From: Jianmin Lv <lvjianmin@xxxxxxxxxxx> ACPI-based Loongson boards need configurable rather than fixed clock frequency for serial ports. Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx> Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx> --- V2: Remove unnecessary braces for single statement blocks drivers/tty/serial/8250/8250_pnp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c index de90d681b64c..5f8fc724ba46 100644 --- a/drivers/tty/serial/8250/8250_pnp.c +++ b/drivers/tty/serial/8250/8250_pnp.c @@ -15,6 +15,7 @@ #include <linux/kernel.h> #include <linux/serial_core.h> #include <linux/bitops.h> +#include <linux/property.h> #include <asm/byteorder.h> @@ -474,7 +475,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE) uart.port.flags |= UPF_SHARE_IRQ; - uart.port.uartclk = 1843200; + if (device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk)) + uart.port.uartclk = 1843200; uart.port.dev = &dev->dev; line = serial8250_register_8250_port(&uart); -- 2.27.0
