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

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Message-ID: <20230315004453.sxzqccyozvsfp374@skbuf>
Date:   Wed, 15 Mar 2023 02:44:53 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, Lee Jones <lee@...nel.org>,
        linux-leds@...r.kernel.org
Subject: Re: [net-next PATCH v3 06/14] net: phy: marvell: Add software
 control of the LEDs

On Tue, Mar 14, 2023 at 11:15:08AM +0100, Christian Marangi wrote:
> From: Andrew Lunn <andrew@...n.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@...n.ch>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.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);
> +}