CLK_40 (reference) in projects: linux-4.1.27

356 enum card_clock	{CLK_20 = 1, CLK_30, CLK_40, CLK_50, CLK_60,  enumerator

736 	case CLK_40:  in switch_normal_clock()

472 				sd_card->sd_clock = CLK_40;  in sd_check_csd()

/linux-4.1.27/drivers/staging/rts5208/
D	rtsx_chip.h	`356 enum card_clock {CLK_20 = 1, CLK_30, CLK_40, CLK_50, CLK_60, enumerator`
D	rtsx.c	`774 chip->fpga_ms_1bit_clk = CLK_40; in rtsx_init_options()`
D	rtsx_card.c	`736 case CLK_40: in switch_normal_clock()`
D	ms.c	`2937 ms_card->ms_clock = CLK_40; in ms_auto_tune_clock()`
D	sd.c	`472 sd_card->sd_clock = CLK_40; in sd_check_csd()`