linux-kernel - Re: [PATCH 3/3] arm64: dts: nuvoton: Add initial support for MA35D1

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Message-ID: <CAK8P3a034bvYcD81h-jo92PbQwDDapa8JvS140fsBhaP7qrFXw@mail.gmail.com>
Date:   Wed, 6 Apr 2022 11:40:44 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jacky Huang <ychuang3@...oton.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>, "olof@...om.net" <olof@...om.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "soc@...nel.org" <soc@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/3] arm64: dts: nuvoton: Add initial support for MA35D1

On Wed, Apr 6, 2022 at 11:25 AM Jacky Huang <ychuang3@...oton.com> wrote:
> On 2022/4/6 下午 03:14, Krzysztof Kozlowski wrote:
> > On 06/04/2022 04:58, Jacky Huang wrote:
> >> config ARCH_MA35D1
> >>       bool "Nuvoton MA35D1 SOC Family"
> > We do not add options for specific SoCs, but for entire families, so
> > ARCH_NUVOTON is correct.
>
> Yes, I would like to modify it as the following:
>
> config ARCH_NUVOTON
>      bool "Nuvoton SoC Family"
>      select PINCTRL
>      select PINCTRL_MA35D1
>      select PM
>      select GPIOLIB
>      select SOC_BUS
>      help
>        This enables support for Nuvoton MA35D1 ARMv8 SoC.
>
> (Currently, we have MA35D1 only in the support list for arm64 SoC.).

You could reword this to "This enables support for Nuvoton ARMv8 SoCs
such as the MA35D1", to prevent this from getting stale, or repeatedly
updated when future SoCs are added.

Another change you can consider is to remove the 'select PINCTRL_MA35D1'
here and instead change the pinctrl Kconfig entry to

config PINCTRL_MA35D1
           bool "..."
           depends on ARCH_NUVOTON || COMPILE_TEST
           default ARCH_NUVOTON

That way you get it default-enabled when ARCH_NUVOTON is
turned on, or disabled in configurations without ARCH_NUVOTON,
but can make a more fine-grained selection for a particular SoC
if you get more than one such driver in the future.

        Arnd