diff mbox series

[V3] serial: 8250_pnp: Support configurable clock frequency

Message ID 20210715061637.134436-1-chenhuacai@loongson.cn
State New
Headers show
Series [V3] serial: 8250_pnp: Support configurable clock frequency | expand

Commit Message

陈华才 July 15, 2021, 6:16 a.m. UTC 
From: Jianmin Lv <lvjianmin@loongson.cn>

ACPI-based Loongson boards need configurable rather than fixed clock
frequency for serial ports.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
V2: Remove unnecessary braces for single statement blocks
V3: Remove unnecessary conditional statement
 drivers/tty/serial/8250/8250_pnp.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c
index de90d681b64c..98e5ee4d0d08 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -13,6 +13,7 @@ 
 #include <linux/pnp.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
+#include <linux/property.h>
 #include <linux/serial_core.h>
 #include <linux/bitops.h>
 
@@ -475,6 +476,7 @@  serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 	if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
 		uart.port.flags |= UPF_SHARE_IRQ;
 	uart.port.uartclk = 1843200;
+	device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk);
 	uart.port.dev = &dev->dev;
 
 	line = serial8250_register_8250_port(&uart);