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serial: 8250: dw: Improve RZN1 support 

Renesas RZ/N1 SoC features a slightly modified DW UART.

On this SoC, the CPR register value is known but not synthetized in
hardware. We hence need to provide a CPR value in the platform
data. This version of the controller also relies on acting as flow
controller when using DMA, so we need to provide the
"is dma flow controller" quirk.

Co-developed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220422180615.9098-10-miquel.raynal@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Phil Edworthy 2022-04-22 20:06:15 +02:00 committed by Greg Kroah-Hartman
parent aa63d786ce
commit 070e246217
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/8250/8250_dw.c
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@ -761,6 +761,8 @@ 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_val = 0x00012f32,
.quirks = DW_UART_QUIRK_IS_DMA_FC,
};
static const struct dw8250_platform_data dw8250_starfive_jh7100_data = {