Commit 13043207 authored by Jianmin Lv's avatar Jianmin Lv Committed by Greg Kroah-Hartman
Browse files

serial: 8250_pnp: Support configurable clock frequency 



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

Signed-off-by: default avatarJianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/20210715061637.134436-1-chenhuacai@loongson.cn


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cb3ea80b

drivers/tty/serial/8250/8250_pnp.c

+2 −0
Original line number Diff line number Diff line
@@ -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);