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 <krzk@xxxxxxxxxx> Tested on Odroid HC1 (Exynos5422): Tested-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx> 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(-) -- 2.15.0.rc1