REG_CLK_CFG
io_write(sd, REG_CLK_CFG, CLK_CFG_SEL_ACLK_EN | CLK_CFG_SEL_ACLK);
io_write(sd, REG_CLK_CFG, CLK_CFG_DIS);
err = regmap_update_bits(priv->regmap, REG_CLK_CFG, CLK_CFG_SOURCE_XTAL,