目錄
1. clk的分類
2. 系統呼叫入口
3. leo clk初始化入口
4. of_leo_clocks_init函式leo的clk系統自定義函式
5. of_clk_init
根據clk的特點，clock framework將clock分為fixed rate、gate、devider、mux、fixed factor、composite六類，每一類clock都有相似的功能、相似的控制方式，因而可以使用相同的邏輯，統一處理，這充分體現了物件導向的思想
start_kernel---> time_init
//arch/arm/kernel/time.c
void __init time_init(void)
else
}
//arch/arm/mach-leo/platform_dt.c
static const char *faraday_dt_match __initconst = ;
dt_machine_start(faraday, "leo")
.atag_offset = 0x100,
.dt_compat = faraday_dt_match,
.smp = smp_ops(faraday_smp_ops),
.map_io = platform_map_io,
.init_time = platform_sys_timer_init,
.init_early = platform_init_early,
.init_machine = platform_init,
.restart = platform_reset,
machine_end
static void __init platform_sys_timer_init(void)
static struct of_device_id faraday_clk_match __initconst = ,
{}};
static void __init platform_clock_init(void)
/**
*driver/clk/faraday/clk-leo.c
*/static const __initconst struct of_device_id leo_clk_match = ,
, ,, ,
, ,, ,
, ,, ,
, ,, ,
, ,, ,
, ,, ,
, ,, ,
, ,, ,
, ,};void __init of_leo_clocks_init(struct device_node *n)
printk(kern_info "pll0: %4ld mhz, pll1 mclk: %4ld mhz, pll2: %4ld mhz, pll3: %4ld mhz\n",
pll0/1000/1000, pll1/1000/1000, pll2/1000/1000, pll3/1000/1000);
printk(kern_info "pll4: %4ld mhz, pll5 mclk: %4ld mhz, pll6: %4ld mhz, pll7: %4ld mhz\n",
pll4/1000/1000, pll5/1000/1000, pll6/1000/1000, pll7/1000/1000);
printk(kern_info "cpu: %ld mhz, ddr mclk: %ld mhz, hclk: %ld mhz, pclk: %ld mhz\n",
cpuclk/1000/1000, mclk/1000/1000, hclk/1000/1000, pclk/1000/1000);
printk(kern_info "spi clk: %ld mhz, ssp clk: %ldmhz, ssp_i2s clk: %ldmhz, sd clk: %ldmhz\n",
spiclk/1000/1000, sspclk/1000/1000, sspclk_i2s/1000/1000, sdclk/1000/1000);
printk(kern_info "lc clk: %ldmhz, irda: %ldmhz , gmac_ref: %ldmhz\n",
lcclk/1000/1000, irdaclk/1000/1000,gmacclk/1000/1000);
}
/**
* driver/clk/clk.c
*//**
* of_clk_init() - scan and init clock providers from the dt
* @matches: array of compatible values and init functions for providers.
* * this function scans the device tree for matching clock providers
* and calls their initialization functions. it also does it by trying
* to follow the dependencies.
*/void __init of_clk_init(const struct of_device_id *matches)
of_node_put(np);
return;
} parent->clk_init_cb = match->data;
parent->np = of_node_get(np);
list_add_tail(&parent->node, &clk_provider_list);
} while (!list_empty(&clk_provider_list))
} /*
* we didn't manage to initialize any of the
* remaining providers during the last loop, so now we
* initialize all the remaining ones unconditionally
* in case the clock parent was not mandatory
*/if (!is_init_done)
force = true;
}}
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