[PATCH RFT 0/6] serial: sh-sci: Fixes for earlycon and keep_bootcon

[Claudiu]

From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>

Hi,

This series adds fixes for earlycon and keep_bootcon on sh-sci driver.

Patch 1/6 was initially part of [1], then posted as standalone
fix at [2].

Patch 5/6 was integrated but then reverted as issues were identified
after that with it as standalone patch.

I added it in this series to keep all the sh-sci
fixes in the same place. All these fixes are prerequisites for the
Renesas RZ/G3S SCI support.

Series was tested on the boards with the following device trees binaries:
- r8a7742-iwg21d-q7.dtb
- r8a7743-iwg20d-q7.dtb
- r8a7745-iwg22d-sodimm.dtb
- r8a77470-iwg23s-sbc.dtb
- r8a774a1-hihope-rzg2m-ex.dtb
- r8a774b1-hihope-rzg2n-ex.dtb
- r8a774e1-hihope-rzg2h-ex.dtb
- r9a07g043u11-smarc.dtb
- r9a07g044c2-smarc.dtb
- r9a07g044l2-smarc.dtb
- r9a07g054l2-smarc.dtb
- r9a08g045s33-smarc.dtb
- r9a08g045s33-smarc-pmod.dtb (not integrated in the latest kernel tree,
  but the device tree was posted at [3])

in the following scenarios:

1/ "earlycon keep_bootcon" were present in bootargs
2/ only "earlycon" was present in bootargs
3/ none of the "earlycon" or "earlycon keep_bootcon" were present in
   bootargs

1, 2, 3 were tested also with renesas_defconfig on
r9a08g045s33-smarc-pmod.dtb.

Please give it a try on your devices as well.

Thank you,
Claudiu Beznea

[1] https://lore.kernel.org/all/20241115134401.3893008-1-claudiu.beznea.uj@xxxxxxxxxxxxxx/
[2] https://lore.kernel.org/all/20241125115856.513642-1-claudiu.beznea.uj@xxxxxxxxxxxxxx/
[3] https://lore.kernel.org/all/20241115134401.3893008-9-claudiu.beznea.uj@xxxxxxxxxxxxxx/

Claudiu Beznea (6):
  serial: sh-sci: Check if TX data was written to device in .tx_empty()
  serial: sh-sci: Drop __initdata macro for port_cfg
  serial: sh-sci: Move runtime PM enable to sci_probe_single()
  serial: sh-sci: Do not probe the serial port if its slot in
    sci_ports[] is in use
  serial: sh-sci: Clean sci_ports[0] after at earlycon exit
  serial: sh-sci: Increment the runtime usage counter for the earlycon
    device

 drivers/tty/serial/sh-sci.c | 121 ++++++++++++++++++++++++++++++------
 1 file changed, 102 insertions(+), 19 deletions(-)

-- 
2.39.2