linux-kernel - Re: [PATCH v10 4/6] serial: sc16is7xx: fix regression with GPIO configuration

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Date:   Thu, 17 Aug 2023 13:01:35 -0500
From:   Rob Herring <robh@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     gregkh@...uxfoundation.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, jirislaby@...nel.org, jringle@...dpoint.com,
        tomasz.mon@...lingroup.com, l.perczak@...lintechnologies.com,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        stable@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Lech Perczak <lech.perczak@...lingroup.com>
Subject: Re: [PATCH v10 4/6] serial: sc16is7xx: fix regression with GPIO
 configuration

On Mon, Aug 07, 2023 at 05:45:54PM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> Commit 679875d1d880 ("sc16is7xx: Separate GPIOs from modem control lines")
> and commit 21144bab4f11 ("sc16is7xx: Handle modem status lines")
> changed the function of the GPIOs pins to act as modem control
> lines without any possibility of selecting GPIO function.
> 
> As a consequence, applications that depends on GPIO lines configured
> by default as GPIO pins no longer work as expected.
> 
> Also, the change to select modem control lines function was done only
> for channel A of dual UART variants (752/762). This was not documented
> in the log message.
> 
> Allow to specify GPIO or modem control line function in the device
> tree, and for each of the ports (A or B).
> 
> Do so by using the new device-tree property named
> "nxp,modem-control-line-ports" (property added in separate patch).
> 
> When registering GPIO chip controller, mask-out GPIO pins declared as
> modem control lines according to this new DT property.
> 
> Fixes: 679875d1d880 ("sc16is7xx: Separate GPIOs from modem control lines")
> Fixes: 21144bab4f11 ("sc16is7xx: Handle modem status lines")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Reviewed-by: Lech Perczak <lech.perczak@...lingroup.com>
> Tested-by: Lech Perczak <lech.perczak@...lingroup.com>
> ---
>  drivers/tty/serial/sc16is7xx.c | 143 +++++++++++++++++++++++++--------
>  1 file changed, 108 insertions(+), 35 deletions(-)

Acked-by: Rob Herring <robh@...nel.org>