linux-kernel - Re: [PATCH 1/7] MIPS: dts: Add aliases node for lantiq danube serial

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Message-ID: <32ff76eb-6711-f0f2-2d83-6887a961855f@linux.intel.com>
Date:   Tue, 19 Jun 2018 14:46:27 +0800
From:   "Wu, Songjun" <songjun.wu@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     hua.ma@...ux.intel.com, yixin.zhu@...ux.intel.com,
        chuanhua.lei@...el.com,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        qi-ming.wu@...el.com, linux-clk <linux-clk@...r.kernel.org>,
        linux-serial@...r.kernel.org, DTML <devicetree@...r.kernel.org>,
        James Hogan <jhogan@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Rob Herring <robh+dt@...nel.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 1/7] MIPS: dts: Add aliases node for lantiq danube serial



On 6/18/2018 6:59 PM, Arnd Bergmann wrote:
> On Mon, Jun 18, 2018 at 11:42 AM, Wu, Songjun
> <songjun.wu@...ux.intel.com> wrote:
>> On 6/14/2018 6:03 PM, Arnd Bergmann wrote:
>>> On Tue, Jun 12, 2018 at 7:40 AM, Songjun Wu <songjun.wu@...ux.intel.com>
>>> wrote:
>>>> Previous implementation uses a hard-coded register value to check if
>>>> the current serial entity is the console entity.
>>>> Now the lantiq serial driver uses the aliases for the index of the
>>>> serial port.
>>>> The lantiq danube serial dts are updated with aliases to support this.
>>>>
>>>> Signed-off-by: Songjun Wu <songjun.wu@...ux.intel.com>
>>>> ---
>>>>
>>>>    arch/mips/boot/dts/lantiq/danube.dtsi | 6 +++++-
>>>>    1 file changed, 5 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/mips/boot/dts/lantiq/danube.dtsi
>>>> b/arch/mips/boot/dts/lantiq/danube.dtsi
>>>> index 2dd950181f8a..7a9e15da6bd0 100644
>>>> --- a/arch/mips/boot/dts/lantiq/danube.dtsi
>>>> +++ b/arch/mips/boot/dts/lantiq/danube.dtsi
>>>> @@ -4,6 +4,10 @@
>>>>           #size-cells = <1>;
>>>>           compatible = "lantiq,xway", "lantiq,danube";
>>>>
>>>> +       aliases {
>>>> +               serial0 = &asc1;
>>>> +       };
>>>> +
>>> You generally want the aliases to be part of the board specific file,
>>> not every board numbers their serial ports in the same way.
>>>
>> In this chip only asc1 can be used as console,  so serial0 is defined in
>> chip specific file.
> This was a more general comment about 'aliases' being board specific
> in principle (though we've had exceptions in the past). Even if there
> is only one uart on the chip, I'd recommend following the same
> conventions as the other chips that have more than one uart.
>
>         Arnd
Accept, 'aliases' will be move to the board specific file.