Re: [PATCH net-next] net: phy: dp83822: Add support for PHY LEDs on DP83822

[Andrew Lunn <andrew@lunn.ch>]

> +static int dp83822_led_hw_control_set(struct phy_device *phydev, u8 index,
> +				      unsigned long rules)
> +{
> +	int mode;
> +
> +	mode = dp83822_led_mode(index, rules);
> +	if (mode < 0)
> +		return mode;
> +
> +	if (index == DP83822_LED_INDEX_LED_0 || index == DP83822_LED_INDEX_COL_GPIO2)
> +		return phy_modify_mmd(phydev, MDIO_MMD_VEND2,
> +				      MII_DP83822_MLEDCR, DP83822_MLEDCR_CFG,
> +				      FIELD_PREP(DP83822_MLEDCR_CFG, mode));
> +	else if (index == DP83822_LED_INDEX_LED_1_GPIO1)
> +		return phy_modify_mmd(phydev, MDIO_MMD_VEND2,
> +				      MII_DP83822_LEDCFG1,
> +				      DP83822_LEDCFG1_LED1_CTRL,
> +				      FIELD_PREP(DP83822_LEDCFG1_LED1_CTRL,
> +						 mode));
> +	else
> +		return phy_modify_mmd(phydev, MDIO_MMD_VEND2,
> +				      MII_DP83822_LEDCFG1,
> +				      DP83822_LEDCFG1_LED3_CTRL,
> +				      FIELD_PREP(DP83822_LEDCFG1_LED3_CTRL,
> +						 mode));

index is taken direct from DT. Somebody might have:

           leds {
                #address-cells = <1>;
                #size-cells = <0>;

                led@42 {
                    reg = <42>;
                    color = <LED_COLOR_ID_WHITE>;
                    function = LED_FUNCTION_LAN;
                    default-state = "keep";
                };
            };

so you should not assume if it is not 0, 1 or 2, then it must be
3. Please always validate index.


    Andrew

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