linux-kernel - Re: [PATCH v4 4/4] dt-bindings: syscon: Add StarFive syscon doc

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Message-ID: <f8d2b665-ce5d-81f8-8c55-81f1a4cb62b9@starfivetech.com>
Date:   Tue, 28 Feb 2023 17:05:46 +0800
From:   William Qiu <william.qiu@...rfivetech.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] dt-bindings: syscon: Add StarFive syscon doc



On 2023/2/28 6:29, Rob Herring wrote:
> On Tue, Feb 21, 2023 at 10:44:02AM +0800, William Qiu wrote:
>> 
>> 
>> On 2023/2/21 7:43, Rob Herring wrote:
>> > On Wed, Feb 15, 2023 at 07:32:49PM +0800, William Qiu wrote:
>> >> Add documentation to describe StarFive System Controller Registers.
>> >> 
>> >> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
>> >> ---
>> >>  .../bindings/soc/starfive/jh7110-syscon.yaml  | 51 +++++++++++++++++++
>> >>  MAINTAINERS                                   |  5 ++
>> >>  2 files changed, 56 insertions(+)
>> >>  create mode 100644 Documentation/devicetree/bindings/soc/starfive/jh7110-syscon.yaml
>> >> 
>> >> diff --git a/Documentation/devicetree/bindings/soc/starfive/jh7110-syscon.yaml b/Documentation/devicetree/bindings/soc/starfive/jh7110-syscon.yaml
>> >> new file mode 100644
>> >> index 000000000000..fa4d8522a454
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/soc/starfive/jh7110-syscon.yaml
>> >> @@ -0,0 +1,51 @@
>> >> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> >> +%YAML 1.2
>> >> +---
>> >> +$id: http://devicetree.org/schemas/soc/starfive/jh7110-syscon.yaml#
>> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> >> +
>> >> +title: StarFive JH7110 SoC system controller
>> >> +
>> >> +maintainers:
>> >> +  - William Qiu <william.qiu@...rfivetech.com>
>> >> +
>> >> +description: |
>> >> +  The StarFive JH7110 SoC system controller provides register information such
>> >> +  as offset, mask and shift to configure related modules such as MMC and PCIe.
>> >> +
>> >> +properties:
>> >> +  compatible:
>> >> +    items:
>> >> +      - enum:
>> >> +          - starfive,jh7110-stg-syscon
>> >> +          - starfive,jh7110-sys-syscon
>> >> +          - starfive,jh7110-aon-syscon
>> > 
>> > Is 'syscon' really part of what the blocks are called? Is just 'stg', 
>> > 'sys' and 'aon' not unique enough?
>> > 
>> > Rob
>> Hi Rob,
>> 
>> In StarFive SoC, we do have syscrg/aoncrg/stgcrg, which is uesd to be the clock
>> controller, so 'syscon' is added to avoid confusion.
> 
> You've only added to my confusion. 'syscrg' and 'sys-syscon' are 2 
> different h/w blocks and unrelated to each other? Or 'syscrg' is the 
> clock portion of 'sys-syscon'? In that case, 'syscrg' should be a child 
> of 'sys-syscon' or possibly just all one node. Please provide details on 
> the entire h/w block so we can provide better input on the bindings.
> 
> Rob

Hi Rob,

It's my description that's problematic.'syscon' here refers to the hardware module
inside our JH7110, which is different from the syscon interface in linux. The syscon
I added now uses the syscon interface of linux to read and write the syscon register
in our JH7110. So we decided to name it that way.

Best regards
William