Re: [PATCH v6 51/52] PM / devfreq: tegra30: Support interconnect and OPPs from device-tree

Chanwoo Choi
2020-11-01T15:58:37Z

On Mon, Nov 2, 2020 at 12:49 AM Dmitry Osipenko <digetx@gmail.com> wrote:
>
> 01.11.2020 18:44, Chanwoo Choi пишет:
> >> OPP core will try to grab the clock reference for the table and it may
> >> cause EPROBE_DEFER. Although, it shouldn't happen here because we have
> >> devm_clk_get() before the get_opp_table(), hence seems the deferred
> >> probe indeed shouldn't happen in this case.
> > It is my missing point. If there, you're right.
> > Could you provide the code point to check the clock reference on the OPP core?
>
> Please see it here:
>
> https://elixir.bootlin.com/linux/v5.10-rc1/source/drivers/opp/core.c#L1101

Thanks. It seems that if device tree node contains the any node,
it is not EPROBE_DEFER because of just using "clk_get(dev, NULL)".

The patch[1] used the 'dev_err_probe' for getting the "emc" clock.
Do you need to check it more?

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git/commit/?h=devfreq-next&id=09d56d92ad25b58113f4ec677e9b1ac1e2c3072b

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Best Regards,
Chanwoo Choi