phy: fsl-imx8mq-usb: add runtime PM support

Add runtime PM support to ensure the PHY clocks are properly gated
when the PHY is not in use, reducing power consumption.

Clock management is moved from power_on()/power_off() callbacks into
the runtime_resume()/runtime_suspend() callbacks respectively. The PHY
subsystem core already holds a runtime PM reference around init() and
power_on/off() calls, so no explicit clock handling is needed there.

Use devm_clk_get_enabled() and devm_clk_get_optional_enabled() in
probe() to keep clocks enabled initially. This ensures the PHY remains
functional when CONFIG_PM is disabled, where runtime suspend/resume
callbacks are never invoked.

In tca_blk_typec_switch_set(), replace the manual clk_prepare_enable()
/ clk_disable_unprepare() pair with PM_RUNTIME_ACQUIRE_IF_ENABLED() to
guard register access against a concurrently suspended PHY.

Move devm_regulator_get() before pm_runtime_enable() to avoid having
to clean up runtime PM state on regulator acquisition failure.

In remove(), call pm_runtime_get_sync() before pm_runtime_disable() to
ensure the PHY is resumed and clocks are enabled before the devres
teardown disables them.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260731-imx8mp-usb-phy-improvement-v8-3-2ec8d6b3854d@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

0 files changed, 0 insertions, 0 deletions