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serial: 8250_mtk: Add ACPI support

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Add ACPI support to 8250_mtk driver. This makes it possible to
use UART on ARM-based desktops with EDK2 UEFI firmware.

Signed-off-by: Yenchia Chen <yenchia.chen@mediatek.com>
Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Link: https://patch.msgid.link/20260423062345.2473300-2-zhiyong.tao@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhiyong Tao 2026-04-23 14:22:45 +08:00 committed by Greg Kroah-Hartman
parent a2083fd1fa
commit f785606039
1 changed files with 19 additions and 4 deletions
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23
drivers/tty/serial/8250/8250_mtk.c
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@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/units.h>
#include "8250.h"
@ -521,6 +522,7 @@ static int mtk8250_probe(struct platform_device *pdev)
struct mtk8250_data *data;
struct resource *regs;
int irq, err;
struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@ -543,12 +545,13 @@ static int mtk8250_probe(struct platform_device *pdev)
data->clk_count = 0;
if (pdev->dev.of_node) {
if (is_of_node(fwnode)) {
err = mtk8250_probe_of(pdev, &uart.port, data);
if (err)
return err;
} else
} else if (!fwnode) {
return -ENODEV;
}
spin_lock_init(&uart.port.lock);
uart.port.mapbase = regs->start;
@ -564,14 +567,18 @@ static int mtk8250_probe(struct platform_device *pdev)
uart.port.startup = mtk8250_startup;
uart.port.set_termios = mtk8250_set_termios;
uart.port.uartclk = clk_get_rate(data->uart_clk);
if (!uart.port.uartclk)
uart.port.uartclk = 26 * HZ_PER_MHZ;
#ifdef CONFIG_SERIAL_8250_DMA
if (data->dma)
uart.dma = data->dma;
#endif
/* Disable Rate Fix function */
writel(0x0, uart.port.membase +
if (is_of_node(fwnode)) {
/* Disable Rate Fix function */
writel(0x0, uart.port.membase +
(MTK_UART_RATE_FIX << uart.port.regshift));
}
platform_set_drvdata(pdev, data);
@ -649,11 +656,19 @@ static const struct of_device_id mtk8250_of_match[] = {
};
MODULE_DEVICE_TABLE(of, mtk8250_of_match);
static const struct acpi_device_id mtk8250_acpi_match[] = {
{ "MTKI0511" },
{ "NVDA0240" },
{}
};
MODULE_DEVICE_TABLE(acpi, mtk8250_acpi_match);
static struct platform_driver mtk8250_platform_driver = {
.driver = {
.name = "mt6577-uart",
.pm = &mtk8250_pm_ops,
.of_match_table = mtk8250_of_match,
.acpi_match_table = mtk8250_acpi_match,
},
.probe = mtk8250_probe,
.remove = mtk8250_remove,