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    SubjectRe: [linux-sunxi] Re: [PATCH v3 2/3] dt-bindings: input: Add R_LRADC support for A83T
    On 27/06/2017 at 19:36:31 +0200, Maxime Ripard wrote:
    > Hi,
    >
    > On Tue, Jun 27, 2017 at 11:29:10PM +0800, icenowy@aosc.io wrote:
    > > Maxime, here's another problem: if we have already a GP LRADC driver,
    > > how can we tell the kernel to use it as IIO ADC rather than keys?
    >
    > The GPADC IIO driver is not for the LRADC driver, but the GPADC /
    > temperature sensor.
    >
    > We used to have an LRADC IIO driver in the CHIP BSP written by Alex
    > (in CC):
    > https://github.com/NextThingCo/CHIP-linux/commit/8675b761c54be73dc7cc0113209f02e10cc63a27
    >
    > But he never mainlined it.
    >
    > > Should we introduce a new property for this once ready?
    >
    > We need to keep the current binding. We can just check for the
    > presence or not of child nodes to see if it has some keys, and we'd
    > need an IIO-to-input driver that is yet to be written.
    >

    The whole submission is here and can already replace the existing driver
    but it will be polling instead of using interrupts:

    http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/440734.html

    It is not upstream because it seems the full replacement was required at
    once instead of doing it incrementally and there was (is) no API for
    in-kernel events consumers.

    Also, the DT ABI stuff would have to be solved.

    --
    Alexandre Belloni, Free Electrons
    Embedded Linux and Kernel engineering
    http://free-electrons.com

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