZ schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:
>On 07/05/2022 19:04, Frank Wunderlich wrote:
>> From: Frank Wunderlich <frank-w@...lic-files.de>
>> 
>> Make reset optional as driver already supports it, 
>
>I do not see the connection between hardware needing or not needing a
>reset GPIO and a driver supporting it or not... What does it mean?

My board has a shared gpio-reset between gmac and switch, so both will resetted if it is asserted. Currently it is set to the gmac and is aquired exclusive. Adding it to switch results in 2 problems:

- due to exclusive and already mapped to gmac, switch driver exits as it cannot get the reset-gpio again.
- if i drop the reset from gmac and add to switch, it resets the gmac and this takes too long for switch to get up. Of course i can increase the wait time after reset,but dropping reset here was the easier way.

Using reset only on gmac side brings the switch up.

>> allow port 5 as
>> cpu-port 
>
>How do you allow it here?

Argh, seems i accidentally removed this part and have not recognized while checking :(

It should only change description of reg for ports to:

"Port address described must be 5 or 6 for CPU port and from 0 to 5 for user ports."

regards Frank