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cpufreq: qoriq: enhance bus frequency calculation 

On some platforms, property device-type may be missed in soc node
in dts which caused the bus-frequency can not be obtained correctly.

This patch enhanced the bus-frequency calculation. When property
device-type is missed in dts, bus-frequency will be obtained by
looking up clock table to get platform clock and hence get its
frequency.

Signed-off-by: Tang Yuantian <andy.tang@nxp.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
YuanTian Tang 2017-03-10 09:28:43 +08:00 committed by Rafael J. Wysocki
parent cf9a243825
commit b51d3388e2
1 changed files with 17 additions and 7 deletions
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24
drivers/cpufreq/qoriq-cpufreq.c
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@ -52,17 +52,27 @@ static u32 get_bus_freq(void)
{
struct device_node *soc;
u32 sysfreq;
struct clk *pltclk;
int ret;
/* get platform freq by searching bus-frequency property */
soc = of_find_node_by_type(NULL, "soc");
if (!soc)
return 0;
if (soc) {
ret = of_property_read_u32(soc, "bus-frequency", &sysfreq);
of_node_put(soc);
if (!ret)
return sysfreq;
}
if (of_property_read_u32(soc, "bus-frequency", &sysfreq))
sysfreq = 0;
/* get platform freq by its clock name */
pltclk = clk_get(NULL, "cg-pll0-div1");
if (IS_ERR(pltclk)) {
pr_err("%s: can't get bus frequency %ld\n",
__func__, PTR_ERR(pltclk));
return PTR_ERR(pltclk);
}
of_node_put(soc);
return sysfreq;
return clk_get_rate(pltclk);
}
static struct clk *cpu_to_clk(int cpu)