Introduce component framework to bind child and sibling devices, for better modularity and offload the deferral probe issue to submodule if it need to attach exterinal module someday. Also for better reflect the hardware layout. Hardware units that come with PCIe are all ready to drive, but there are some board specific modules will return -EPROBE_DEFER to us. We need all submodules ready to use before we can register the drm device to userspace. The idea is to device the exterinal module dependent part and exterinal module independent part. For example, the display controller and the GPIO-I2C just belong to exterinal module independent part. While the outputs are just belong to exterinal module dependent part. We abstract the output ports as child devices, the output ports may consists of encoder phy and level shifter. Well, the GPU are standalone siblings relative to the DC. Those units are relatively separated hardware units from display controller itself. By design, the display controller PCI(e) is selected as master, gpio-i2c go with master. Manually created virtual subdevice functional as agents for the master, it could return the -EPROBE_DEFER back to the drvier core. This allows the master don't have to tear down everything, thereore majority setups work can be preserved. The potential cyclic dependency problem can be solved then. v1 -> v2: * Squash patch 0002 and patch 0003 into one * Fill type and improve commit message Sui Jingfeng (3): drm/loongson: Add a helper for creating child devices drm/loongson: Introduce component framework support drm/loongson: Add dummy gpu driver as a subcomponent drivers/gpu/drm/loongson/Makefile | 4 + drivers/gpu/drm/loongson/loong_gpu_pci_drv.c | 90 ++++++++ drivers/gpu/drm/loongson/loong_gpu_pci_drv.h | 27 +++ drivers/gpu/drm/loongson/loongson_device.c | 42 ++++ drivers/gpu/drm/loongson/loongson_module.c | 26 ++- drivers/gpu/drm/loongson/loongson_module.h | 8 + drivers/gpu/drm/loongson/lsdc_drv.c | 217 +++++++++++------- drivers/gpu/drm/loongson/lsdc_drv.h | 45 +--- drivers/gpu/drm/loongson/lsdc_i2c.c | 5 +- drivers/gpu/drm/loongson/lsdc_i2c.h | 3 - drivers/gpu/drm/loongson/lsdc_output.c | 176 ++++++++++++++ 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 | 17 +- 14 files changed, 564 insertions(+), 137 deletions(-) create mode 100644 drivers/gpu/drm/loongson/loong_gpu_pci_drv.c create mode 100644 drivers/gpu/drm/loongson/loong_gpu_pci_drv.h create mode 100644 drivers/gpu/drm/loongson/lsdc_output.c -- 2.34.1
