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.
Best regards,
Krzysztof
