Re: [PATCH v2 2/2] can: flexcan: add transceiver capabilities

Marc Kleine-Budde
2025-02-20T08:43:27Z

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On 20.02.2025 09:22:11, Dimitri Fedrau via B4 Relay wrote:
> From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
>
> Currently the flexcan driver does only support adding PHYs by using the
> "old" regulator bindings. Add support for CAN transceivers as a PHY. Add
> the capability to ensure that the PHY is in operational state when the link
> is set to an "up" state.
>
> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
> ---
> drivers/net/can/flexcan/flexcan-core.c | 30 ++++++++++++++++++++++++------
> drivers/net/can/flexcan/flexcan.h | 1 +
> 2 files changed, 25 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
> index b347a1c93536d54efaa5f7d3347bd47c20860b3e..45d9a6957d9a806ed80d810a6a5f7eb99fcc702c 100644
> --- a/drivers/net/can/flexcan/flexcan-core.c
> +++ b/drivers/net/can/flexcan/flexcan-core.c
> @@ -30,6 +30,7 @@
> #include <linux/property.h>
> #include <linux/regmap.h>
> #include <linux/regulator/consumer.h>
> +#include <linux/phy/phy.h>
>
> #include "flexcan.h"
>
> @@ -644,18 +645,22 @@ static void flexcan_clks_disable(const struct flexcan_priv *priv)
>
> static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
> {
> - if (!priv->reg_xceiver)
> - return 0;
> + if (priv->reg_xceiver)
> + return regulator_enable(priv->reg_xceiver);
> + else if (priv->transceiver)
> + return phy_power_on(priv->transceiver);
>
> - return regulator_enable(priv->reg_xceiver);
> + return 0;
> }
>
> static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
> {
> - if (!priv->reg_xceiver)
> - return 0;
> + if (priv->reg_xceiver)
> + return regulator_disable(priv->reg_xceiver);
> + else if (priv->transceiver)
> + return phy_power_off(priv->transceiver);
>
> - return regulator_disable(priv->reg_xceiver);
> + return 0;
> }
>
> static int flexcan_chip_enable(struct flexcan_priv *priv)
> @@ -2086,6 +2091,7 @@ static int flexcan_probe(struct platform_device *pdev)
> struct net_device *dev;
> struct flexcan_priv *priv;
> struct regulator *reg_xceiver;
> + struct phy *transceiver;
> struct clk *clk_ipg = NULL, *clk_per = NULL;
> struct flexcan_regs __iomem *regs;
> struct flexcan_platform_data *pdata;
> @@ -2101,6 +2107,14 @@ static int flexcan_probe(struct platform_device *pdev)
> else if (IS_ERR(reg_xceiver))
> return PTR_ERR(reg_xceiver);
>
> + transceiver = devm_phy_optional_get(&pdev->dev, NULL);
> + if (PTR_ERR(transceiver) == -EPROBE_DEFER) {
> + return -EPROBE_DEFER;
> + } else if (IS_ERR(transceiver)) {
> + dev_err(&pdev->dev, "failed to get phy\n");
> + return PTR_ERR(transceiver);
> + }

Please use dev_err_probe(), it will be silent in case of EPROBE_DEFER.

Marc

--
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