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Message-ID: <aLG6izjPDAfkk4D2@lizhi-Precision-Tower-5810>
Date: Fri, 29 Aug 2025 10:34:51 -0400
From: Frank Li <Frank.li@....com>
To: Peng Fan <peng.fan@....com>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Aswath Govindraju <a-govindraju@...com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, Haibo Chen <haibo.chen@....com>,
linux-can@...r.kernel.org, linux-phy@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/6] phy: phy-can-transceiver: Add dual channel
support for TJA1048
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@....com>
Reviewed-by: Frank Li <Frank.Li@....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
>
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