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serial: 8250_pnp: Support configurable clock frequency
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> Link: https://lore.kernel.org/r/20210715061637.134436-1-chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -13,6 +13,7 @@
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#include <linux/pnp.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/property.h>
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#include <linux/serial_core.h>
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#include <linux/bitops.h>
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@ -475,6 +476,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
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if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
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uart.port.flags |= UPF_SHARE_IRQ;
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uart.port.uartclk = 1843200;
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device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk);
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uart.port.dev = &dev->dev;
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line = serial8250_register_8250_port(&uart);
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