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Subject: Re: [PATCH v3 1/4] dt-bindings: power: add Amlogic secure power
 domains bindings
To:     Rob Herring <robh@kernel.org>
CC:     Kevin Hilman <khilman@baylibre.com>,
        <linux-amlogic@lists.infradead.org>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>, Jian Hu <jian.hu@amlogic.com>,
        Hanjie Lin <hanjie.lin@amlogic.com>,
        Victor Wan <victor.wan@amlogic.com>,
        Xingyu Chen <xingyu.chen@amlogic.com>
References: <1571391167-79679-1-git-send-email-jianxin.pan@amlogic.com>
 <1571391167-79679-2-git-send-email-jianxin.pan@amlogic.com>
 <20191029020125.GA11182@bogus>
From:   Jianxin Pan <jianxin.pan@amlogic.com>
Message-ID: <07f0ed9d-0b1a-d84f-de8b-1967e56bbd21@amlogic.com>
Date:   Tue, 29 Oct 2019 20:09:39 +0800
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Hi Jerome,

Could you give some advice about this?

In a1/c1, watchdog and powerdomain are the same, they use secure monitor [0] and
there is no share memory needed.

[0]
https://lore.kernel.org/linux-amlogic/20190731082339.20163-1-ccaione@baylibre.com/

On 2019/10/29 10:01, Rob Herring wrote:
> On Fri, Oct 18, 2019 at 05:32:44PM +0800, Jianxin Pan wrote:
>> Add the bindings for the Amlogic Secure power domains, controlling the
>> secure power domains.
>>
>> The bindings targets the Amlogic A1 and C1 compatible SoCs, in which the
>> power domain registers are in secure world.
>>
>> Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
>> ---
>>  .../bindings/power/amlogic,meson-sec-pwrc.yaml     | 42 ++++++++++++++++++++++
>>  include/dt-bindings/power/meson-a1-power.h         | 32 +++++++++++++++++
>>  2 files changed, 74 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/amlogic,meson-sec-pwrc.yaml
>>  create mode 100644 include/dt-bindings/power/meson-a1-power.h
>>
>> diff --git a/Documentation/devicetree/bindings/power/amlogic,meson-sec-pwrc.yaml b/Documentation/devicetree/bindings/power/amlogic,meson-sec-pwrc.yaml
>> new file mode 100644
>> index 00000000..88d8261
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/amlogic,meson-sec-pwrc.yaml
>> @@ -0,0 +1,42 @@
>> +# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +# Copyright (c) 2019 Amlogic, Inc
>> +# Author: Jianxin Pan <jianxin.pan@amlogic.com>
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/power/amlogic,meson-sec-pwrc.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Amlogic Meson Secure Power Domains
>> +
>> +maintainers:
>> +  - Jianxin Pan <jianxin.pan@amlogic.com>
>> +
>> +description: |+
>> +  Meson Secure Power Domains used in A1/C1 SoCs.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - amlogic,meson-a1-pwrc
>> +
>> +  "#power-domain-cells":
>> +    const: 1
>> +
>> +  secure-monitor:
>> +    description: phandle to the secure-monitor node
>> +    $ref: /schemas/types.yaml#/definitions/phandle
> 
> Like the watchdog, make this a child or the secure firmware node. Or 
> just add '#power-domain-cells' to it. You don't really need a child node 
> here if there's not other resources in DT for this.
> 
> Rob
> 
> .
>