linux-kernel - Re: [PATCH v7 1/4] dt-bindings: soc: sophgo: Add Sophgo system control module

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <60abfdcc-3d61-4df1-b77b-23d4a5d26a46@linaro.org>
Date: Tue, 9 Jan 2024 09:56:51 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Chen Wang <unicorn_wang@...look.com>, Chen Wang <unicornxw@...il.com>,
 aou@...s.berkeley.edu, chao.wei@...hgo.com, conor@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, mturquette@...libre.com,
 palmer@...belt.com, paul.walmsley@...ive.com, richardcochran@...il.com,
 robh+dt@...nel.org, sboyd@...nel.org, devicetree@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, haijiao.liu@...hgo.com,
 xiaoguang.xing@...hgo.com, guoren@...nel.org, jszhang@...nel.org,
 inochiama@...look.com, samuel.holland@...ive.com
Subject: Re: [PATCH v7 1/4] dt-bindings: soc: sophgo: Add Sophgo system
 control module

On 09/01/2024 09:52, Chen Wang wrote:
> 
> On 2024/1/9 3:36, Krzysztof Kozlowski wrote:
>> On 08/01/2024 08:20, Chen Wang wrote:
>>> On 2024/1/8 15:03, Krzysztof Kozlowski wrote:
>>>> On 08/01/2024 07:48, Chen Wang wrote:
>>>>> From: Chen Wang <unicorn_wang@...look.com>
>>>>>
>>>>> Add documentation to describe Sophgo System Controller for SG2042.
>>>>>
>>>>> Signed-off-by: Chen Wang <unicorn_wang@...look.com>
>>>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>>> ---
>>>>>    .../soc/sophgo/sophgo,sg2042-sysctrl.yaml     | 34 +++++++++++++++++++
>>>>>    1 file changed, 34 insertions(+)
>>>>>    create mode 100644 Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-sysctrl.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-sysctrl.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-sysctrl.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..1ec1eaa55598
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-sysctrl.yaml
>>>>> @@ -0,0 +1,34 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/soc/sophgo/sophgo,sg2042-sysctrl.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: Sophgo SG2042 SoC system controller
>>>>> +
>>>>> +maintainers:
>>>>> +  - Chen Wang <unicorn_wang@...look.com>
>>>>> +
>>>>> +description:
>>>>> +  The Sophgo SG2042 SoC system controller provides register information such
>>>>> +  as offset, mask and shift that can be used by other modules, such as clocks.
>>>> "offset, mask and shift" is not a register information stored in
>>>> syscons. Are you really sure, that your system controller hardware
>>>> stores offsets of some other registers?
>>>>
>>>> Show as some example of such offsets, masks and shifts provided by this
>>>> hardware.
>>> The system control module is defined here:
>>> https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/system-control.rst.
>>> It contains some registers related to pll and gates.
>> I do not see there registers providing shifts and offsets... just values.
>>
>>> Some other clocks registars are defined in
>>> https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/clock.rst.
>>>
>>> memory-map is defined in
>>> https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/mmap.rst
>>
>> Please fix the wording because it does not make sense. System controller
>> does not provide register information. Your datasheet provides register
>> information.
> 
> Could it be that what I said "that can be used by other modules, such as 

modules as Linux modules should not be involved in this description.

> clocks." may cause misunderstanding. I plan to change it to "The Sophgo 
> SG2042 SoC system controller provides register information such as 
> offset, mask and shift to configure related modules such as clock." Is 
> this better?
> 

Still does not make sense. To provide "offset" means that some other
hardware reads sophgo module to get the value of offset. That's not the
case here.

Best regards,
Krzysztof