Re: [net-next PATCH v3 06/14] net: phy: marvell: Add software control of the LEDs

[Vladimir Oltean <olteanv@gmail.com>]

On Tue, Mar 14, 2023 at 11:15:08AM +0100, Christian Marangi wrote:
> From: Andrew Lunn <andrew@lunn.ch>
> 
> Add a brightness function, so the LEDs can be controlled from
> software using the standard Linux LED infrastructure.
> 
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
> +static int m88e1318_led_brightness_set(struct phy_device *phydev,
> +				       u32 index, enum led_brightness value)
> +{
> +	u16 reg;
> +
> +	reg = phy_read_paged(phydev, MII_MARVELL_LED_PAGE,
> +			     MII_88E1318S_PHY_LED_FUNC);
> +	if (reg < 0)
> +		return reg;

"reg" is declared as unsigned, so it's surely positive.

> +
> +	switch (index) {
> +	case 0:
> +	case 1:
> +	case 2:
> +		reg &= ~(0xf << (4 * index));
> +		if (value == LED_OFF)
> +			reg |= MII_88E1318S_PHY_LED_FUNC_OFF << (4 * index);
> +		else
> +			reg |= MII_88E1318S_PHY_LED_FUNC_ON << (4 * index);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return phy_write_paged(phydev, MII_MARVELL_LED_PAGE,
> +			       MII_88E1318S_PHY_LED_FUNC, reg);
> +}