2 * Copyright (c) 2018 Alexander Graf <agraf@suse.de>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <dm/pinctrl.h>
11 #include <dm/platform_data/serial_pl01x.h>
12 #include "serial_pl01x_internal.h"
15 * Check if this serial device is muxed
17 * The serial device will only work properly if it has been muxed to the serial
18 * pins by firmware. Check whether that happened here.
20 * @return true if serial device is muxed, false if not
22 static bool bcm283x_is_serial_muxed(void)
27 if (uclass_first_device(UCLASS_PINCTRL, &dev) || !dev)
30 if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT0)
36 static int bcm283x_pl011_serial_ofdata_to_platdata(struct udevice *dev)
38 struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
41 /* Don't spawn the device if it's not muxed */
42 if (!bcm283x_is_serial_muxed())
45 ret = pl01x_serial_ofdata_to_platdata(dev);
50 * TODO: Reinitialization doesn't always work for now, just skip
51 * init always - we know we're already initialized
53 plat->skip_init = true;
58 static const struct udevice_id bcm283x_pl011_serial_id[] = {
59 {.compatible = "brcm,bcm2835-pl011", .data = TYPE_PL011},
63 U_BOOT_DRIVER(bcm283x_pl011_uart) = {
64 .name = "bcm283x_pl011",
66 .of_match = of_match_ptr(bcm283x_pl011_serial_id),
67 .ofdata_to_platdata = of_match_ptr(bcm283x_pl011_serial_ofdata_to_platdata),
68 .platdata_auto_alloc_size = sizeof(struct pl01x_serial_platdata),
69 .probe = pl01x_serial_probe,
70 .ops = &pl01x_serial_ops,
71 .flags = DM_FLAG_PRE_RELOC,
72 .priv_auto_alloc_size = sizeof(struct pl01x_priv),