netdev - Re: [PATCH 2/2] net: phy: dp83867: add support for changing LED modes

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Message-ID: <20210319161418.GS12621@pengutronix.de>
Date:   Fri, 19 Mar 2021 17:14:18 +0100
From:   Michael Tretter <m.tretter@...gutronix.de>
To:     netdev@...r.kernel.org, devicetree@...r.kernel.org
Cc:     kernel@...gutronix.de, robh+dt@...nel.org, andrew@...n.ch,
        hkallweit1@...il.com
Subject: Re: [PATCH 2/2] net: phy: dp83867: add support for changing LED modes

On Fri, 19 Mar 2021 16:57:10 +0100, Michael Tretter wrote:
> From: Thomas Haemmerle <thomas.haemmerle@...fvision.net>
> 
> The DP83867 supports four configurable LEDs. Several functions can be
> multiplexed to these LEDs. The multiplexing can be configured in the
> LEDCR1 register.
> 
> Add support for changing the multiplexing of the LEDs via device tree.
> 
> Signed-off-by: Thomas Haemmerle <thomas.haemmerle@...fvision.net>
> Signed-off-by: Michael Tretter <m.tretter@...gutronix.de>
> ---
>  drivers/net/phy/dp83867.c | 57 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
> index 9bd9a5c0b1db..dfcac95941f3 100644
> --- a/drivers/net/phy/dp83867.c
> +++ b/drivers/net/phy/dp83867.c
> @@ -25,6 +25,7 @@
>  #define MII_DP83867_MICR	0x12
>  #define MII_DP83867_ISR		0x13
>  #define DP83867_CFG2		0x14
> +#define DP83867_LEDCR1		0x18
>  #define DP83867_CFG3		0x1e
>  #define DP83867_CTRL		0x1f
>  
> @@ -138,6 +139,12 @@
>  #define DP83867_DOWNSHIFT_4_COUNT	4
>  #define DP83867_DOWNSHIFT_8_COUNT	8
>  
> +/* LEDCR1 bits */
> +#define DP83867_LEDCR1_LED_0_SEL	GENMASK(3, 0)
> +#define DP83867_LEDCR1_LED_1_SEL	GENMASK(7, 4)
> +#define DP83867_LEDCR1_LED_2_SEL	GENMASK(11, 8)
> +#define DP83867_LEDCR1_LED_GPIO_SEL	GENMASK(15, 12)
> +
>  /* CFG3 bits */
>  #define DP83867_CFG3_INT_OE			BIT(7)
>  #define DP83867_CFG3_ROBUST_AUTO_MDIX		BIT(9)
> @@ -154,6 +161,14 @@ enum {
>  	DP83867_PORT_MIRROING_DIS,
>  };
>  
> +enum {
> +	DP83867_LED_0,
> +	DP83867_LED_1,
> +	DP83867_LED_2,
> +	DP83867_LED_GPIO,
> +	DP83867_LED_MAX,
> +};
> +
>  struct dp83867_private {
>  	u32 rx_id_delay;
>  	u32 tx_id_delay;
> @@ -165,6 +180,7 @@ struct dp83867_private {
>  	bool set_clk_output;
>  	u32 clk_output_sel;
>  	bool sgmii_ref_clk_en;
> +	u32 led_mode[DP83867_LED_MAX];
>  };
>  
>  static int dp83867_ack_interrupt(struct phy_device *phydev)
> @@ -521,6 +537,27 @@ static int dp83867_verify_rgmii_cfg(struct phy_device *phydev)
>  }
>  
>  #if IS_ENABLED(CONFIG_OF_MDIO)
> +static int dp83867_of_led_mode_read(struct device_node *of_node,
> +				    const char *led_name, u32 *mode)
> +{
> +	u32 tmp;
> +	int index;
> +	int err;
> +
> +	index = of_property_match_string(of_node, "ti,dp83867-led-mode-names",
> +					 led_name);
> +	err = of_property_read_u32_index(of_node, "ti,dp83867-led-modes",
> +					 index, tmp);

This should have been &tmp.

I will wait for some more review feedback by others especially for the dt
bindings and send a v2.

> +	if (err)
> +		return err;
> +	if (tmp == 0xc || tmp >= 0xf)
> +		return -EINVAL;
> +
> +	*mode = tmp;
> +
> +	return 0;
> +}
> +
>  static int dp83867_of_init(struct phy_device *phydev)
>  {
>  	struct dp83867_private *dp83867 = phydev->priv;
> @@ -614,6 +651,15 @@ static int dp83867_of_init(struct phy_device *phydev)
>  		return -EINVAL;
>  	}
>  
> +	dp83867_of_led_mode_read(of_node, "led-0",
> +				 &dp83867->led_mode[DP83867_LED_0]);
> +	dp83867_of_led_mode_read(of_node, "led-1",
> +				 &dp83867->led_mode[DP83867_LED_1]);
> +	dp83867_of_led_mode_read(of_node, "led-2",
> +				 &dp83867->led_mode[DP83867_LED_2]);
> +	dp83867_of_led_mode_read(of_node, "led-gpio",
> +				 &dp83867->led_mode[DP83867_LED_GPIO]);
> +
>  	return 0;
>  }
>  #else
> @@ -632,6 +678,11 @@ static int dp83867_probe(struct phy_device *phydev)
>  	if (!dp83867)
>  		return -ENOMEM;
>  
> +	dp83867->led_mode[DP83867_LED_0] = DP83867_LED_LINK_EST;
> +	dp83867->led_mode[DP83867_LED_1] = DP83867_LED_1000_BT_LINK;
> +	dp83867->led_mode[DP83867_LED_2] = DP83867_LED_RX_TX_ACT;
> +	dp83867->led_mode[DP83867_LED_GPIO] = DP83867_LED_100_BT_LINK;
> +
>  	phydev->priv = dp83867;
>  
>  	return dp83867_of_init(phydev);
> @@ -792,6 +843,12 @@ static int dp83867_config_init(struct phy_device *phydev)
>  		phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL, val);
>  	}
>  
> +	val = FIELD_PREP(DP83867_LEDCR1_LED_0_SEL, dp83867->led_mode[DP83867_LED_0]) |
> +	      FIELD_PREP(DP83867_LEDCR1_LED_1_SEL, dp83867->led_mode[DP83867_LED_1]) |
> +	      FIELD_PREP(DP83867_LEDCR1_LED_2_SEL, dp83867->led_mode[DP83867_LED_2]) |
> +	      FIELD_PREP(DP83867_LEDCR1_LED_GPIO_SEL, dp83867->led_mode[DP83867_LED_GPIO]);
> +	phy_write(phydev, DP83867_LEDCR1, val);
> +
>  	val = phy_read(phydev, DP83867_CFG3);
>  	/* Enable Interrupt output INT_OE in CFG3 register */
>  	if (phy_interrupt_is_valid(phydev))
> -- 
> 2.29.2
> 
>