Re: [PATCH v2 1/9] mfd: axp20x: Mark AXP20X_VBUS_IPSOUT_MGMT as volatile

[Chen-Yu Tsai]

On Sun, Jan 5, 2020 at 9:24 AM Samuel Holland <samuel@xxxxxxxxxxxx> wrote:
>
> On AXP288 and newer PMICs, bit 7 of AXP20X_VBUS_IPSOUT_MGMT can be set
> to prevent using the VBUS input. However, when the VBUS unplugged and
> plugged back in, the bit automatically resets to zero.
>
> We need to set the register as volatile to prevent regmap from caching
> that bit. Otherwise, regcache will think the bit is already set and not
> write the register.
>
> Fixes: cd53216625a0 ("mfd: axp20x: Fix axp288 volatile ranges")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>

Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxx>