linux-kernel - Re: [PATCH v2] MIPS: Loongson: Enable devicetree based probing for 8250 ports in defconfig

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Date:   Mon, 18 May 2020 09:50:17 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH v2] MIPS: Loongson: Enable devicetree based probing for
 8250 ports in defconfig

On Mon, May 18, 2020 at 10:11:01AM +0800, Tiezhu Yang wrote:
> After commit 87fcfa7b7fe6 ("MIPS: Loongson64: Add generic dts"),
> there already exists the node and property of Loongson CPU UART0
> in loongson3-package.dtsi:
> 
> cpu_uart0: serial@...001e0 {
>         compatible = "ns16550a";
>         reg = <0 0x1fe001e0 0x8>;
>         clock-frequency = <33000000>;
>         interrupt-parent = <&liointc>;
>         interrupts = <10 IRQ_TYPE_LEVEL_HIGH>;
>         no-loopback-test;
> };
> 
> In order to support for serial console on the Loongson platform,
> add CONFIG_SERIAL_OF_PLATFORM=y to loongson3_defconfig.
> 
> With this patch, we can see the following boot messages:
> 
> [    1.877745] printk: console [ttyS0] disabled
> [    1.881979] 1fe001e0.serial: ttyS0 at MMIO 0x1fe001e0 (irq = 16, base_baud = 2062500) is a 16550A
> [    1.890838] printk: console [ttyS0] enabled
> 
> And also, we can login normally from the serial console.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> 
> v2:
>   - Modify the patch subject
> 
>  arch/mips/configs/loongson3_defconfig | 1 +
>  1 file changed, 1 insertion(+)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]