u-boot.git/drivers/serial/serial_mtk.c, branch master

serial: mediatek: enable baudrate accuracy compensation

2025-06-05T20:30:35+00:00

The high-speed UART from MediaTek supports baudrate accuracy
compensation when using high-speed mode 3.

This is done by calculating the first digit of the fraction part of
sample count value. The fraction value will be then used as the
reference to insert 0 to 10 sample cycle(s) to one frame (assume
that frame format is 8n1, i.e. 10 bits per frame).

The fracdiv_[l/m] registers are used to determine whether a bit in one frame
should be inserted with one sample cycle.

With typical 40MHz source clock, the actual baudrates with/without
accuracy compensation are:

Ideal    w/o compensation w/ compensation
======== ================ ===============
9600     9603             9600
115200   114942           115207
921600   930232           921659
3000000  3076923          3007519

Signed-off-by: Weijie Gao

serial: mediatek: fix register names and offsets

2025-06-05T20:30:35+00:00

Fix UART register names and offsets according to the programming
guide to allow implementing some enhanced features.

Signed-off-by: Weijie Gao

serial: mediatek: add special handling for highspeed and linux compat

2024-07-08T17:45:50+00:00

Upstream linux serial driver use a different logic to setup serial regs.

They have 2 interval:
- < 115200 we use lowspeed regs and 16 * baud
- >= 115200 we use highspeed

We currently use force_highspeed property to force usage of highspeed
regs even with low baud rate.

Add special handling if the upstream compatible is used where we just
apply the same interval with anything >= 115200 in highspeed simulating
force_highspeed.

Signed-off-by: Christian Marangi

serial: mediatek: add support for bus clock and enable it

2024-07-08T17:45:50+00:00

Upstream linux also provide the additional optional bus clock.

Add support for it and also enable the baud and bus clock on probe.

Signed-off-by: Christian Marangi

Restore patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"

2024-05-20T19:35:03+00:00

As part of bringing the master branch back in to next, we need to allow
for all of these changes to exist here.

Reported-by: Jonas Karlman 
Signed-off-by: Tom Rini

Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet""

2024-05-19T14:16:36+00:00

When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing
changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35.

Reported-by: Jonas Karlman 
Signed-off-by: Tom Rini

serial: Remove and add needed includes

2024-05-07T14:00:56+00:00

Remove  from this driver directory and when needed
add missing include files directly.

Reviewed-by: Peter Robinson 
Signed-off-by: Tom Rini

common: Drop linux/printk.h from common header

2023-09-24T13:54:57+00:00

This old patch was marked as deferred. Bring it back to life, to continue
towards the removal of common.h

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass

serial: mtk: initial priv data before using

2023-08-03T13:40:49+00:00

This patch ensures driver private data being fully initialized in
_debug_uart_init which is not covered by .priv_auto ops.

Signed-off-by: Sam Shih 
Signed-off-by: Weijie Gao 
Reviewed-by: Stefan Roese

kbuild: Remove uncmd_spl logic

2022-12-23T15:15:13+00:00

At this point in the conversion there should be no need to have logic to
disable some symbol during the SPL build as all symbols should have an
SPL counterpart.

The main real changes done here are that we now must make proper use of
CONFIG_IS_ENABLED(DM_SERIAL) rather than many of the odd tricks we
developed prior to CONFIG_IS_ENABLED() being available.

Signed-off-by: Tom Rini