linux-kernel - Re: [PATCH v1 0/3] Meson A1 32-bit support

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Message-ID: <8e5f9bfa-d612-cd43-d722-d04c40938c62@linaro.org>
Date:   Mon, 27 Feb 2023 09:15:04 +0100
From:   neil.armstrong@...aro.org
To:     Alexey Romanov <avromanov@...rdevices.ru>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, khilman@...libre.com,
        jbrunet@...libre.com, martin.blumenstingl@...glemail.com,
        linus.walleij@...aro.org
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru
Subject: Re: [PATCH v1 0/3] Meson A1 32-bit support

On 22/02/2023 12:50, Alexey Romanov wrote:
> Hello!
> 
> This patchset adds support for 32-bit Meson A1 board.

Hi Alexev,

I'm aware Amlogic also runs their kernel as 32bit to gain a few kbytes
of memory, but those processors are ARMv8 and the arm64 arch code
has been designed for those CPUs.

So far I didn't find a single good reason to add 32bit support for
ARMv8 Amlogic based SoCs, if you have a solid reason please share.

And as Krzysztof stated, the support is incomplete and cannot work
without a dts file.

Neil

> We describe device tree with following components:
> CPU, GIC, IRQ, Timer, UART, PIN controller.
> It's capable of booting up into the serial console.
> 
> We have tested this DTS and used drivers at our
> 32-bit Meson A1 board and it works correctly.
> 
> Alexey Romanov (3):
>    meson: pinctrl: use CONFIG_PINCTRL_A1 with CONFIG_ARM
>    firmware: meson: use CONFIG_MESON_SM with CONFIG_ARM
>    arch/arm: dts: introduce meson-a1 device tree
> 
>   arch/arm/boot/dts/meson-a1.dtsi | 151 ++++++++++++++++++++++++++++++++
>   drivers/firmware/meson/Kconfig  |   2 +-
>   drivers/pinctrl/meson/Kconfig   |   2 +-
>   3 files changed, 153 insertions(+), 2 deletions(-)
>   create mode 100644 arch/arm/boot/dts/meson-a1.dtsi
>