diff mbox series

[2/2] can: flexcan: allow the control of the STB CAN transceiver pin

Message ID 20210107205915.7602-2-festevam@gmail.com
State New
Headers show
Series [1/2] dt-bindings: can: fsl,flexcan.yaml: introduce the stb-gpios property | expand

Commit Message

Fabio Estevam Jan. 7, 2021, 8:59 p.m. UTC 
It is very common to have an STB pin in CAN transceivers, which allows
putting the transceiver in standby or normal operation mode.

Add support for handling the STB pin.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
 drivers/net/can/flexcan.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 038fe1036df2..094050b4b461 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -17,6 +17,7 @@ 
 #include <linux/can/rx-offload.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
@@ -358,6 +359,8 @@  struct flexcan_priv {
 	struct regulator *reg_xceiver;
 	struct flexcan_stop_mode stm;
 
+	struct gpio_desc *stb;
+
 	/* Read and Write APIs */
 	u32 (*read)(void __iomem *addr);
 	void (*write)(u32 val, void __iomem *addr);
@@ -617,6 +620,8 @@  static void flexcan_clks_disable(const struct flexcan_priv *priv)
 
 static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
 {
+	gpiod_set_value_cansleep(priv->stb, 0);
+
 	if (!priv->reg_xceiver)
 		return 0;
 
@@ -625,6 +630,8 @@  static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
 
 static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
 {
+	gpiod_set_value_cansleep(priv->stb, 1);
+
 	if (!priv->reg_xceiver)
 		return 0;
 
@@ -2044,6 +2051,10 @@  static int flexcan_probe(struct platform_device *pdev)
 		priv->can.bittiming_const = &flexcan_bittiming_const;
 	}
 
+	priv->stb = devm_gpiod_get_optional(&pdev->dev, "stb", GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->stb))
+		return PTR_ERR(priv->stb);
+
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);