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

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Message-ID: <20230316164428.GY9667@google.com>
Date:   Thu, 16 Mar 2023 16:44:28 +0000
From:   Lee Jones <lee@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jacky Huang <ychuang570808@...il.com>,
        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

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]