This series provides a way to tell a serial UART that it can't actually work, at runtime. The main motivation is to deal with a coreboot feature where it does not provide UART details in the sysinfo structure unless the UART is also enabled in coreboot.
Attempts to introduce a way to enable a silent UART in coreboot have lead to a large amount of discussion but no result, sadly.
This series reworks a patch sent last year, which was not quite ready to be applied. A coreboot user (on irc) hit this problem, so it needs to be resolved.
Link: https://patchwork.ozlabs.org/project/uboot/patch/20231101180447.99361-1-sjg@...
Changes in v3: - Put the feature behind a Kconfig - Move the feature to the serial uclass, so any serial driver can use it
Changes in v2: - Drop RFC tag since there were no comments
Simon Glass (3): serial: Allow a serial port to be silent disabled serial: ns16550: Avoid probing hardware when disabled x86: coreboot: Make use of disabled console
arch/x86/cpu/coreboot/Kconfig | 1 + drivers/serial/Kconfig | 9 +++++++++ drivers/serial/ns16550.c | 3 ++- drivers/serial/serial-uclass.c | 19 ++++++++++++++++++- drivers/serial/serial_coreboot.c | 2 ++ include/serial.h | 25 +++++++++++++++++++++++++ 6 files changed, 57 insertions(+), 2 deletions(-)