[v1,PATCH 1/1] i2c: mediatek: add bus regulator control for power saving

[Chen-Yu Tsai]

On Wed, Mar 18, 2026 at 4:46 PM adlavinitha reddy
<adlavinitha.reddy at mediatek.com> wrote:
>
> Add conditional bus regulator enable/disable in mtk_i2c_transfer()
> to support I2C bus power gating for platforms that require it.
>
> This implementation:
> - Enables bus_regulator before clk_bulk_enable() if vbus-supply is defined
> - Disables bus_regulator after clk_bulk_disable()
> - Only activates when vbus-supply is provided in device tree
> - Has no impact on platforms without vbus-supply defined
>
> This approach provides power savinggs for platforms with an extra I2C bus
> regulator, while avoiding runtime PM complexity.
>
> TEST= Build and boot on MT8188
>
> Signed-off-by: adlavinitha reddy <adlavinitha.reddy at mediatek.com>

Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>