Re: [PATCH v2 2/3] can: m_can: m_can_platform: Add support for enabling transceiver

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Faiz

On 2/17/20 8:28 AM, Faiz Abbas wrote:
CAN transceivers on some boards have a standby line which can be
toggled to enable/disable the transceiver. Model this as an optional
fixed xceiver regulator.

Signed-off-by: Faiz Abbas <faiz_abbas@xxxxxx>
Acked-by: Sriram Dash <sriram.dash@xxxxxxxxxxx>
---
  drivers/net/can/m_can/m_can_platform.c | 6 ++++++
  1 file changed, 6 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..719468fab507 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/regulator/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 regulator *reg_xceiver;
  	struct resource *res;
  	void __iomem *addr;
  	void __iomem *mram_addr;
@@ -111,6 +113,10 @@ static int m_can_plat_probe(struct platform_device *pdev)
m_can_init_ram(mcan_class); + reg_xceiver = devm_regulator_get_optional(&pdev->dev, "xceiver");
+	if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+

Where is this regulator enabled?

Shouldn't the regulator be managed by runtime PM as well?

Dan




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