diff mbox series

[v2,09/10] serial: 8250: dw: Improve RZN1 support

Message ID 20220317174627.360815-10-miquel.raynal@bootlin.com
State Superseded
Headers show
Series serial: 8250: dw: RZN1 DMA support | expand

Commit Message

Miquel Raynal March 17, 2022, 5:46 p.m. UTC 
From: Phil Edworthy <phil.edworthy@renesas.com>

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.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Co-developed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/tty/serial/8250/8250_dw.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index edb3f347be8e..9b393770d40e 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -756,6 +756,11 @@  static const struct dw8250_platform_data dw8250_armada_38x_data = {
 	.quirks = DW_UART_QUIRK_ARMADA_38X,
 };
 
+static const struct dw8250_platform_data dw8250_renesas_rzn1_data = {
+	.quirks = DW_UART_QUIRK_IS_DMA_FLOW_CONTROLLER,
+	.cpr = 0x00012f32,
+};
+
 static const struct dw8250_platform_data dw8250_starfive_jh7100_data = {
 	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
 };
@@ -764,7 +769,7 @@  static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "snps,dw-apb-uart" },
 	{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
 	{ .compatible = "marvell,armada-38x-uart", .data = &dw8250_armada_38x_data },
-	{ .compatible = "renesas,rzn1-uart" },
+	{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },
 	{ .compatible = "starfive,jh7100-hsuart", .data = &dw8250_starfive_jh7100_data },
 	{ .compatible = "starfive,jh7100-uart", .data = &dw8250_starfive_jh7100_data },
 	{ /* Sentinel */ }