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Date:   Wed,  6 May 2020 17:02:01 +0900
From:   Hyunki Koo <>
        Hyunki Koo <>
Subject: [PATCH v10 0/3] 32-bit access for TX/RX hold registers for
 samsung_tty driver

Change in v10:
- add reviewd by and tested by in commit of each patch

Change in v9:
- move wr_reg_barrier into ifdef of CONFIG_SERIAL_SAMSUNG_CONSOLE
  to fix following build error for x86 build
  CC [M]  drivers/tty/serial/samsung_tty.o
  drivers/tty/serial/samsung_tty.c:186:13: warning: ‘wr_reg_barrier’
  defined but not used [-Wunused-function]

Change in v8:
- spit into 3 patch
  [1/3] create the new functions with no functional change to the code as-is.
  Replace rd_regb/wr_regb with rd_reg/wr_reg for general usage.
  [2/3] add the new binding reg-io-width in device tree
  [3/3] add the new funtinality of rd_reg / wr_reg and wr_reg_barrier 
        to support 32-bit access for the TX/RX hold registers UTXH and URXH.

Change in v7:
- [1/2] correct build error on running 'make dt_binding_check' 
Documentation/devicetree/bindings/serial/samsung_uart.yaml:  mapping values are not allowed in this context
  in "<unicode string>", line 36, column 13
  Documentation/devicetree/bindings/Makefile:12: recipe for target 'Documentation/devicetree/bindings/serial/samsung_uart.example.dts' failed
  make[1]: *** [Documentation/devicetree/bindings/serial/samsung_uart.example.dts] Error 1
  make[1]: *** Waiting for unfinished jobs....
  Makefile:1262: recipe for target 'dt_binding_check' failed
  make: *** [dt_binding_check] Error 2
- [2/2] add commit message of reviewed by and tested by in commit message
  Reviewed-by: Krzysztof Kozlowski <>
  Tested on Odroid HC1 (Exynos5422):
  Tested-by: Krzysztof Kozlowski <>

Change in v6:
- [2/2] clean description of reg-io-width
  allOf is not needed. Just enum [1, 2] is enough.

Changes in v5:
- spit into 2 patch, newly added patch for dt-binding
  [1/2] newly added dt-binding and go as first patch in this series.
  [2/2] go as second patch in this series.

Changes in v4:
- correct variable types and change misleading function name

Changes in v3:
- line 2031: remove redundant init value  for ourport->port.iotype

Changes in v2:
- line 954 : change rd_regl to rd_reg in for backward compatibility.
- line 2031: Add init value for ourport->port.iotype  to UPIO_MEM

Hyunki Koo (3):
  serial: samsung: Replace rd_regb/wr_regb with rd_reg/wr_reg
  dt-bindings: serial: Add reg-io-width compatible
  tty: samsung_tty: 32-bit access for TX/RX hold registers

 .../devicetree/bindings/serial/samsung_uart.yaml   |  8 +++
 drivers/tty/serial/samsung_tty.c                   | 76 ++++++++++++++++++----
 2 files changed, 72 insertions(+), 12 deletions(-)


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