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    SubjectRe: [PATCH V3 1/3] gpio: Add virtio-gpio driver
    On Wed 16 Jun 10:52 CDT 2021, Enrico Weigelt, metux IT consult wrote:

    > On 16.06.21 05:30, Bjorn Andersson wrote:
    >
    > > Combined with the virtio-i2c effort this could provide an alternative by
    > > simply tunneling the busses and GPIOs into Linux and use standard iio
    > > drivers, for cases where this suits your product requirements better.
    >
    > So, you wanna use virtio as logical interface between the two CPUs ?
    > Interesting idea. Usually folks use rpmsg for those things.
    >

    rpmsg is a layer on top of virtio, so this would be an extension of the
    existing model.

    There's been discussions (and I believe some implementations) related to
    bridging I2C requests over rpmsg, but I think it's preferable to
    standardize around the virtio based bearer directly.

    > What is running on the secondary CPU ? Some OS like Linux or some bare
    > metal stuff ? What kind of CPU is that anyways ?
    >

    These ideas revolves around platforms that implements something like the
    "Android Sensor Hub", which provides some resource constraint
    co-processor that deals with sensor device interaction and processing of
    the data without waking up the power-hungry ARM cores.

    Given the focus on power consumption I would guess that these are not
    going to run Linux. Core-wise I've seen this implemented using primarily
    ARM and Hexagon cores.

    Regards,
    Bjorn

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