The SE_GENI_RX_WATERMARK_REG was not being programmed in the RX
setup paths. Set it to DEF_RX_WM (2) in qcom_geni_serial_start_rx(),
msm_geni_serial_setup_rx() and _debug_uart_init() to align with the
Linux kernel driver behaviour.

Without this, the RX FIFO watermark interrupt threshold is left at
its hardware reset value, which may differ from the expected value
and can cause RX data loss or missed watermark interrupts.

Link: https://lore.kernel.org/all/20200227132223.864425794@linuxfoundation.org/
Signed-off-by: Timple Raj M <quic_timple@quicinc.com>
Signed-off-by: Gurumoorthy Santhakumar <gurumoorthy.santhakumar@oss.qualcomm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Reviewed-by: Csey Connolly <casey.connolly@linaro.org>
Link: https://patch.msgid.link/20260421044555.368486-1-gurumoorthy.santhakumar@oss.qualcomm.com
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>

This series from Daniel Palmer <daniel@0x0f.com> improves debug UART
support on QEMU on M68K by adding debug uart support to the serial
driver.

Link: https://lore.kernel.org/r/20260309105110.672832-1-daniel@0x0f.com

Add debug support for the goldfish tty so it can be used for
early debugging. This will be really useful when adding support
for relocation to the m68k qemu virt machine.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Tested-by: Kuan-Wei Chiu <visitorckw@gmail.com>

The HSCIF variant present on Renesas R-Car Gen5 SoC is compatible
with the HSCIF variant present on Renesas R-Car Gen4 SoC. Enable
HSSRR register programming for HSCIF present on all 64-bit R-Car
SoCs, which covers R-Car Gen3, Gen4 and newly also Gen5.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The definition of our ID table (and of_to_plat function) is guarded with
OF_REAL however the U_BOOT_DRIVER that would in turn use the table is
guarded with SERIAL_PRESENT. To avoid a potential warning we must also
guard both with SERIAL_PRESENT.

Signed-off-by: Tom Rini <trini@konsulko.com>

The definition of our ID table is guarded with OF_REAL however the
U_BOOT_DRIVER that would in turn use the table is guarded with
SERIAL_PRESENT. To avoid a potential warning we must also guard the
ID table with SERIAL_PRESENT.

Signed-off-by: Tom Rini <trini@konsulko.com>

There are no longer any users of the legacy non-DM pl01x serial driver.
This lets us remove both CONFIG_PL011_SERIAL as well as
CONFIG_PL011_SERIAL_RLCR references. We still have SPL users of the
non-DM portions of the code.

Signed-off-by: Tom Rini <trini@konsulko.com>

Pre-relocation we may not have a clock but it's usually been enabled for
us already, or worst case we will enable it after relocation. Erroring
out in this case will almost always cause U-Boot to hang pre-relocation
which is undesirable and may be hard to debug.

Link: https://patch.msgid.link/20260320-casey-qcom-rpmh-serial-fixes-v1-1-b81d05832eec@linaro.org
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>

Fix compiler warning:

drivers/serial/ns16550.c: In function ‘serial_in_dynamic’:
drivers/serial/ns16550.c:153:1: warning: control reaches end
    of non-void function [-Wreturn-type]
  153 | }
      | ^

Observed with gcc 15.2.1:

$ riscv64-unknown-linux-gnu-gcc --version
riscv64-unknown-linux-gnu-gcc (Gentoo 15.2.1_p20260214 p5) 15.2.1

Fixes: 62cbde4c4e46 ("serial: ns16550: Support run-time configuration")
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Reviewed-by: Tom Rini <trini@konsulko.com>