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

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Message-ID: <20210901170700.4ad3c3fa@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 1 Sep 2021 17:07:00 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     davem@...emloft.net, richardcochran@...il.com,
        netdev@...r.kernel.org, kernel-team@...com, abyagowi@...com
Subject: Re: [PATCH net-next 10/11] ptp: ocp: Add IRIG-B output mode control

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