linux-kernel - Re: [PATCH 1/2] ARM: dts: kirkwood: lsxl: fix serial line

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Date:   Fri, 19 Aug 2022 02:28:34 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     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>,
        Jason Cooper <jason@...edaemon.net>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: dts: kirkwood: lsxl: fix serial line

On Tue, Aug 16, 2022 at 02:10:24AM +0200, Michael Walle wrote:
> Commit 327e15428977 ("ARM: dts: kirkwood: consolidate common pinctrl
> settings") unknowingly broke the serial output on this board. Before
> this commit, the pinmux was still configured by the bootloader and the
> kernel didn't reconfigured it again. This was an oversight by the
> initial board support where the pinmux for the serial line was never
> configured by the kernel. But with this commit, the serial line will be
> reconfigured to the wrong pins. This is especially confusing, because
> the output still works, but the input doesn't. Presumingly, the input is
> reconfigured to MPP10, but the output is connected to both MPP11 and
> MPP5.
> 
> Override the pinmux in the board device tree.
> 
> Fixes: 327e15428977 ("ARM: dts: kirkwood: consolidate common pinctrl settings")
> Signed-off-by: Michael Walle <michael@...le.cc>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew