linux-kernel - Re: [PATCH v2 4/4] arm64: dts: add support for A1 based Amlogic AD401

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Date:   Fri, 6 Sep 2019 13:59:05 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Carlo Caione <carlo@...one.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Jian Hu <jian.hu@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Xingyu Chen <xingyu.chen@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Tao Zeng <tao.zeng@...ogic.com>
Subject: Re: [PATCH v2 4/4] arm64: dts: add support for A1 based Amlogic AD401

Hi Martin,

Thanks for the review, we really appreciate your time.
Please see my comments below.

On 2019/9/6 4:15, Martin Blumenstingl wrote:
> Hi Jianxin,
> 
> (it's great to see that you and your team are upstreaming this early)
> 
> On Thu, Sep 5, 2019 at 9:08 AM Jianxin Pan <jianxin.pan@...ogic.com> wrote:
> [...]
>> +       memory@0 {
>> +               device_type = "memory";
>> +               reg = <0x0 0x0 0x0 0x8000000>;
>> +               /*linux,usable-memory = <0x0 0x0 0x0 0x8000000>;*/
> why do we need that comment here (I don't understand it - why doesn't
> the "reg" property cover this)?
> I replaced "linux,usable-memory" with reg, but forgot to remove this comment line. 
I will remove this line in the next version. Thank you.
>> +       };
>> +};
>> +
>> +&uart_AO_B {
>> +       status = "okay";
>> +};
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> new file mode 100644
>> index 00000000..4d476ac
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> @@ -0,0 +1,122 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
>> + */
>> +
>> +#include <dt-bindings/interrupt-controller/irq.h>
>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +/ {
>> +       compatible = "amlogic,a1";
>> +
>> +       interrupt-parent = <&gic>;
>> +       #address-cells = <2>;
>> +       #size-cells = <2>;
>> +
>> +       cpus {
>> +               #address-cells = <0x2>;
>> +               #size-cells = <0x0>;
> only now I notice that all our other .dtsi also use hex values
> (instead of decimal as just a few lines above) here
> do you know if there is a particular reason for this?
> 
I just copied from the previous series, and didn't notice the difference before.> [...]
>> +               uart_AO_B: serial@...02000 {
>> +                       compatible = "amlogic,meson-gx-uart",
>> +                                    "amlogic,meson-ao-uart";
>> +                                    reg = <0x0 0xfe002000 0x0 0x18>;
> the indentation of the "reg" property is off here
OK, I will fix it.
> 
> also I'm a bit surprised to see no busses (like aobus, cbus, periphs, ...) here
> aren't there any busses defined in the A1 SoC implementation or are
> were you planning to add them later?
>Unlike previous series,there is no Cortex-M3 AO CPU in A1, and there is no AO/EE power domain.
Most of the registers are on the apb_32b bus.  aobus, cbus and periphs are not used in A1.
> 
> Martin
> 
> .
>