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opp: of: Allow empty opp-table with opp-shared 

The opp binding now allows to have an empty opp table and shared-opp to
still describe that devices share v/f lines.

When initialising an empty opp table, allow such case by:
- treating such conditions with warnings in place of errors
- don't fail on empty table

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Nicola Mazzucato 2020-12-08 17:42:27 +00:00 committed by Viresh Kumar
parent 24b3c963c0
commit 6ee70e8c34
1 changed files with 5 additions and 2 deletions
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7
drivers/opp/of.c
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@ -169,7 +169,8 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
/* Traversing the first OPP node is all we need */
np = of_get_next_available_child(opp_np, NULL);
if (!np) {
dev_err(dev, "Empty OPP table\n");
dev_warn(dev, "Empty OPP table\n");
return;
}
@ -377,7 +378,9 @@ int dev_pm_opp_of_find_icc_paths(struct device *dev,
struct icc_path **paths;
ret = _bandwidth_supported(dev, opp_table);
if (ret <= 0)
if (ret == -EINVAL)
return 0; /* Empty OPP table is a valid corner-case, let's not fail */
else if (ret <= 0)
return ret;
ret = 0;