[PATCH v4 2/4] serial: 8250_dw: build Renesas RZN1 CPR value from DW_UART_CPR_* definitions

Jia Wang
2026-04-24T05:40:32Z

Replace the magic CPR value for Renesas RZ/N1 with a composition using
DW_UART_CPR_* bit/field definitions and FIELD_PREP_CONST().

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
---
drivers/tty/serial/8250/8250_dw.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 467755bf0092..d3c2c9c84d9f 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -937,7 +937,15 @@ static const struct dw8250_platform_data dw8250_armada_38x_data = {

static const struct dw8250_platform_data dw8250_renesas_rzn1_data = {
.usr_reg = DW_UART_USR,
- .cpr_value = 0x00012f32,
+ .cpr_value = FIELD_PREP_CONST(DW_UART_CPR_ABP_DATA_WIDTH, 2) |
+ DW_UART_CPR_AFCE_MODE |
+ DW_UART_CPR_THRE_MODE |
+ DW_UART_CPR_ADDITIONAL_FEATURES |
+ DW_UART_CPR_FIFO_ACCESS |
+ DW_UART_CPR_FIFO_STAT |
+ DW_UART_CPR_SHADOW |
+ DW_UART_CPR_DMA_EXTRA |
+ FIELD_PREP_CONST(DW_UART_CPR_FIFO_MODE, 0x01),
.quirks = DW_UART_QUIRK_CPR_VALUE | DW_UART_QUIRK_IS_DMA_FC,
};

--
2.34.1