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>
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@ -52,17 +52,27 @@ static u32 get_bus_freq(void)
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{
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struct device_node *soc;
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u32 sysfreq;
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struct clk *pltclk;
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int ret;
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/* get platform freq by searching bus-frequency property */
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soc = of_find_node_by_type(NULL, "soc");
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if (!soc)
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return 0;
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if (soc) {
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ret = of_property_read_u32(soc, "bus-frequency", &sysfreq);
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of_node_put(soc);
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if (!ret)
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return sysfreq;
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}
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if (of_property_read_u32(soc, "bus-frequency", &sysfreq))
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sysfreq = 0;
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/* get platform freq by its clock name */
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pltclk = clk_get(NULL, "cg-pll0-div1");
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if (IS_ERR(pltclk)) {
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pr_err("%s: can't get bus frequency %ld\n",
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__func__, PTR_ERR(pltclk));
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return PTR_ERR(pltclk);
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}
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of_node_put(soc);
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return sysfreq;
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return clk_get_rate(pltclk);
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}
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static struct clk *cpu_to_clk(int cpu)
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