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SubjectRe: [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation
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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@os.amperecomputing.com>
>> Signed-off-by: Quan Nguyen <quan@os.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@os.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

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