Re: [PATCH V2 2/3] soc: qcom: boot_stat: Add Driver Support for Boot Stats

[Krzysztof Kozlowski]

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