netdev - Re: [PATCH leds v2 10/10] leds: turris-omnia: support offloading netdev trigger for WAN LED

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Date:   Tue, 1 Jun 2021 23:19:30 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behún <kabel@...nel.org>
Cc:     linux-leds@...r.kernel.org, netdev@...r.kernel.org,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Russell King <linux@...linux.org.uk>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: Re: [PATCH leds v2 10/10] leds: turris-omnia: support offloading
 netdev trigger for WAN LED

> +static int omnia_led_trig_offload_wan(struct omnia_leds *leds,
> +				      struct omnia_led *led,
> +				      struct led_netdev_data *trig)
> +{
> +	unsigned long period;
> +	int ret, blink_rate;
> +	bool link, rx, tx;
> +	u8 fun;
> +
> +	/* HW offload on WAN port is supported only via internal PHY */
> +	if (trig->net_dev->sfp_bus || !trig->net_dev->phydev)
> +		return -EOPNOTSUPP;
> +
> +	link = test_bit(NETDEV_LED_LINK, &trig->mode);
> +	rx = test_bit(NETDEV_LED_RX, &trig->mode);
> +	tx = test_bit(NETDEV_LED_TX, &trig->mode);
> +
> +	if (link && rx && tx)
> +		fun = 0x1;
> +	else if (!link && rx && tx)
> +		fun = 0x4;
> +	else
> +		return -EOPNOTSUPP;
> +
> +	period = jiffies_to_msecs(atomic_read(&trig->interval)) * 2;
> +	blink_rate = wan_led_round_blink_rate(&period);
> +	if (blink_rate < 0)
> +		return blink_rate;
> +
> +	mutex_lock(&leds->lock);
> +
> +	if (!led->phydev) {
> +		led->phydev = trig->net_dev->phydev;
> +		get_device(&led->phydev->mdio.dev);
> +	}
> +
> +	/* set PHY's LED[0] pin to blink according to trigger setting */
> +	ret = phy_modify_paged(led->phydev, MII_MARVELL_LED_PAGE,
> +			       MII_PHY_LED_TCR,
> +			       MII_PHY_LED_TCR_PULSESTR_MASK |
> +			       MII_PHY_LED_TCR_BLINKRATE_MASK,
> +			       (0 << MII_PHY_LED_TCR_PULSESTR_SHIFT) |
> +			       (blink_rate << MII_PHY_LED_TCR_BLINKRATE_SHIFT));
> +	if (ret)
> +		goto unlock;
> +
> +	ret = phy_modify_paged(led->phydev, MII_MARVELL_LED_PAGE,
> +			       MII_PHY_LED_CTRL, 0xf, fun);
> +	if (ret)
> +		goto unlock;

This needs to be in the Marvell PHY driver. Please add a generic
interface any PHY driver can implement to allow its LEDs to be
controlled.

	Andrew