linux-kernel - Re: [PATCH v3 02/11] dt-bindings: remoteproc: mediatek: Support MT8195 dual-core SCP

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Message-ID: <d16002714baf1eccb9b0ef5a2ae60e9b25194701.camel@mediatek.com>
Date:   Wed, 28 Sep 2022 09:17:57 +0000
From:   TingHan Shen (沈廷翰) 
        <TingHan.Shen@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Tiffany Lin (林慧珊) 
        <tiffany.lin@...iatek.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        Yunfei Dong (董云飞) 
        <Yunfei.Dong@...iatek.com>,
        "peng.fan@....nxp.com" <peng.fan@....nxp.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "andersson@...nel.org" <andersson@...nel.org>,
        Andrew-CT Chen (陳智迪) 
        <Andrew-CT.Chen@...iatek.com>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>
CC:     "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 02/11] dt-bindings: remoteproc: mediatek: Support
 MT8195 dual-core SCP

On Wed, 2022-09-28 at 15:01 +0800, Peng Fan wrote:
> 
> On 9/27/2022 10:55 AM, Tinghan Shen wrote:
> > The MT8195 SCP is a dual-core RISC-V MCU. Extend the yaml file
> > to describe the 2nd core as a subnode of the boot core.
> > 
> > The configuration register is shared by MT8195 SCP core 0
> > and core 1. The core 1 can retrieve the information of configuration
> > registers from parent node.
> 
> I think the commit message would not convince people you put
> scp 1 as subnode of scp 0.
> 
> Regards,
> Peng.
> 
Hi Peng,

Thanks for your review. I should give the most reasonable explanation
for why SCP 1 is a subnode.

Adding SCP 1 as a subnode helps to assure finish probing SCP 1
before starting SCP 0 by using of_platform_populate. It's because
that I want to probe SCP 1 as a remoteproc subdevice of SCP 0.
such that when SCP 0 crashed, SCP 0 can reboot SCP 1.

Regards,
TingHan