2  * drivers/cpufreq/spear-cpufreq.c
16 #include <linux/clk.h>
28 	struct clk *clk;  member
34 static struct clk *spear1340_cpu_get_possible_parent(unsigned long newfreq)  in spear1340_cpu_get_possible_parent()
36 	struct clk *sys_pclk;  in spear1340_cpu_get_possible_parent()
39 	 * In SPEAr1340, cpu clk's parent sys clk can take input from  in spear1340_cpu_get_possible_parent()
50 	 * As sys clk can have multiple source with their own range  in spear1340_cpu_get_possible_parent()
60 		return ERR_PTR(-EINVAL);  in spear1340_cpu_get_possible_parent()
72  * access a source clock (clk) which might not be ancestor of cpu at present.
73  * Hence in SPEAr1340 we would operate on source clock directly before switching
76 static int spear1340_set_cpu_rate(struct clk *sys_pclk, unsigned long newfreq)  in spear1340_set_cpu_rate()
78 	struct clk *sys_clk;  in spear1340_set_cpu_rate()
81 	sys_clk = clk_get_parent(spear_cpufreq.clk);  in spear1340_set_cpu_rate()
87 	/* Set the rate of the source clock before changing the parent */  in spear1340_set_cpu_rate()
90 		pr_err("Failed to set sys clk rate to %lu\n", newfreq);  in spear1340_set_cpu_rate()
96 		pr_err("Failed to set sys clk parent\n");  in spear1340_set_cpu_rate()
107 	struct clk *srcclk;  in spear_cpufreq_target()
115 		 * of multiple clock sources for cpu clk's parent we can have  in spear_cpufreq_target()
116 		 * different clock source for different frequency of cpu clk.  in spear_cpufreq_target()
122 			pr_err("Failed to get src clk\n");  in spear_cpufreq_target()
126 		/* SPEAr1340: src clk is always 2 * intended cpu clk */  in spear_cpufreq_target()
131 		 * can directly work on cpu clk  in spear_cpufreq_target()
133 		srcclk = spear_cpufreq.clk;  in spear_cpufreq_target()
145 		ret = clk_set_rate(spear_cpufreq.clk, newfreq);  in spear_cpufreq_target()
155 	policy->clk = spear_cpufreq.clk;  in spear_cpufreq_init()
162 	.name		= "cpufreq-spear",
182 		return -ENODEV;  in spear_cpufreq_probe()
185 	if (of_property_read_u32(np, "clock-latency",  in spear_cpufreq_probe()
190 	if (!prop || !prop->value) {  in spear_cpufreq_probe()
192 		ret = -ENODEV;  in spear_cpufreq_probe()
196 	cnt = prop->length / sizeof(u32);  in spear_cpufreq_probe()
197 	val = prop->value;  in spear_cpufreq_probe()
201 		ret = -ENOMEM;  in spear_cpufreq_probe()
214 	spear_cpufreq.clk = clk_get(NULL, "cpu_clk");  in spear_cpufreq_probe()
215 	if (IS_ERR(spear_cpufreq.clk)) {  in spear_cpufreq_probe()
217 		ret = PTR_ERR(spear_cpufreq.clk);  in spear_cpufreq_probe()
226 	clk_put(spear_cpufreq.clk);  in spear_cpufreq_probe()
239 		.name	= "spear-cpufreq",