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Message-ID: <CALC8CXc3OAqY5XTN1XivSbSdki2ZcPKTqJfXruRiq=KWQPbR5w@mail.gmail.com>
Date: Thu, 2 Oct 2025 12:24:10 -0400
From: ChaosEsque Team <chaosesqueteam@...il.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>, Frank Li <frank.li@....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 3/6] phy: phy-can-transceiver: Add dual channel support
for TJA1048
Peng Fan.
Bet you once were of the tribe of the Wolf.
Pen Fang.
On Fri, Aug 22, 2025 at 12:07 AM Peng Fan <peng.fan@....com> wrote:
>
> - Introduce new flag CAN_TRANSCEIVER_DUAL_CH to indicate the phy
> has two channels.
> - Introduce can_transceiver_priv as a higher level encapsulation for
> phy, mux_state, num_ch.
> - Alloc a phy for each channel
> - Support TJA1048 which is a dual high-speed CAN transceiver with
> Sleep mode supported.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> drivers/phy/phy-can-transceiver.c | 117 +++++++++++++++++++++++++++-----------
> 1 file changed, 83 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c
> index b49371a1272cd8a25b5e2271586b756103c64f0a..0e7b23073bfa8eae7200d30dc657a979f6cc9d86 100644
> --- a/drivers/phy/phy-can-transceiver.c
> +++ b/drivers/phy/phy-can-transceiver.c
> @@ -17,13 +17,20 @@ 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 {
> struct phy *generic_phy;
> struct gpio_desc *standby_gpio;
> struct gpio_desc *enable_gpio;
> + struct can_transceiver_priv *priv;
> +};
> +
> +struct can_transceiver_priv {
> + struct can_transceiver_phy *can_transceiver_phy;
> struct mux_state *mux_state;
> + int num_ch;
> };
>
> /* Power on function */
> @@ -32,8 +39,8 @@ static int can_transceiver_phy_power_on(struct phy *phy)
> struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
> int ret;
>
> - if (can_transceiver_phy->mux_state) {
> - ret = mux_state_select(can_transceiver_phy->mux_state);
> + if (can_transceiver_phy->priv->mux_state) {
> + ret = mux_state_select(can_transceiver_phy->priv->mux_state);
> if (ret) {
> dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret);
> return ret;
> @@ -56,8 +63,8 @@ static int can_transceiver_phy_power_off(struct phy *phy)
> gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
> if (can_transceiver_phy->enable_gpio)
> gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
> - if (can_transceiver_phy->mux_state)
> - mux_state_deselect(can_transceiver_phy->mux_state);
> + if (can_transceiver_phy->priv->mux_state)
> + mux_state_deselect(can_transceiver_phy->priv->mux_state);
>
> return 0;
> }
> @@ -76,6 +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",
> @@ -85,6 +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,tja1051",
> .data = &tcan1043_drvdata
> @@ -107,11 +122,27 @@ 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];
> +
> + return priv->can_transceiver_phy[idx].generic_phy;
> +}
> +
> static int can_transceiver_phy_probe(struct platform_device *pdev)
> {
> struct phy_provider *phy_provider;
> struct device *dev = &pdev->dev;
> - struct can_transceiver_phy *can_transceiver_phy;
> + struct can_transceiver_priv *priv;
> const struct can_transceiver_data *drvdata;
> const struct of_device_id *match;
> struct phy *phy;
> @@ -119,52 +150,70 @@ 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;
> -
> - can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL);
> - if (!can_transceiver_phy)
> - return -ENOMEM;
> + int num_ch = 1;
> + int err, i;
>
> match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
> drvdata = match->data;
>
> + priv = devm_kzalloc(dev, sizeof(struct can_transceiver_priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, priv);
> +
> + 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;
> +
> mux_state = devm_mux_state_get_optional(dev, NULL);
> if (IS_ERR(mux_state))
> return PTR_ERR(mux_state);
>
> - can_transceiver_phy->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);
> - }
> + priv->mux_state = mux_state;
>
> 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;
>
> - can_transceiver_phy->generic_phy = phy;
> + 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);
> - 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);
> - can_transceiver_phy->enable_gpio = enable_gpio;
> - }
> + priv->can_transceiver_phy[i].generic_phy = phy;
> + priv->can_transceiver_phy[i].priv = priv;
> +
> + 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(can_transceiver_phy->generic_phy, can_transceiver_phy);
> + 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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