OPPs can be populated statically, via DT, or added at run time with dev_pm_opp_add().
While this driver handles the first case correctly, it would fail to populate OPPs added at runtime. Because call to of_init_opp_table() would fail as there are no OPPs in DT and probe will return early.
To fix this, remove error checking and call dev_pm_opp_init_cpufreq_table() unconditionally.
Update bindings as well.
Acked-by: Santosh Shilimkar santosh.shilimkar@ti.com Suggested-by: Stephen Boyd sboyd@codeaurora.org Tested-by: Stephen Boyd sboyd@codeaurora.org Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- Hi Rafael,
This was earlier sent as part of: https://lkml.org/lkml/2014/7/1/358 series. But actually is an fix and can (should?) be pushed for 3.16.
Rest of the patches from that series are cleanups/updates and so can go in 3.17.
Please see if you can take it for 3.16.
Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt | 6 ++++-- drivers/cpufreq/cpufreq-cpu0.c | 7 ++----- 2 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt index f055515..366690c 100644 --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt @@ -8,10 +8,12 @@ Both required and optional properties listed below must be defined under node /cpus/cpu@0.
Required properties: -- operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt - for details +- None
Optional properties: +- operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt for + details. OPPs *must* be supplied either via DT, i.e. this property, or + populated at runtime. - clock-latency: Specify the possible maximum transition latency for clock, in unit of nanoseconds. - voltage-tolerance: Specify the CPU voltage tolerance in percentage. diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c index ee1ae30..86beda9 100644 --- a/drivers/cpufreq/cpufreq-cpu0.c +++ b/drivers/cpufreq/cpufreq-cpu0.c @@ -152,11 +152,8 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev) goto out_put_reg; }
- ret = of_init_opp_table(cpu_dev); - if (ret) { - pr_err("failed to init OPP table: %d\n", ret); - goto out_put_clk; - } + /* OPPs might be populated at runtime, don't check for error here */ + of_init_opp_table(cpu_dev);
ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); if (ret) {