Re: [PATCH v3 3/6] phy: phy-can-transceiver: Add dual channel support for TJA1048

[Frank Li <Frank.li@nxp.com>]

On Fri, Aug 29, 2025 at 03:08:58PM +0800, Peng Fan wrote:
> - Introduce new flag CAN_TRANSCEIVER_DUAL_CH to indicate the phy has two
>   channels.
> - Alloc a phy for each channel
> - Support TJA1048 which is a dual high-speed CAN transceiver with sleep
>   mode supported.
> - Add can_transceiver_phy_xlate for parsing phy
>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

Reviewed-by: Frank Li <Frank.Li@nxp.com>

> ---
>  drivers/phy/phy-can-transceiver.c | 91 ++++++++++++++++++++++++++++-----------
>  1 file changed, 65 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c
> index 6415c6af0e8414a6cc8d15958a17ee749a3f28e9..f06b1df76ada023f432dce892c3346f45397ab54 100644
> --- a/drivers/phy/phy-can-transceiver.c
> +++ b/drivers/phy/phy-can-transceiver.c
> @@ -17,6 +17,7 @@ struct can_transceiver_data {
>  	u32 flags;
>  #define CAN_TRANSCEIVER_STB_PRESENT	BIT(0)
>  #define CAN_TRANSCEIVER_EN_PRESENT	BIT(1)
> +#define CAN_TRANSCEIVER_DUAL_CH		BIT(2)
>  };
>
>  struct can_transceiver_phy {
> @@ -29,6 +30,7 @@ struct can_transceiver_phy {
>  struct can_transceiver_priv {
>  	struct can_transceiver_phy *can_transceiver_phy;
>  	struct mux_state *mux_state;
> +	int num_ch;
>  };
>
>  /* Power on function */
> @@ -81,6 +83,10 @@ static const struct can_transceiver_data tcan1043_drvdata = {
>  	.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT,
>  };
>
> +static const struct can_transceiver_data tja1048_drvdata = {
> +	.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_DUAL_CH,
> +};
> +
>  static const struct of_device_id can_transceiver_phy_ids[] = {
>  	{
>  		.compatible = "ti,tcan1042",
> @@ -90,6 +96,10 @@ static const struct of_device_id can_transceiver_phy_ids[] = {
>  		.compatible = "ti,tcan1043",
>  		.data = &tcan1043_drvdata
>  	},
> +	{
> +		.compatible = "nxp,tja1048",
> +		.data = &tja1048_drvdata
> +	},
>  	{
>  		.compatible = "nxp,tjr1443",
>  		.data = &tcan1043_drvdata
> @@ -108,6 +118,25 @@ devm_mux_state_get_optional(struct device *dev, const char *mux_name)
>  	return devm_mux_state_get(dev, mux_name);
>  }
>
> +static struct phy *can_transceiver_phy_xlate(struct device *dev,
> +					     const struct of_phandle_args *args)
> +{
> +	struct can_transceiver_priv *priv = dev_get_drvdata(dev);
> +	u32 idx;
> +
> +	if (priv->num_ch == 1)
> +		return priv->can_transceiver_phy[0].generic_phy;
> +
> +	if (args->args_count != 1)
> +		return ERR_PTR(-EINVAL);
> +
> +	idx = args->args[0];
> +	if (idx >= priv->num_ch)
> +		return ERR_PTR(-EINVAL);
> +
> +	return priv->can_transceiver_phy[idx].generic_phy;
> +}
> +
>  static int can_transceiver_phy_probe(struct platform_device *pdev)
>  {
>  	struct phy_provider *phy_provider;
> @@ -120,7 +149,8 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
>  	struct gpio_desc *enable_gpio;
>  	struct mux_state *mux_state;
>  	u32 max_bitrate = 0;
> -	int err;
> +	int num_ch = 1;
> +	int err, i;
>
>  	match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
>  	drvdata = match->data;
> @@ -131,7 +161,11 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
>
>  	platform_set_drvdata(pdev, priv);
>
> -	priv->can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy),
> +	if (drvdata->flags & CAN_TRANSCEIVER_DUAL_CH)
> +		num_ch = 2;
> +
> +	priv->num_ch = num_ch;
> +	priv->can_transceiver_phy = devm_kcalloc(dev, num_ch, sizeof(struct can_transceiver_phy),
>  						 GFP_KERNEL);
>  	if (!priv->can_transceiver_phy)
>  		return -ENOMEM;
> @@ -142,38 +176,43 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
>
>  	priv->mux_state = mux_state;
>
> -	phy = devm_phy_create(dev, dev->of_node,
> -			      &can_transceiver_phy_ops);
> -	if (IS_ERR(phy)) {
> -		dev_err(dev, "failed to create can transceiver phy\n");
> -		return PTR_ERR(phy);
> -	}
> -
>  	err = device_property_read_u32(dev, "max-bitrate", &max_bitrate);
>  	if ((err != -EINVAL) && !max_bitrate)
>  		dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n");
> -	phy->attrs.max_link_rate = max_bitrate;
>
> -	priv->can_transceiver_phy->generic_phy = phy;
> -	priv->can_transceiver_phy->priv = priv;
> +	for (i = 0; i < num_ch; i++) {
> +		phy = devm_phy_create(dev, dev->of_node, &can_transceiver_phy_ops);
> +		if (IS_ERR(phy)) {
> +			dev_err(dev, "failed to create can transceiver phy\n");
> +			return PTR_ERR(phy);
> +		}
>
> -	if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
> -		standby_gpio = devm_gpiod_get_optional(dev, "standby", GPIOD_OUT_HIGH);
> -		if (IS_ERR(standby_gpio))
> -			return PTR_ERR(standby_gpio);
> -		priv->can_transceiver_phy->standby_gpio = standby_gpio;
> -	}
> +		phy->attrs.max_link_rate = max_bitrate;
>
> -	if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
> -		enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
> -		if (IS_ERR(enable_gpio))
> -			return PTR_ERR(enable_gpio);
> -		priv->can_transceiver_phy->enable_gpio = enable_gpio;
> -	}
> +		priv->can_transceiver_phy[i].generic_phy = phy;
> +		priv->can_transceiver_phy[i].priv = priv;
>
> -	phy_set_drvdata(priv->can_transceiver_phy->generic_phy, priv->can_transceiver_phy);
> +		if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
> +			standby_gpio = devm_gpiod_get_index_optional(dev, "standby", i,
> +								     GPIOD_OUT_HIGH);
> +			if (IS_ERR(standby_gpio))
> +				return PTR_ERR(standby_gpio);
> +			priv->can_transceiver_phy[i].standby_gpio = standby_gpio;
> +		}
> +
> +		if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
> +			enable_gpio = devm_gpiod_get_index_optional(dev, "enable", i,
> +								    GPIOD_OUT_LOW);
> +			if (IS_ERR(enable_gpio))
> +				return PTR_ERR(enable_gpio);
> +			priv->can_transceiver_phy[i].enable_gpio = enable_gpio;
> +		}
> +
> +		phy_set_drvdata(priv->can_transceiver_phy[i].generic_phy,
> +				&priv->can_transceiver_phy[i]);
> +	}
>
> -	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	phy_provider = devm_of_phy_provider_register(dev, can_transceiver_phy_xlate);
>
>  	return PTR_ERR_OR_ZERO(phy_provider);
>  }
>
> --
> 2.37.1
>