[PATCH v3 0/1] phy: fsl-imx8-mipi-dphy: Hook into runtime pm

[Guido Günther]

This allows us to shut down the mipi power domain on the imx8. The alternative
would be to drop the dphy from the mipi power domain in the SOCs device tree
and only have the DSI host controller visible there but since the PD is mostly
about the PHY that would defeat it's purpose.

This is basically a resend from February 2020 which went without feedback.

This allows to shut off the power domain hen blanking the LCD panel:

pm_genpd_summary before:

domain                          status          slaves
    /device                                             runtime status
----------------------------------------------------------------------
mipi                            on
    /devices/platform/soc at 0/soc at 0:bus at 30800000/30a00300.dphy  unsupported
    /devices/platform/soc at 0/soc at 0:bus at 30800000/30a00000.mipi_dsi  suspended

after:

mipi                            off-0
    /devices/platform/soc at 0/soc at 0:bus at 30800000/30a00300.dphy  suspended
    /devices/platform/soc at 0/soc at 0:bus at 30800000/30a00000.mipi_dsi  suspended

Changes from v1:
 - Tweak commit message slightly

Changes from v2:
  - As pre review comment by Lucas Stach
    https://lore.kernel.org/linux-arm-kernel/ee22b072e0abe07559a3e6a63ccf6ece064a46cb.camel@pengutronix.de/
    Check for pm_runtime_get_sync failure

Guido Günther (1):
  phy: fsl-imx8-mipi-dphy: Hook into runtime pm

 .../phy/freescale/phy-fsl-imx8-mipi-dphy.c    | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

-- 
2.29.2