[v3,0/3] DCMI set minimum cpufreq requirement

Message

Benjamin GAIGNARD June 4, 2020, 12:39 p.m. UTC

This series allow to STM32 camera interface (DCMI) to require a minimum
frequency to the CPUs before start streaming frames from the sensor.
The minimum frequency requirement is provided in the devide-tree node.

Setting a minimum frequency for the CPUs is needed to ensure a quick handling
of the interrupts between two sensor frames and avoid dropping half of them.

version 3:
- add a cpumask field to track boosted CPUs
- add irq_affinity_notify callback
- protect cpumask field with a mutex 

Benjamin Gaignard (3):
  dt-bindings: media: stm32-dcmi: Add DCMI min frequency property
  media: stm32-dcmi: Set minimum cpufreq requirement
  ARM: dts: stm32: Set DCMI frequency requirement for stm32mp15x

 .../devicetree/bindings/media/st,stm32-dcmi.yaml   |   8 +
 arch/arm/boot/dts/stm32mp151.dtsi                  |   1 +
 drivers/media/platform/stm32/stm32-dcmi.c          | 187 ++++++++++++++++++++-
 3 files changed, 188 insertions(+), 8 deletions(-)