RSTV6110_CTRL2
priv->regs[RSTV6110_CTRL2] &= ~0xc0;
priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
priv->regs[RSTV6110_CTRL2] &= ~0x0f;
priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);