Messages in this thread Patch in this message | | | From | Faiz Abbas <> | Subject | [PATCH 2/3] can: m_can: m_can_platform: Add support for enabling transceiver through the STB line | Date | Wed, 22 Jan 2020 13:33:09 +0530 |
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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
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