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Subject: Re: [PATCH v9 6/9] docs: misc-devices: (smpro-misc) Add documentation Content-Language: en-CA To: Greg Kroah-Hartman Cc: macro@orcam.me.uk, Lee Jones , Bagas Sanjaya , Rob Herring , Krzysztof Kozlowski , Jean Delvare , Guenter Roeck , Jonathan Corbet , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Thu Nguyen , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, OpenBMC Maillist , Open Source Submission , Phong Vo , thang@os.amperecomputing.com References: <20220929094321.770125-1-quan@os.amperecomputing.com> <20220929094321.770125-7-quan@os.amperecomputing.com> From: Quan Nguyen In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SI1PR02CA0046.apcprd02.prod.outlook.com (2603:1096:4:1f5::14) To SJ0PR01MB7282.prod.exchangelabs.com (2603:10b6:a03:3f2::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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686KyH69KKEf7/v0XKqPxQXBQLLXHRxRCKcIMg6o0qggjRohksF9L/WIbOrWtyqn6dKRw73+/4Tcvn5fUj/8hqSgGthgNZlGHAgSEC3t5Mo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR01MB5796 X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,NICE_REPLY_A,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 >> Signed-off-by: Quan Nguyen >> --- >> 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 >> + >> +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:: >> + >> + >> + >> +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