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

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Message-ID: <51fb0be9-9186-3d79-38fa-b8a5151ccba9@baylibre.com>
Date:   Tue, 30 Nov 2021 11:40:20 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Christian Hewitt <christianshewitt@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Benoit Masson <yahoo@...enite.com>
Subject: Re: [RFC PATCH 0/9] arm64: dts: meson: add support for aac2xx devices

Hi,

On 30/11/2021 07:05, Christian Hewitt wrote:
> 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. Broadly speaking we see boxes with Higher
> and Lower spec connectivity; High spec is Gigabit Ethernet and Faster dual
> antennna WiFi, and Lower spec is Megabit Ethernet and a single antenna. In
> some low-end boxes BT is ommitted.
> 
> The main reason for the RFC tag is to solicit feedback on the choice of
> the -100 and -1000 suffixes which are used to distinguish between devices
> with 10/100 Mbit (Internal PHY) or 10/100/1000 Gbit (External PHY) NIC
> configurations; which is important to get correct else the box will have
> no connectivity. I'm not a big fan of the suffixes, but earlier versions
> where I used -int/-ext and -mbit/-gbit resulted in users having no idea
> what the difference was. I'd like to informally establish a convention for
> this naming before doing similar things with some S905X2 devices.

I have no opinion for -100/-1000, -int/-ext, -mbit/-gbit or <nothing>/-gigabit or whatever.

I'll wait for further comments from other reviewers here !

Neil

> 
> NB: At the current time the Realtek 8822CS and MT7668 WiFi/BT chips we
> have seen on 'AIR' devices are not supported in the kernel so these are
> deliberately ommitted. The H96-Max uses a conventional Broadcom module
> so has more complete support. I'm also still exploring / learning about
> alsa userspace configuration so for now the boxes have simple HDMI audio
> support; wiring up the Headphone socket will be done at a later date.
> 
> Christian Hewitt (9):
>   arm64: dts: meson: add common SM1 ac2xx dtsi
>   dt-bindings: arm: amlogic: add X96-AIR bindings
>   arm64: dts: meson: add initial device-trees for X96-AIR
>   dt-bindings: vendor-prefixes: add cyx prefix
>   dt-bindings: arm: amlogic: add A95XF3-AIR bindings
>   arm64: dts: meson: add initial device-trees for A95XF3-AIR
>   dt-bindings: vendor-prefixes: add haochuangyi prefix
>   dt-bindings: arm: amlogic: add H96-Max bindings
>   arm64: dts: meson: add initial device-tree for H96-Max
> 
>  .../devicetree/bindings/arm/amlogic.yaml      |   5 +
>  .../devicetree/bindings/vendor-prefixes.yaml  |   4 +
>  arch/arm64/boot/dts/amlogic/Makefile          |   5 +
>  .../dts/amlogic/meson-sm1-a95xf3-air-100.dts  | 108 +++++++
>  .../dts/amlogic/meson-sm1-a95xf3-air-1000.dts | 129 ++++++++
>  .../boot/dts/amlogic/meson-sm1-ac2xx.dtsi     | 300 ++++++++++++++++++
>  .../boot/dts/amlogic/meson-sm1-h96-max.dts    | 145 +++++++++
>  .../dts/amlogic/meson-sm1-x96-air-100.dts     | 112 +++++++
>  .../dts/amlogic/meson-sm1-x96-air-1000.dts    | 133 ++++++++
>  9 files changed, 941 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-a95xf3-air-100.dts
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-a95xf3-air-1000.dts
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-ac2xx.dtsi
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-h96-max.dts
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-x96-air-100.dts
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-sm1-x96-air-1000.dts
>