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

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Date:   Wed, 6 Apr 2022 17:25:42 +0800
From:   Jacky Huang <ychuang3@...oton.com>
To:     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>
CC:     "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 2022/4/6 下午 03:14, Krzysztof Kozlowski wrote:
> On 06/04/2022 04:58, Jacky Huang wrote:
>>>> diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
>>>> index 639e01a4d855..28e01442094f 100644
>>>> --- a/arch/arm64/boot/dts/Makefile
>>>> +++ b/arch/arm64/boot/dts/Makefile
>>>> @@ -30,3 +30,4 @@ subdir-y += synaptics
>>>>    subdir-y += ti
>>>>    subdir-y += toshiba
>>>>    subdir-y += xilinx
>>>> +subdir-y += nuvoton
>>>> diff --git a/arch/arm64/boot/dts/nuvoton/Makefile b/arch/arm64/boot/dts/nuvoton/Makefile
>>>> new file mode 100644
>>>> index 000000000000..e1e0c466bf5e
>>>> --- /dev/null
>>>> +++ b/arch/arm64/boot/dts/nuvoton/Makefile
>>>> @@ -0,0 +1,2 @@
>>>> +# SPDX-License-Identifier: GPL-2.0
>>>> +dtb-$(CONFIG_ARCH_NUVOTON) += ma35d1-evb.dtb
>>> ARCH_NUVOTON does not exist.
>> I would add the following to end of arch/arm64/Kconfig.platforms,
> Don't add things at the end of files but rather in respective place
> without messing the order.

OK, I will put it to the right place in alphanumeric order.
It should be between ARCH_MXC and ARCH_QCOM.

>
>> and
>> add the
>> modification to this patch series.
>>
>> 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.).

>>       select PINCTRL
>>       select PINCTRL_MA35D1
>>       select PM
>>       select GPIOLIB
>>       select SOC_BUS
>>       select VIDEOMODE_HELPERS
>>       select FB_MODE_HELPERS
>>       help
>>         This enables support for Nuvoton MA35D1 SOC Family.
>>
>>
>>>> diff --git a/arch/arm64/boot/dts/nuvoton/ma35d1-evb.dts b/arch/arm64/boot/dts/nuvoton/ma35d1-evb.dts
>>>> new file mode 100644
>>>> index 000000000000..38e4f734da0f
>>>> --- /dev/null
>>>> +++ b/arch/arm64/boot/dts/nuvoton/ma35d1-evb.dts
>>>> @@ -0,0 +1,23 @@
>>>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>>>> +/*
>>>> + * Device Tree Source for MA35D1 Evaluation Board (EVB)
>>>> + *
>>>> + * Copyright (C) 2021 Nuvoton Technology Corp.
>>>> + */
>>>> +
>>>> +/dts-v1/;
>>>> +#include "ma35d1.dtsi"
>>>> +
>>>> +/ {
>>>> +       model = "Nuvoton MA35D1-EVB";
>>>> +
>>>> +       chosen {
>>>> +               bootargs = "console=ttyS0,115200n8";
>>> No bootargs. "chosen", please.
>> OK, I would modify it as:
>>
>> chosen {
>>           stdout-path = "serial0:115200n8";
>>       };
>>
>>
>>>> +       };
>>> You need compatible and bindings.
>> I will add the compatible here
>> compatible = "nuvoton,ma35d1-evb", "nuvoton,ma35d1"
>>
>> And, I should create a new binding file
>> Documentation/devicetree/bindings/arm/nuvoton.yaml to this patch series.
>> And the property would be:
>>
>> properties:
>>     compatible:
>>       description: Nuvoton MA35D1-EVB
>>       items:
>>         - const: nuvoton,ma35d1-evb
>>         - const: nuvoton,ma35d1
>>
>>
>> Is it OK?
> Yes
>
>
>
> Best regards,
> Krzysztof

Thanks for your review.

Sincerely,
Jacky