[v4,0/2] drivers: bus: Add Freescale i.MX8qxp pixel link MSI bus support

Message

Liu Ying Aug. 14, 2022, 7:43 a.m. UTC

Hi,

This series aims to add Freescale i.MX8qxp pixel link MSI bus support
by using the existing simple-pm-bus driver. A power domain and two input
clocks need to be enabled before the MSI bus accesses it's child devices,
which matches what a simple power-managed bus is(See simple-pm-bus.yaml).

Patch 1 enables/disables functional clock(s) as a bulk in the
simple-pm-bus driver when the simple-pm-bus is being power managed,
since the MSI bus takes the two input clocks as functional clocks.

Patch 2 adds dt-bindings for the MSI bus.

v3->v4:
* Drop patch 1 in v3, because simple-bus/simple-mfd devices probed by the
  simple-pm-bus driver should not be child nodes of simple-pm-bus at all,
  as simple-bus/simple-mfd's child devices PM operations cannot be propagated
  to simple-pm-bus. Those simple-bus/simple-mfd devices needs dedicated drivers.
* Drop unnecessary 'bus == NULL' check from simple_pm_bus_runtime_{suspend,resume}.
  for patch 1 in v4. (Geert)
* Add Geert's R-b tag on patch 1 in v4.
* Add child nodes in the example MSI bus node of the MSI bus dt-binding. (Krzysztof)

v2->v3:
* Add a pattern property to allow child nodes in the MSI bus dt-binding. (Rob)

v1->v2:
Address Krzysztof's comments on patch 3:
* Add a select to explicitly select the MSI bus dt-binding.
* List 'simple-pm-bus' explicitly as one item of compatible strings.
* Require compatible and reg properties.
* Put reg property just after compatible property in example.


Liu Ying (2):
  drivers: bus: simple-pm-bus: Use clocks
  dt-bindings: bus: Add Freescale i.MX8qxp pixel link MSI bus binding

 .../bus/fsl,imx8qxp-pixel-link-msi-bus.yaml   | 232 ++++++++++++++++++
 drivers/bus/simple-pm-bus.c                   |  48 ++++
 2 files changed, 280 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml