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Commit b51d3388 authored by YuanTian Tang's avatar YuanTian Tang Committed by Rafael J. Wysocki
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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: default avatarTang Yuantian <andy.tang@nxp.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent cf9a2438

drivers/cpufreq/qoriq-cpufreq.c

+17 −7
Original line number Diff line number Diff line
@@ -52,19 +52,29 @@ 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 (of_property_read_u32(soc, "bus-frequency", &sysfreq))

		sysfreq = 0;



	if (soc) {

		ret = of_property_read_u32(soc, "bus-frequency", &sysfreq);

		of_node_put(soc);



		if (!ret)

			return sysfreq;

	}



	/* 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);

	}



	return clk_get_rate(pltclk);

}



static struct clk *cpu_to_clk(int cpu)

{

	struct device_node *np;