From: Eric Anholt <eric@anholt.net>
To: Phil Elwell <phil@raspberrypi.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Stefan Wahren <stefan.wahren@i2se.com>,
linux-serial@vger.kernel.org,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] serial: 8250: Add CAP_MINI, set for bcm2835aux
Date: Fri, 19 May 2017 11:09:54 -0700 [thread overview]
Message-ID: <87vaowg1l9.fsf@eliezer.anholt.net> (raw)
In-Reply-To: <8d9c605a-bff7-607c-2c5b-4ec75e68ac2d@raspberrypi.org>
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Phil Elwell <phil@raspberrypi.org> writes:
> The AUX/mini-UART in the BCM2835 family of procesors is a cut-down
> 8250 clone. In particular it is lacking support for the following
> features: CSTOPB PARENB PARODD CMSPAR CS5 CS6
>
> Add a new capability (UART_CAP_MINI) that exposes the restrictions to
> the user of the termios API by turning off the unsupported features in
> the request.
>
> N.B. It is almost possible to automatically discover the missing
> features by reading back the LCR register, but the CSIZE bits don't
> cooperate (contrary to the documentation, both bits are significant,
> but CS5 and CS6 are mapped to CS7) and the code is much longer.
>
> See: https://github.com/raspberrypi/linux/issues/1561
>
> Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Acked-by: Eric Anholt <eric@anholt.net>
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prev parent reply other threads:[~2017-05-19 18:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-19 15:07 [PATCH] serial: 8250: Add CAP_MINI, set for bcm2835aux Phil Elwell
2017-05-19 18:09 ` Eric Anholt [this message]
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