On Mon, Jul 05, 2021 at 08:12:38PM +0800, Huacai Chen wrote:
> 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>
> ---
> 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 +475,9 @@ 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
>
Hi,
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