Subject: Re: [PATCH 2/2] firmware: imx: sm-misc: Print boot/shutdown reasons

From: Peng Fan <[email-masked]>
Date: Thu, 5 Mar 2026 18:22:15 +0800

Hi Alexander,

Thanks for giving a look.

On Thu, Mar 05, 2026 at 08:44:26AM +0100, Alexander Stein wrote:
>Hi,
>
>Am Donnerstag, 5. März 2026, 02:56:45 CET schrieb Peng Fan (OSS):
>> From: Peng Fan <[email-masked]>
>> 
>> Add reset reason string table for i.MX95 and introduce a helper
>> (scmi_imx_misc_get_reason) to query and print both system and LM
>> (Logical Machine) reset reasons via the SCMI MISC protocol.
>> 
>> Signed-off-by: Peng Fan <[email-masked]>
>> ---
[...]
>> +		if (boot.valid)
>> +			dev_info(&sdev->dev, "%s Boot reason: %s, origin: %d, errid: %d\n",
>> +				 system ? "SYS" : "LM", rst[boot.reason],
>> +				 boot.orig_valid ? boot.origin : -1,
>> +				 boot.err_valid ? boot.errid : -1);
>> +		if (shutdown.valid)
>> +			dev_info(&sdev->dev, "%s shutdown reason: %s, origin: %d, errid: %d\n",
>> +				 system ? "SYS" : "LM", rst[shutdown.reason],
>> +				 shutdown.orig_valid ? shutdown.origin : -1,
>> +				 shutdown.err_valid ? shutdown.errid : -1);
>
>Is there a way to query this from userspace programs instead of printing into kernel log?

I not add sysfs or debugfs to get the information in this patchset, since our
customer only want the information could be shown in kernel boot log.

But I could add also sysfs interface to allow userspace get the information if
you need this feature.

Regards,
Peng

>
>Best regards,
>Alexander
>
>> +	} else {
>> +		dev_err(&sdev->dev, "Failed to get lm reset reason: %d\n", ret);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
>>  {
>>  	const struct scmi_handle *handle = sdev->handle;
>> @@ -133,6 +204,8 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
>>  	scmi_imx_dentry = debugfs_create_dir("scmi_imx", NULL);
>>  	debugfs_create_file("syslog", 0444, scmi_imx_dentry, &sdev->dev, &syslog_fops);
>>  
>> +	scmi_imx_misc_get_reason(sdev);
>> +
>>  	return devm_add_action_or_reset(&sdev->dev, scmi_imx_misc_put, scmi_imx_dentry);
>>  }
>>  
>> 
>> 
>
>
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