wl18xx_top_reg_read
int __must_check wl18xx_top_reg_read(struct wl1271 *wl, int addr, u16 *out);
ret = wl18xx_top_reg_read(wl, PRIMARY_CLK_DETECT, &clk_freq);
ret = wl18xx_top_reg_read(wl, TOP_FN0_CCCR_REG_32, &irq_invert);