From: Johan Hovold <johan@kernel.org>
To: Tim Harvey <tharvey@gateworks.com>
Cc: Johan Hovold <johan@kernel.org>,
linux-spi@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: Linux gnss driver SPI support?
Date: Thu, 7 Jan 2021 10:03:49 +0100 [thread overview]
Message-ID: <X/bOdQMe80v4N3AF@hovoldconsulting.com> (raw)
In-Reply-To: <CAJ+vNU3WyXT5ozp1mc2EnxHrPGxzEGy8Tt1sNVLV+5WSfeAA+w@mail.gmail.com>
On Wed, Jan 06, 2021 at 12:17:01PM -0800, Tim Harvey wrote:
> On Wed, Jan 6, 2021 at 3:21 AM Johan Hovold <johan@kernel.org> wrote:
> > Correct, there are currently no drivers supporting SPI and hence no
> > shared implementation either like there is for UART interfaces.
> >
> > The driver for your device would need to handle the SPI bits itself for
> > now. What kind of device is it?
> It is the u-blox ZOE-M8Q which has a UART as well as SPI/I2C/SQI
> interface. The particular board design we are working on is
> unfortunately out of UART's which is why we were looking at connecting
> it via SPI.
So we'd need to add support for the SPI interface to the ublox driver,
which is currently UART only.
> I did come across a posting about this [1] which uses a userspace app
> that creates a spy to pty bridge but it seems like they ran into some
> performance/latency issues.
Yeah, that is one of the problems that the gnss subsystem is meant to
solve; to handle the transport interface in the kernel and provide a
generic interface to user space.
Johan
prev parent reply other threads:[~2021-01-07 9:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-05 18:23 Linux gnss driver SPI support? Tim Harvey
2021-01-06 11:21 ` Johan Hovold
2021-01-06 20:17 ` Tim Harvey
2021-01-07 9:03 ` Johan Hovold [this message]
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