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am335x 定时器配置 时钟设置失败



linux下面想要启用一个定时器,用omap_dm_timer_set_source设置时钟源时  omap_dm_timer_set_source(timer_ptr, OMAP_TIMER_SRC_SYS_CLK );

提示

omap2_dm_timer_set_src: 482: clk_get() sys_ck FAILED网上有人说改为clk_32k,但是我试了 还是提示类似的

omap2_dm_timer_set_src: 482: clk_get() 32k_ck FAILED

该如何配置,请高人指点一下