# Re: \[PATCH net-next 10/11\] ptp: ocp: Add IRIG-B output mode control

- From: Jakub Kicinski \<kuba@kernel.org\>
- Date: 2021-09-02 00:07:05 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/09/11210715
- Thread: https://ratatoskr.run/netdev/2021/08/11210543/t.md

```text
On Mon, 30 Aug 2021 16:52:35 -0700 Jonathan Lemon wrote:
> +	err = kstrtou8(buf, 0, &val);
> +	if (err)
> +		return err;
> +	if (val > 7)
> +		return -EINVAL;
> +
> +	reg = ((val & 0x7) << 16);
> +
> +	spin_lock_irqsave(&bp->lock, flags);
> +	iowrite32(0, &bp->irig_out->ctrl);		/* disable */
> +	iowrite32(reg, &bp->irig_out->ctrl);		/* change mode */
> +	iowrite32(reg | IRIG_M_CTRL_ENABLE, &bp->irig_out->ctrl);
> +	spin_unlock_irqrestore(&bp->lock, flags);

locking
```