From: Dai Okamura <okamura.dai@xxxxxxxxxxxxx>
Add selective auto-flow-control support for UniPhier serial driver.
Signed-off-by: Dai Okamura <okamura.dai@xxxxxxxxxxxxx>
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
Changes in v2: None
Documentation/devicetree/bindings/serial/uniphier-uart.txt | 3 +++
drivers/tty/serial/8250/8250_uniphier.c | 3 +++
2 files changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/uniphier-uart.txt b/Documentation/devicetree/bindings/serial/uniphier-uart.txt
index 811c479..7a1bf02 100644
--- a/Documentation/devicetree/bindings/serial/uniphier-uart.txt
+++ b/Documentation/devicetree/bindings/serial/uniphier-uart.txt
@@ -6,6 +6,9 @@ Required properties:
- interrupts: a single interrupt specifier.
- clocks: phandle to the input clock.
+Optional properties:
+-auto-flow-control: enable automatic flow control support.
+
Example:
aliases {
serial0 = &serial0;
diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
index 1028c02..164ba13 100644
--- a/drivers/tty/serial/8250/8250_uniphier.c
+++ b/drivers/tty/serial/8250/8250_uniphier.c
@@ -222,6 +222,9 @@ static int uniphier_uart_probe(struct platform_device *pdev)
up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE;
up.capabilities = UART_CAP_FIFO;
+ if (of_property_read_bool(dev->of_node, "auto-flow-control"))
+ up.capabilities |= UART_CAP_AFE;
+
up.port.serial_in = uniphier_serial_in;
up.port.serial_out = uniphier_serial_out;
up.dl_read = uniphier_serial_dl_read;
--
2.7.4
