[PATCH 2/3] can: m_can: m_can_platform: Add support for enabling transceiver through the STB line

Faiz Abbas
2020-01-22T08:02:14Z

CAN transceivers on some boards have an STB (standby) line which can be
toggled to enable/disable the transceiver. Add support for enabling the
transceiver using a GPIO connected to the STB line.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
drivers/net/can/m_can/m_can_platform.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 38ea5e600fb8..b4e1423bd5d8 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -6,6 +6,7 @@
// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/

#include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>

#include "m_can.h"

@@ -57,6 +58,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
{
struct m_can_classdev *mcan_class;
struct m_can_plat_priv *priv;
+ struct gpio_desc *stb;
struct resource *res;
void __iomem *addr;
void __iomem *mram_addr;
@@ -111,6 +113,16 @@ static int m_can_plat_probe(struct platform_device *pdev)

m_can_init_ram(mcan_class);

+ stb = devm_gpiod_get_optional(&pdev->dev, "stb", GPIOD_OUT_HIGH);
+ if (IS_ERR(stb)) {
+ ret = PTR_ERR(stb);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev,
+ "gpio request failed, ret %d\n", ret);
+
+ goto failed_ret;
+ }
+
ret = m_can_class_register(mcan_class);

failed_ret:
--
2.19.2