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

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Message-ID: <f06ab4c9-4b86-3b6f-062d-b5fe365bcd10@amlogic.com>
Date:   Tue, 3 Sep 2019 16:16:57 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>
CC:     Rob Herring <robh+dt@...nel.org>, Carlo Caione <carlo@...one.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.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 4/4] arm64: dts: add support for A1 based Amlogic AD401

Hi Neil,

Thanks for your time.
Please see my comments below.

On 2019/9/3 15:42, Neil Armstrong wrote:
> Hi,
> 
> On 03/09/2019 08:51, Jianxin Pan wrote:
>> Add basic support for the Amlogic A1 based Amlogic AD401 board:
>> which describe components as follows: Reserve Memory, CPU, GIC, IRQ,
[...]
>> +	chosen {
>> +		stdout-path = "serial0:115200n8";
>> +	};
>> +	memory@0 {
>> +		device_type = "memory";
>> +		linux,usable-memory = <0x0 0x0 0x0 0x8000000>;
> 
> I'll prefer usage of reg, it's handled the same but linux,usable-memory
> is not documented.
> 
OK, I will fix it in the next version. Thanks for your review.
>> +	};
>> +};
>> +
>> +&uart_AO_B {
>> +	status = "okay";
>> +	/*pinctrl-0 = <&uart_ao_a_pins>;*/
>> +	/*pinctrl-names = "default";*/
> 
> Please remove these lines instead of commenting them.
> 
OK, I will fix it in the next version.
>> +};
>> 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..b98d648
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
>> @@ -0,0 +1,121 @@
>> +// 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>
>> +
>> +/ {
[...]
>> +
>> +	reserved-memory {
>> +		#address-cells = <2>;
>> +		#size-cells = <2>;
>> +		ranges;
> 
> Isn't there secmon reserved memory ?
> 
A1 uses internal SRAM as secmon memory.
And there is no secmon reserved memory in ddr side.
>> +
>> +		linux,cma {
>> +			compatible = "shared-dma-pool";
>> +			reusable;
>> +			size = <0x0 0x800000>;
[...]
>>
> 
> Thanks,
> Neil
> 
> .
>