lopper:assists:petalinuxconfig: predict Linux tty device names for se… - #791
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…rial nodes
Emit a `tty_device` field (ttyPS0, ttyUL0, ...) for each serial slave in
sys_hw_data.yaml, reproducing how the kernel serial drivers allocate their
tty line numbers so downstream tooling can map a UART to its Linux console.
The tty prefix is taken from the input schema (sdt_ipinfo.yaml)
`console_prefix` field, matched via the node's compatible string. The line
number is allocated per the actual driver behavior:
- Alias-honoring drivers (ttyPS/xilinx_uartps, ttyAMA/amba-pl011) call
of_alias_get_id("serial"), so a node's serialN alias id becomes the tty
line directly (gaps allowed).
- Dynamic drivers (ttyUL/uartlite, ttyS/8250) ignore the serial alias and
use an explicit `port-number` property, otherwise the next free line in
probe order.
Fixed lines (alias id / port-number) are reserved first, then the remaining
nodes fall back to the lowest free line per prefix, avoiding collisions.
Also drop the redundant `serial_port` field (the info is already carried by
`aliases`) and precompute a compatible->console_prefix lookup so prefix
resolution is O(1) per node instead of rescanning the schema each time.
Signed-off-by: Raju Kumar Pothuraju <rajukumar.pothuraju@amd.com>
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…rial nodes
Emit a
tty_devicefield (ttyPS0, ttyUL0, ...) for each serial slave in sys_hw_data.yaml, reproducing how the kernel serial drivers allocate their tty line numbers so downstream tooling can map a UART to its Linux console.The tty prefix is taken from the input schema (sdt_ipinfo.yaml)
console_prefixfield, matched via the node's compatible string. The line number is allocated per the actual driver behavior:port-numberproperty, otherwise the next free line in probe order.Fixed lines (alias id / port-number) are reserved first, then the remaining nodes fall back to the lowest free line per prefix, avoiding collisions.
Also drop the redundant
serial_portfield (the info is already carried byaliases) and precompute a compatible->console_prefix lookup so prefix resolution is O(1) per node instead of rescanning the schema each time.