At present ofdata_to_platdata() is done as part of device_probe(). Drivers are supposed to read their platdata in the ofdata_to_platdata method() but this requirement is not always followed.
Having these methods separate helps deal with of-platdata, where the probe() method is common to both DT/of-platdata operation, but the ofdata_to_platdata() method is implemented differently.
Another case has come up where this separate is useful. Generation of ACPI tables uses the of-platdata but does not want to probe the device. Probing would cause U-Boot to violate one of its design principles, viz that it should only probe devices that are used. For ACPI we want to generate a table for each device, even if U-Boot does not use it. In fact it may not even be possible to probe the device - e.g. an SD card which is not present will cause an error on probe, yet we still must tell Linux about the SD card connector in case it is used while Linux is running.
This series splits out the ofdata_to_platdata() part of device_probe() so that it can be used separately from device_probe(). Thus devices now go through two distinct states when probing: reading platform data and actually touching the hardware to bring the device up.
This should not break existing boards since the operations still happen in mostly the same order. The main change is that parents and uclasses are probed after ofdata_to_platdata() is called.
HOWEVER it is quite possible that some boards break the rules and due to a series of unfortunate events, something will break. Two boards were found in this category already. SO this series may require some tidying up from board maintainers, if problems arise.
Note that there are cases where devices must be probed in the ofdata_to_platdata() method. An example is where a GPIO is selected - this obviously requires that the GPIO device is probed.
One board was found to burst its size limit with this series, despite the very small size increase. The patches to remove use of BUG_ON() are to ensure that this series passes tests.
Simon Glass (19): common: Add a noisy assert() dm: core: Use assert_noisy() in devres usb: Drop use of BUG_ON() and WARN_ON() x86: apl: Avoid accessing the PCI bus before it is probed pci: Print a warning if the bus is accessed before probing aspeed: ast2500: Read clock ofdata in the correct method dm: core: Don't clear active flag twice when probe() fails dm: core: Move ofdata_to_platdata() call earlier dm: core: Allocate parent data separate from probing parent dm: core: Add a comment for DM_FLAG_OF_PLATDATA dm: core: Export a new function to read platdata dm: core: Add a new flag to track platform data dm: devres: Create a new devres header file test: Add functions to find the amount of allocated memory dm: devres: Convert to use logging dm: test: Add a test driver for devres dm: devres: Add tests dm: devres: Use an enum for the allocation phase dm: devres: Add a new OFDATA phase
arch/sandbox/dts/test.dts | 4 + arch/x86/cpu/apollolake/p2sb.c | 20 +- arch/x86/cpu/apollolake/pmc.c | 20 +- drivers/clk/aspeed/clk_ast2500.c | 4 +- drivers/core/device-remove.c | 1 + drivers/core/device.c | 56 +++-- drivers/core/devres.c | 57 ++++- drivers/pci/pci-uclass.c | 13 ++ drivers/usb/gadget/composite.c | 4 + drivers/usb/gadget/f_mass_storage.c | 4 + drivers/usb/musb-new/musb_core.c | 4 + drivers/usb/musb-new/musb_gadget_ep0.c | 2 +- include/dm/device-internal.h | 16 ++ include/dm/device.h | 259 +--------------------- include/dm/devres.h | 289 +++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/log.h | 15 ++ include/test/test.h | 10 + include/test/ut.h | 16 ++ test/dm/Makefile | 1 + test/dm/devres.c | 186 ++++++++++++++++ test/dm/test-fdt.c | 58 +++++ test/ut.c | 14 ++ 23 files changed, 760 insertions(+), 294 deletions(-) create mode 100644 include/dm/devres.h create mode 100644 test/dm/devres.c