On 2022-08-03 13:26, Nipun Gupta wrote:

Devices in FPGA can be added/modified dynamically on run-time.
These devices are exposed on system bus to embedded CPUs.

CDX is an upcoming bus, that caters to the requirement for
dynamically discovered FPGA devices. These devices are added
as platform devices where fwnode is created using 'software
nodes' in Linux framework.

This RFC targets to solves 2 issues when adding devices
dynamically using platform_device_register API.

1. It creates a MSI domain for CDX bus devices, which can
    discover device ID used by GIC ITS without depending
    on of_node.
2. Since these devices are not present in device tree, it
    creates a sysfs entry to expose the compatible string.

Isn't this pretty much what CONFIG_OF_DYNAMIC is for? From the look of 
these patches this thing is still completely tied to devicetree, so why 
reinvent that wheel?

Robin.

Nipun Gupta (2):
   irqchip: cdx-bus: add cdx-MSI domain with gic-its domain as parent
   driver core: add compatible string in sysfs for platform devices

  drivers/base/platform.c                  |  15 +++
  drivers/irqchip/Makefile                 |   1 +
  drivers/irqchip/irq-gic-v3-its-cdx-msi.c | 114 +++++++++++++++++++++++
  include/linux/cdx/cdx.h                  |  15 +++
  4 files changed, 145 insertions(+)
  create mode 100644 drivers/irqchip/irq-gic-v3-its-cdx-msi.c
  create mode 100644 include/linux/cdx/cdx.h

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