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    SubjectRe: [PATCH 1/9] pinctrl: sunxi: Support I/O bias voltage setting on A80
    On Mon, Feb 11, 2019 at 4:21 PM Linus Walleij <linus.walleij@linaro.org> wrote:
    >
    > On Wed, Feb 6, 2019 at 4:32 AM Chen-Yu Tsai <wens@csie.org> wrote:
    >
    > > The A80 SoC has configuration registers for I/O bias voltage. Incorrect
    > > settings would make the affected peripherals inoperable in some cases,
    > > such as Ethernet RGMII signals biased at 2.5V with the settings still
    > > at 3.3V. However low speed signals such as MDIO on the same group of
    > > pins seem to be unaffected.
    > >
    > > Previously there was no way to know what the actual voltage used was,
    > > short of hard-coding a value in the device tree. With the new pin bank
    > > regulator supply support in place, the driver can now query the
    > > regulator for its voltage, and if it's valid (as opposed to being the
    > > dummy regulator), set the bias voltage setting accordingly.
    > >
    > > Add a quirk to denote the presence of the configuration registers, and
    > > a function to set the correct setting based on the voltage read back
    > > from the regulator.
    > >
    > > This is only done when the regulator is first acquired and enabled.
    > > While it would be nice to have a notifier on the regulator so that when
    > > the voltage changes, the driver can update the setting, in practice no
    > > board currently supports dynamic changing of the I/O voltages.
    > >
    > > Signed-off-by: Chen-Yu Tsai <wens@csie.org>
    >
    > I merged the v5.0-rc6 into my devel branch and applied this patch on
    > top now.
    >
    > All the DTS file changes should be merged through ARM SoC, and
    > they should work fine now.

    Thanks. Maxime actually merged them last week.

    It seems this isn't in -next yet. I'm not seeing it in your git.kernel.org
    repo either. Might be confusing for others that want to try it out.

    ChenYu

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