Re: [PATCH 1/9] pinctrl: sunxi: Support I/O bias voltage setting on A80
From: Linus Walleij
Date: Mon Feb 11 2019 - 03:21:08 EST
On Wed, Feb 6, 2019 at 4:32 AM Chen-Yu Tsai <wens@xxxxxxxx> 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@xxxxxxxx>
I merged the v5.0-rc6 into my devel branch and applied this patch on
All the DTS file changes should be merged through ARM SoC, and
they should work fine now.