> From: James Hastings <moosetek4@gmail.com>
> Date: Mon, 29 Jan 2024 01:29:46 -0500 (EST)
> 
> Add support to com(4) for the UARTs found on MediaTek SoCs.
> 
> The "common compatible" on mainstream devicetree is "mediatek,mt6577-uart".
> This supports most arm64 and armv7 MediaTek SoCs.
> 
> Datasheets claim 16550A compatibility so set sc_uarttype accordingly.
> 
> Serial output below from Banana Pi BPI-R64 (MT7622).
> 
> ok?

ok kettenis@

> Index: dev/fdt/com_fdt.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/fdt/com_fdt.c,v
> retrieving revision 1.8
> diff -u -p -r1.8 com_fdt.c
> --- dev/fdt/com_fdt.c	15 Aug 2023 07:56:27 -0000	1.8
> +++ dev/fdt/com_fdt.c	23 Jan 2024 00:35:15 -0000
> @@ -55,6 +55,7 @@ com_fdt_init_cons(void)
>  
>  	if ((node = fdt_find_cons("brcm,bcm2835-aux-uart")) == NULL &&
>  	    (node = fdt_find_cons("marvell,armada-38x-uart")) == NULL &&
> +	    (node = fdt_find_cons("mediatek,mt6577-uart")) == NULL &&
>  	    (node = fdt_find_cons("ns16550a")) == NULL &&
>  	    (node = fdt_find_cons("snps,dw-apb-uart")) == NULL &&
>  	    (node = fdt_find_cons("ti,omap3-uart")) == NULL &&
> @@ -96,6 +97,7 @@ com_fdt_match(struct device *parent, voi
>  
>  	return (OF_is_compatible(faa->fa_node, "brcm,bcm2835-aux-uart") ||
>  	    OF_is_compatible(faa->fa_node, "marvell,armada-38x-uart") ||
> +	    OF_is_compatible(faa->fa_node, "mediatek,mt6577-uart") ||
>  	    OF_is_compatible(faa->fa_node, "ns16550a") ||
>  	    OF_is_compatible(faa->fa_node, "snps,dw-apb-uart") ||
>  	    OF_is_compatible(faa->fa_node, "ti,omap3-uart") ||
> @@ -140,6 +142,9 @@ com_fdt_attach(struct device *parent, st
>  
>  	sc->sc_reg_width = OF_getpropint(faa->fa_node, "reg-io-width", width);
>  	sc->sc_reg_shift = OF_getpropint(faa->fa_node, "reg-shift", shift);
> +
> +	if (OF_is_compatible(faa->fa_node, "mediatek,mt6577-uart"))
> +		sc->sc_uarttype = COM_UART_16550A;
>  
>  	if (OF_is_compatible(faa->fa_node, "snps,dw-apb-uart") ||
>  	    OF_is_compatible(faa->fa_node, "marvell,armada-38x-uart")) {
> 
> 
> 
> MT7622> dhcp BOOTAA64.EFI
> MT7622> tftpboot 0x48800000 mt7622-bpi-r64.dtb
> MT7622> bootefi 0x48000000 0x48800000
> Booting /BOOTAA64.EFI
> disks: sd0 sd1
> >> OpenBSD/arm64 BOOTAA64 1.18
> boot> bsd
> booting tftp0a:bsd
> [ using 2914592 bytes of bsd ELF symbol table ]
> Copyright (c) 1982, 1986, 1989, 1991, 1993
> The Regents of the University of California.  All rights reserved.
> Copyright (c) 1995-2024 OpenBSD. All rights reserved.  https://www.OpenBSD.org
> 
> OpenBSD 7.4-current (GENERIC.MP) #11: Sat Jan 20 21:28:19 EST 2024
>     hastings@arm64.moose-tek.test:/usr/src/sys/arch/arm64/compile/GENERIC.MP
> real mem  = 1072095232 (1022MB)
> avail mem = 998666240 (952MB)
> random: good seed from bootblocks
> mainbus0 at root: Bananapi BPI-R64
> psci0 at mainbus0: PSCI 1.1, SMCCC 1.4, SYSTEM_SUSPEND
> efi0 at mainbus0: UEFI 2.10
> efi0: Das U-Boot rev 0x20230700
> smbios0 at efi0: SMBIOS 3.0
> smbios0: vendor U-Boot version "2023.07.02-OpenWrt-r24627-3eca9ba53f" date 07/01/2023
> smbios0: Unknown Unknown Product
> cpu0 at mainbus0 mpidr 0: ARM Cortex-A53 r0p4
> cpu0: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu0: 256KB 64b/line 16-way L2 cache
> cpu0: CRC32,SHA2,SHA1,AES+PMULL,ASID16
> cpu1 at mainbus0 mpidr 1: ARM Cortex-A53 r0p4
> cpu1: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu1: 256KB 64b/line 16-way L2 cache
> cpu1: CRC32,SHA2,SHA1,AES+PMULL,ASID16
> "ramoops" at mainbus0 not configured
> "secmon" at mainbus0 not configured
> apm0 at mainbus0
> syscon0 at mainbus0: "infracfg"
> syscon1 at mainbus0: "pericfg"
> syscon2 at mainbus0: "power-controller"
> syscon3 at mainbus0: "apmixedsys"
> syscon4 at mainbus0: "topckgen"
> ampintc0 at mainbus0 nirq 288, ncpu 4 ipi: 0, 1, 2: "interrupt-controller"
> syscon5 at mainbus0: "clock-controller"
> syscon6 at mainbus0: "ssusbsys"
> syscon7 at mainbus0: "pciesys"
> syscon8 at mainbus0: "pciecfg"
> syscon9 at mainbus0: "syscon"
> syscon10 at mainbus0: "syscon"
> syscon11 at mainbus0: "pcie-mirror"
> syscon12 at mainbus0: "wed"
> syscon13 at mainbus0: "wed"
> syscon14 at mainbus0: "ethernet"
> syscon15 at mainbus0: "sgmiisys"
> "opp-table" at mainbus0 not configured
> "dummy40m" at mainbus0 not configured
> "oscillator" at mainbus0 not configured
> "pmu" at mainbus0 not configured
> agtimer0 at mainbus0: 12500 kHz
> "pwrap" at mainbus0 not configured
> "cir" at mainbus0 not configured
> "interrupt-controller" at mainbus0 not configured
> "efuse" at mainbus0 not configured
> "rng" at mainbus0 not configured
> "pinctrl" at mainbus0 not configured
> "watchdog" at mainbus0 not configured
> "rtc" at mainbus0 not configured
> "cci" at mainbus0 not configured
> "adc" at mainbus0 not configured
> com0 at mainbus0: ns16550a, 16 byte fifo
> com0: console
> "pwm" at mainbus0 not configured
> "i2c" at mainbus0 not configured
> "i2c" at mainbus0 not configured
> "spi" at mainbus0 not configured
> "thermal" at mainbus0 not configured
> "serial" at mainbus0 not configured
> "spi" at mainbus0 not configured
> "ecc" at mainbus0 not configured
> "mmc" at mainbus0 not configured
> "mmc" at mainbus0 not configured
> "wmac" at mainbus0 not configured
> "usb" at mainbus0 not configured
> "t-phy" at mainbus0 not configured
> "pcie" at mainbus0 not configured
> "pcie" at mainbus0 not configured
> "dma-controller" at mainbus0 not configured
> gpiokeys0 at mainbus0: "factory", "wps"
> gpioleds0 at mainbus0: "bpi-r64:pio:green", "bpi-r64:pio:red"
> "regulator-1p8v" at mainbus0 not configured
> "regulator-3p3v" at mainbus0 not configured
> "regulator-5v" at mainbus0 not configured
> vscsi0 at root
> scsibus0 at vscsi0: 256 targets
> softraid0 at root
> scsibus1 at softraid0: 256 targets
> root device: 
> use one of: exit
> root device: exit
> syncing disks... done
> 
>