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cpufreq: cpu0: OPPs can be populated at runtime 

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.

Suggested-by: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2014-07-11 20:24:19 +05:30 committed by Rafael J. Wysocki
parent 2fa1adc070
commit 1bf8cc3d01
2 changed files with 6 additions and 7 deletions
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6
Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt
View File

@ -8,10 +8,12 @@ Both required and optional properties listed below must be defined
under node /cpus/cpu@0. under node /cpus/cpu@0.
Required properties: Required properties:
- operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt - None
for details
Optional properties: 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, - clock-latency: Specify the possible maximum transition latency for clock,
in unit of nanoseconds. in unit of nanoseconds.
- voltage-tolerance: Specify the CPU voltage tolerance in percentage. - voltage-tolerance: Specify the CPU voltage tolerance in percentage.

7
drivers/cpufreq/cpufreq-cpu0.c
View File

@ -152,11 +152,8 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
goto out_put_reg; goto out_put_reg;
} }
ret = of_init_opp_table(cpu_dev); /* OPPs might be populated at runtime, don't check for error here */
if (ret) { of_init_opp_table(cpu_dev);
pr_err("failed to init OPP table: %d\n", ret);
goto out_put_clk;
}
ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
if (ret) { if (ret) {