[PATCH v4 0/3] serial: 8250_pnp: Support configurable reg shift property

From: Guanbing Huang
Date: Wed Apr 03 2024 - 03:42:28 EST


From: Guanbing Huang <albanhuang@xxxxxxxxxxx>

The 16550a serial port based on the ACPI table requires obtaining the
reg-shift attribute. In the ACPI scenario, If the reg-shift property
is not configured like in DTS, the 16550a serial driver cannot read or
write controller registers properly during initialization.

To address the issue of configuring the reg-shift property, the
__uart_read_properties() universal interface is called to implement it.
Adaptation of pnp devices is done in the __uart_read_properties() function.

Guanbing Huang (3):
pnp: Add dev_is_pnp() macro
serial: 8250_port: Add support of pnp irq to __uart_read_properties()
serial: 8250_pnp: Support configurable reg shift property

drivers/tty/serial/8250/8250_pnp.c | 36 ++++++++++++++++++++----------
drivers/tty/serial/serial_port.c | 7 +++++-
include/linux/pnp.h | 2 ++
3 files changed, 32 insertions(+), 13 deletions(-)

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2.17.1