linux-kernel - Re: [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation

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Date:   Thu, 6 Oct 2022 14:45:38 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     macro@...am.me.uk, Lee Jones <lee@...nel.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thu Nguyen <thu@...amperecomputing.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        thang@...amperecomputing.com
Subject: Re: [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation



On 29/09/2022 16:56, Greg Kroah-Hartman wrote:
> On Thu, Sep 29, 2022 at 04:43:18PM +0700, Quan Nguyen wrote:
>> Adds documentation for the Ampere(R)'s Altra(R) SMpro misc driver.
>>
>> Signed-off-by: Thu Nguyen <thu@...amperecomputing.com>
>> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
>> ---
>> Changes in v9:
>>    + Update SPDX licence                          [Greg]
>>
>> Changes in v8:
>>    + Update to reflect single value per sysfs     [Quan]
>>
>> Changes in v7:
>>    + None
>>
>> Changes in v6:
>>    + First introduced in v6 [Quan]
>>
>>   Documentation/misc-devices/index.rst      |  1 +
>>   Documentation/misc-devices/smpro-misc.rst | 82 +++++++++++++++++++++++
>>   2 files changed, 83 insertions(+)
>>   create mode 100644 Documentation/misc-devices/smpro-misc.rst
>>
>> diff --git a/Documentation/misc-devices/index.rst b/Documentation/misc-devices/index.rst
>> index b74b3b34a235..b40cd1b402f7 100644
>> --- a/Documentation/misc-devices/index.rst
>> +++ b/Documentation/misc-devices/index.rst
>> @@ -28,6 +28,7 @@ fit into other categories.
>>      oxsemi-tornado
>>      pci-endpoint-test
>>      smpro-errmon
>> +   smpro-misc
>>      spear-pcie-gadget
>>      uacce
>>      xilinx_sdfec
>> diff --git a/Documentation/misc-devices/smpro-misc.rst b/Documentation/misc-devices/smpro-misc.rst
>> new file mode 100644
>> index 000000000000..d21be4a09e69
>> --- /dev/null
>> +++ b/Documentation/misc-devices/smpro-misc.rst
>> @@ -0,0 +1,82 @@
>> +.. SPDX-License-Identifier: GPL-2.0-only
>> +
>> +Kernel driver Ampere(R) Altra(R) SMpro miscellaneous
>> +====================================================
>> +
>> +Supported chips:
>> +
>> +  * Ampere(R) Altra(R)
>> +
>> +    Prefix: 'smpro'
>> +
>> +    Reference: Altra SoC BMC Interface Specification
>> +
>> +Author: Thu Nguyen <thu@...amperecomputing.com>
>> +
>> +Description
>> +-----------
>> +
>> +This driver support the monitoring and configuration of various miscellaneous
>> +data provided by Ampere(R) Altra(R) SMpro processor.
>> +At this time, these include:
>> +
>> +  * Reading Boot Progress information
>> +  * Configuring SoC Power Limit
>> +
>> +Sysfs entries
>> +-------------
>> +
>> +1) Boot progress
>> +
>> +SMpro misc driver creates the sysfs files ``boot_progress``.
>> +The format of ``boot_progress`` file is as below::
>> +
>> +<boot stage><boot status><boot progress>
>> +
>> +Where:
>> +
>> +* Boot stage::
>> +
>> +    0: SMpro firmware booting.
>> +    1: PMpro firmware booting.
>> +    2: ATF BL1 firmware booting.
>> +    3: DDR initialization.
>> +    4: DDR training report status.
>> +    5: ATF BL2 firmware booting.
>> +    6: ATF BL31 firmware booting.
>> +    7: ATF BL32 firmware booting.
>> +    8: UEFI firmware booting.
>> +    9: OS booting.
>> +
>> +* Boot status::
>> +
>> +    0: Not started.
>> +    1: Started.
>> +    2: Complete without error.
>> +    3: Failure.
>> +
>> +* boot progress: 32 bits boot progress code
>> +
>> +The sysfs ``boot_progress`` only reports the boot state when the host is booting.
>> +If the host is already booted, it returns latest state.
>> +
>> +Example::
>> +
>> +    #cat boot_progress
>> +    0102808454A8
>> +
>> +2) SoC Power Limit
>> +
>> +SMpro misc driver creates the sysfs file ``soc_power_limit`` to get/set the SoC Power Limit.
>> +
>> +Reading this sysfs return the current setting of SoC Power Limit (W) in decimal string.
>> +Writing the desired value in decimal string to set the SoC Power Limit in Watt (W).
>> +The range of SoC Power Limit is 90-500(W) and will be ignored if out of range.
>> +
>> +Example::
>> +
>> +    #cat soc_power_limit
>> +    90
>> +    #echo 95 > soc_power_limit
>> +    #cat soc_power_limit
>> +    95
>> -- 
>> 2.35.1
>>
> 
> Why is this file needed at all if you have the correct
> Documentation/ABI/ entries instead?
> 

Will drop this file and add document to both the code and 
Documentation/ABI entries in next version.

-Quan