linux-kernel - Re: [net-next PATCH v5 13/15] arm: qcom: dt: Add Switch LED for each port for rb3011

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Message-ID: <ZBw/SbstO5oU6osW@duo.ucw.cz>
Date:   Thu, 23 Mar 2023 13:00:09 +0100
From:   Pavel Machek <pavel@....cz>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Lee Jones <lee@...nel.org>, John Crispin <john@...ozen.org>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-leds@...r.kernel.org,
        Jonathan McDowell <noodles@...th.li>
Subject: Re: [net-next PATCH v5 13/15] arm: qcom: dt: Add Switch LED for each
 port for rb3011

On Sun 2023-03-19 20:18:12, Christian Marangi wrote:
> Add Switch LED for each port for MikroTik RB3011UiAS-RM.
> 
> MikroTik RB3011UiAS-RM is a 10 port device with 2 qca8337 switch chips
> connected.
> 
> It was discovered that in the hardware design all 3 Switch LED trace of
> the related port is connected to the same LED. This was discovered by
> setting to 'always on' the related led in the switch regs and noticing
> that all 3 LED for the specific port (for example for port 1) cause the
> connected LED for port 1 to turn on. As an extra test we tried enabling
> 2 different LED for the port resulting in the LED turned off only if
> every led in the reg was off.
> 
> Aside from this funny and strange hardware implementation, the device
> itself have one green LED for each port, resulting in 10 green LED one
> for each of the 10 supported port.
> 
> Cc: Jonathan McDowell <noodles@...th.li>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

Reviewed-by: Pavel Machek <pavel@....cz>

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