linux-kernel - Re: [RFC PATCH 0/9] arm64: dts: meson: add support for aac2xx devices

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Date:   Mon, 06 Dec 2021 19:06:02 +0100
From:   Kevin Hilman <khilman@...libre.com>
To:     Christian Hewitt <christianshewitt@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Neil Armstrong <narmstrong@...libre.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Christian Hewitt <christianshewitt@...il.com>,
        Benoit Masson <yahoo@...enite.com>
Subject: Re: [RFC PATCH 0/9] arm64: dts: meson: add support for aac2xx devices

Christian Hewitt <christianshewitt@...il.com> writes:

> This series adds support for several popular Amlogic S905X3 (SM1) Android
> Set-Top Box devices. Like most Android box devices, they ship in variants
> with multiple RAM, eMMC, WiFi and BT configurations. RAM and eMMC are not
> something we need to consider to get a working boot, but we do need to get
> the correct connectivity spec.

The reason we don't need to care about RAM differences is because u-boot
takes care of that, and updates the DT nodes accordingly.

In general, I'm not a fan of leaving these decisions up to u-boot,
but...  as an option...

I'm pondering if we should do the same for the connectivity settings?  A
properly configured u-boot already knows if it's an internal/external
PHY, Mbit vs Gbit etc. so in a similar way could enable/disable the
right nodes.

We could have a single DTS for each of these board families which
has some reasonable defaults, then u-boot would enable/disable nodes
accordingly.

Kevin