Hi Marek,
On Sun, 26 Apr 2020 at 04:52, Marek Vasut marek.vasut@gmail.com wrote:
Add another flag to the DM core which could be assigned to drivers and which makes those drivers call their remove callbacks last, just before booting OS and after all the other drivers finished with their remove callbacks. This is necessary for things like clock drivers, where the other drivers might depend on the clock driver in their remove callbacks. Prime example is the mmc subsystem, which can reconfigure a card from HS mode to slower modes in the remove callback and for that it needs to reconfigure the controller clock.
Signed-off-by: Marek Vasut marek.vasut+renesas@gmail.com Cc: Simon Glass sjg@chromium.org Cc: Tom Rini trini@konsulko.com
arch/arm/lib/bootm.c | 1 + drivers/core/device-remove.c | 11 ++++++++--- drivers/core/root.c | 2 ++ include/dm/device.h | 4 ++++ 4 files changed, 15 insertions(+), 3 deletions(-)
I think this solution is simpler than trying to track device dependencies, something that driver model currently makes no attempt to do.
It does need a test though.
Regards, Simon