linux-kernel - Re: [RFC PATCH net-next 8/9] net: dsa: microchip: ksz9477: add Pulse Per Second (PPS) support

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Date:   Mon, 19 Oct 2020 20:46:17 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Eggers <ceggers@...i.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Helmut Grohne <helmut.grohne@...enta.de>,
        Paul Barker <pbarker@...sulko.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        George McCollister <george.mccollister@...il.com>,
        Marek Vasut <marex@...x.de>,
        Tristram Ha <Tristram.Ha@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 8/9] net: dsa: microchip: ksz9477: add Pulse
 Per Second (PPS) support

On Mon, Oct 19, 2020 at 07:24:34PM +0200, Christian Eggers wrote:
>  static int ksz9477_ptp_enable(struct ptp_clock_info *ptp, struct ptp_clock_request *req, int on)
>  {
> -	return -ENOTTY;
> +	struct ksz_device *dev = container_of(ptp, struct ksz_device, ptp_caps);
> +	int ret;
> +
> +	switch (req->type) {
> +	case PTP_CLK_REQ_PPS:
> +		mutex_lock(&dev->ptp_mutex);
> +		ret = ksz9477_ptp_enable_pps(dev, on);
> +		mutex_unlock(&dev->ptp_mutex);
> +		return ret;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
>  }

Nope, this is not what you're looking for. Please implement
PTP_CLK_REQ_PEROUT.