Re: [PATCH v2 2/6] firmware: ti_sci: Partial-IO support

Nishanth Menon
2024-07-30T15:08:13Z

On 15:01-20240730, Markus Schneider-Pargmann wrote:
> > > +
> > > + return NOTIFY_DONE;
> > > +}
> > > +
> > > /* Description for K2G */
> > > static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
> > > .default_host_id = 2,
> > > @@ -3398,6 +3485,35 @@ static int ti_sci_probe(struct platform_device *pdev)
> > > goto out;
> > > }
> > >
> > > + if (of_property_read_bool(dev->of_node, "ti,partial-io-wakeup-sources")) {
> >
> > You should probably check on TISCI_MSG_QUERY_FW_CAPS[1] if
> > Partial IO on low power mode is supported as well? if there is a
> > mismatch, report so?
>
> I actually have another series in my queue that introduces this check. I
> just implemented this check for Partial-IO yesterday in the patch that
> introduces fw capabilities. If you like I can switch these series
> around.

Yes, please introduce it part of the series.

>
> >
> > > + info->nr_wakeup_sources =
> > > + of_count_phandle_with_args(dev->of_node,
> > > + "ti,partial-io-wakeup-sources",
> > > + NULL);
> > > + info->wakeup_source_nodes =
> > > + devm_kzalloc(dev, sizeof(*info->wakeup_source_nodes),
> > > + GFP_KERNEL);
> > > +
> > > + for (i = 0; i != info->nr_wakeup_sources; ++i) {
> > > + struct device_node *devnode =
> > > + of_parse_phandle(dev->of_node,
> > > + "ti,partial-io-wakeup-sources",
> > > + i);
> > > + info->wakeup_source_nodes[i] = devnode;
> >
> > Curious: Don't we need to maintain reference counting for the devnode
> > if CONFIG_OF_DYNAMIC?
>
> In case you mean I missed of_node_put(), yes, I did, thank you. I added
> it in a ti_sci_remove().

And unless I am mistaken, of_node_get as required as you are
retaining the reference of the node till shutdown / remove is invoked.

--
Regards,
Nishanth Menon
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