Re: [PATCH RFC 06/11] drm/bridge: analogix-anx78xx: add support for avdd33 regulator

[Linus Walleij]

On Thu, Aug 15, 2019 at 2:49 AM Brian Masney <masneyb@xxxxxxxxxxxxx> wrote:

> Add support for the avdd33 regulator to the analogix-anx78xx driver.
> Note that the regulator is currently enabled during driver probe and
> disabled when the driver is removed. This is currently how the
> downstream MSM kernel sources do this.
>
> Let's not merge this upstream for the mean time until I get the external
> display fully working on the Nexus 5 and then I can submit proper
> support then that powers down this regulator in the power off function.
>
> Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>

> +static void anx78xx_disable_regulator_action(void *_data)
> +{
> +       struct anx78xx_platform_data *pdata = _data;
> +
> +       regulator_disable(pdata->avdd33);
> +}
(...)
> +       err = devm_add_action(dev, anx78xx_disable_regulator_action,
> +                             pdata);

Clever idea. Good for initial support, probably later on it would
need to be reworked using runtime PM so it's not constantly
powered up.

See for example how I try to push down power dissipation
of sensors in 3d838118c6aa.

Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij