linux-kernel - Re: [PATCH 11/15] arm64: dts: nuvoton: Add initial ma35d1 device tree

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Date:   Sat, 18 Mar 2023 21:32:21 +0800
From:   Jacky Huang <ychuang570808@...il.com>
To:     Lee Jones <lee@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, schung@...oton.com,
        Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH 11/15] arm64: dts: nuvoton: Add initial ma35d1 device tree

Hi Lee,


Thanks for your attentions.


On 2023/3/17 上午 12:44, Lee Jones wrote:
> On Thu, 16 Mar 2023, Arnd Bergmann wrote:
>
>> On Wed, Mar 15, 2023, at 08:28, Jacky Huang wrote:
>>> +	mem: memory@...00000 {
>>> +		device_type = "memory";
>>> +		reg = <0x00000000 0x80000000 0 0x20000000>; /* 512M DRAM */
>>> +	};
>>> +};
>> In most machines, the memory size is detected by the boot loader
>> and filled in the dtb in memory before starting the kernel, so
>> you should not need two separate files here for the two common
>> memory configurations.
>>
>> Since the machine is called 'som', I would assume that this is a
>> module that is integrated on another board, so more commonly one
>> would have a dtsi file for the som in addition to the one for the
>> soc, and have all the components of the module listed in this
>> file, while the dts file that includes the som.dtsi lists the
>> devices on the carrier board and enables the on-chip devices
>> that are connected to the outside.
> It's using syscon and simple-mfd by the looks of it.
>
> --
> Lee Jones [李琼斯]


We just copy from what other chips's dts have done.

This seems be defined in Documentation\devicetree\bindings\numa.txt.


Best regards,

Jacky Huang