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realtek: more generic platform initialization
Platform startup still "guesses" the CPU clock speed by DT fixed values. If possible take clock rates from a to be developed driver and align to MIPS generic platfom initialization code. Pack old behaviour into a fallback function. We might get rid of that some day. Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
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@ -13,6 +13,7 @@
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#include <linux/init.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/of_fdt.h>
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#include <linux/irqchip.h>
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@ -48,14 +49,11 @@ void __init plat_mem_setup(void)
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__dt_setup_arch(dtb);
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}
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void __init plat_time_init(void)
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void plat_time_init_fallback(void)
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{
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struct device_node *np;
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u32 freq = 500000000;
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of_clk_init(NULL);
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timer_probe();
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np = of_find_node_by_name(NULL, "cpus");
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if (!np) {
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pr_err("Missing 'cpus' DT node, using default frequency.");
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@ -66,10 +64,41 @@ void __init plat_time_init(void)
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pr_info("CPU frequency from device tree: %dMHz", freq / 1000000);
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of_node_put(np);
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}
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mips_hpt_frequency = freq / 2;
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}
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void __init plat_time_init(void)
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{
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/*
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* Initialization routine resembles generic MIPS plat_time_init() with
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* lazy error handling. The final fallback is only needed until we have
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* converted all device trees to new clock syntax.
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*/
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struct device_node *np;
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struct clk *clk;
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of_clk_init(NULL);
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mips_hpt_frequency = 0;
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np = of_get_cpu_node(0, NULL);
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if (!np) {
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pr_err("Failed to get CPU node\n");
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} else {
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clk = of_clk_get(np, 0);
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if (IS_ERR(clk)) {
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pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
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} else {
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mips_hpt_frequency = clk_get_rate(clk) / 2;
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clk_put(clk);
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}
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}
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if (!mips_hpt_frequency)
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plat_time_init_fallback();
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timer_probe();
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}
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void __init arch_init_irq(void)
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{
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irqchip_init();
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