On 4/12/2023 1:51 PM, Krzysztof Kozlowski wrote:
On 07/04/2023 16:04, Souradeep Chowdhury wrote:
All of Qualcomm's proprietary Android boot-loaders capture boot time
stats, like the time when the bootloader started execution and at what
point the bootloader handed over control to the kernel etc. in the IMEM
region. This information is captured in a specific format by this driver
by mapping a structure to the IMEM memory region and then accessing the
members of the structure to print the information. This information is
useful in verifying if the existing boot KPIs have regressed or not.
A sample log in SM8450(waipio) device is as follows:-
+
+static int boot_stats_probe(struct platform_device *pdev)
+{
+ struct device_node *np_mpm2;
+ struct device *boot_stat = &pdev->dev;
+
+ boot_stats = of_iomap(boot_stat->of_node->child, 0);
+ if (!boot_stats)
+ return dev_err_probe(&pdev->dev, -ENOMEM,
+ "failed to map imem region\n");
+
+ np_mpm2 = of_find_compatible_node(NULL, NULL,
+ "qcom,mpm2-sleep-counter");
This is undocumented and non-existing compatible. No, we cannot take this.
Also, referencing other nodes should be with phandles, not compatibles.
Ack. This will be dropped in the next version as we are not printing the
current kernel timestamp.
Best regards,
Krzysztof
