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

Dimitri Fedrau via B4 Relay
2025-02-20T08:22:18Z

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);
+ }
+
if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node,
"clock-frequency", &clock_freq);
@@ -2198,6 +2212,10 @@ static int flexcan_probe(struct platform_device *pdev)
priv->clk_per = clk_per;
priv->clk_src = clk_src;
priv->reg_xceiver = reg_xceiver;
+ priv->transceiver = transceiver;
+
+ if (transceiver)
+ priv->can.bitrate_max = transceiver->attrs.max_link_rate;

if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
priv->irq_boff = platform_get_irq(pdev, 1);
diff --git a/drivers/net/can/flexcan/flexcan.h b/drivers/net/can/flexcan/flexcan.h
index 2cf886618c9621166173b865f266830b3f6c1fb0..16692a2502eba26575eeeec83dfffdf35f07b034 100644
--- a/drivers/net/can/flexcan/flexcan.h
+++ b/drivers/net/can/flexcan/flexcan.h
@@ -107,6 +107,7 @@ struct flexcan_priv {
struct clk *clk_per;
struct flexcan_devtype_data devtype_data;
struct regulator *reg_xceiver;
+ struct phy *transceiver;
struct flexcan_stop_mode stm;

int irq_boff;

--
2.39.5