Introduce the component framework to bind childs and siblings, for better modularity and paper over the deferral probe problems if it need to attach exterinal module someday. Hardware units come with PCI(e) are actually all ready to drive, but there has some board specific modules will return -EPROBE_DEFER. We need all other submodules ready to attach before we can register the drm device to userspace. The idea is to devide the exterinal module dependent part and exterinal module independent part clearly, for example, the display controller and the builtin GPIO-I2C just belong to exterinal module independent part. While the output is belong to exterinal module dependent part. Also for better reflecting the hardware, we intend to abstract the output ports as child devices. The output ports may consists of encoder phy and level shift, while the GPU and VPU are standalone siblings. As those units are relative separate hardware units from display controller itself. By design, the display controller PCI(e) is selected as the component master, gpio-i2c go with master. The manually created virtual child device are functional as agents for the master, it could return the -EPROBE_DEFER back to the component core. This allows the master don't have to tear down everything, the majority setups work can be preserved. The potential cyclic dependency problem can be solved with such framework. Sui Jingfeng (3): drm/loongson: Add helpers for creating subdevice drm/loongson: Introduce component framework support drm/loongson: Refactor lsdc device initialize and the output port drivers/gpu/drm/loongson/Makefile | 1 + drivers/gpu/drm/loongson/loongson_device.c | 42 ++++ drivers/gpu/drm/loongson/loongson_module.c | 17 +- drivers/gpu/drm/loongson/loongson_module.h | 1 + drivers/gpu/drm/loongson/lsdc_drv.c | 208 +++++++++++------- drivers/gpu/drm/loongson/lsdc_drv.h | 34 +-- drivers/gpu/drm/loongson/lsdc_output.c | 183 +++++++++++++++ drivers/gpu/drm/loongson/lsdc_output.h | 38 +++- drivers/gpu/drm/loongson/lsdc_output_7a1000.c | 3 +- drivers/gpu/drm/loongson/lsdc_output_7a2000.c | 15 +- 10 files changed, 422 insertions(+), 120 deletions(-) create mode 100644 drivers/gpu/drm/loongson/lsdc_output.c -- 2.34.1