[PATCH 2/2] can: flexcan: allow the control of the STB CAN transceiver pin
From: Fabio Estevam <festevam@gmail.com>
Date: 2021-01-07 21:00:13
Also in:
linux-can
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
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 --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);
--
2.17.1