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path: root/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch
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From 5d5eef59a48e3b8e0f67c2ab0963d380c7a7399d Mon Sep 17 00:00:00 2001
From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Date: Mon, 2 May 2016 22:05:53 +0300
Subject: [PATCH] can: rcar_can: add enable and standby control pins

Add enable and standby can transceiver control pins

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
---
 .../devicetree/bindings/net/can/rcar_can.txt       |  4 ++
 drivers/net/can/rcar/rcar_can.c                         | 58 +++++++++++++++++-----
 include/linux/can/platform/rcar_can.h              |  2 +
 3 files changed, 51 insertions(+), 13 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/rcar_can.txt b/Documentation/devicetree/bindings/net/can/rcar_can.txt
index 8d40ab2..9293cf8 100644
--- a/Documentation/devicetree/bindings/net/can/rcar_can.txt
+++ b/Documentation/devicetree/bindings/net/can/rcar_can.txt
@@ -38,6 +38,7 @@ Optional properties:
 			    <0x0> (default) : Peripheral clock (clkp1)
 			    <0x1> : Peripheral clock (clkp2)
 			    <0x3> : Externally input clock
+- gpios: GPIO used for controlling the enable pin and standby pin
 
 Example
 -------
@@ -59,5 +60,8 @@ Board specific .dts file:
 &can0 {
 	pinctrl-0 = <&can0_pins>;
 	pinctrl-names = "default";
+	gpios = <&gpio5 29 GPIO_ACTIVE_HIGH /* enable */
+		 &gpio5 30 GPIO_ACTIVE_LOW /* standby */
+		>;
 	status = "okay";
 };
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 788459f..887ca37 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/can/platform/rcar_can.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #define RCAR_CAN_DRV_NAME	"rcar_can"
 
@@ -94,6 +95,8 @@ struct rcar_can_priv {
 	u32 tx_tail;
 	u8 clock_select;
 	u8 ier;
+	unsigned int enable_pin; /* transceiver enable */
+	unsigned int standby_pin; /* transceiver standby */
 };
 
 static const struct can_bittiming_const rcar_can_bittiming_const = {
@@ -505,6 +508,10 @@ static int rcar_can_open(struct net_device *ndev)
 	struct rcar_can_priv *priv = netdev_priv(ndev);
 	int err;
 
+	/* transceiver normal mode */
+	if (gpio_is_valid(priv->standby_pin))
+		gpio_set_value(priv->standby_pin, 1);
+
 	err = clk_prepare_enable(priv->clk);
 	if (err) {
 		netdev_err(ndev,
@@ -581,6 +588,9 @@ static int rcar_can_close(struct net_device *ndev)
 	clk_disable_unprepare(priv->clk);
 	close_candev(ndev);
 	can_led_event(ndev, CAN_LED_EVENT_STOP);
+	/* transceiver stanby mode */
+	if (gpio_is_valid(priv->standby_pin))
+		gpio_set_value(priv->standby_pin, 0);
 	return 0;
 }
 
@@ -743,20 +753,9 @@ static int rcar_can_probe(struct platform_device *pdev)
 	struct resource *mem;
 	void __iomem *addr;
 	u32 clock_select = CLKR_CLKP1;
-	int err = -ENODEV;
+	int err = -ENODEV, ret;
 	int irq;
-
-	if (pdev->dev.of_node) {
-		of_property_read_u32(pdev->dev.of_node,
-				     "renesas,can-clock-select", &clock_select);
-	} else {
-		pdata = dev_get_platdata(&pdev->dev);
-		if (!pdata) {
-			dev_err(&pdev->dev, "No platform data provided!\n");
-			goto fail;
-		}
-		clock_select = pdata->clock_select;
-	}
+	enum of_gpio_flags enable_flags, standby_flags;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
@@ -826,6 +825,39 @@ static int rcar_can_probe(struct platform_device *pdev)
 
 	devm_can_led_init(ndev);
 
+	if (pdev->dev.of_node) {
+		of_property_read_u32(pdev->dev.of_node,
+				     "renesas,can-clock-select", &clock_select);
+		priv->enable_pin = of_get_gpio_flags(pdev->dev.of_node, 0, &enable_flags);
+		priv->standby_pin = of_get_gpio_flags(pdev->dev.of_node, 1, &standby_flags);
+	} else {
+		pdata = dev_get_platdata(&pdev->dev);
+		if (!pdata) {
+			dev_err(&pdev->dev, "No platform data provided!\n");
+			goto fail;
+		}
+		clock_select = pdata->clock_select;
+		priv->enable_pin = pdata->enable_pin;
+		priv->standby_pin = pdata->standby_pin;
+	}
+
+	if (gpio_is_valid(priv->enable_pin)) {
+		int val = enable_flags & OF_GPIO_ACTIVE_LOW ?
+			  GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
+		ret = devm_gpio_request_one(&pdev->dev, priv->enable_pin, val, "enable");
+		if (ret)
+			dev_info(&pdev->dev, "Failed to request enable pin\n");
+	}
+
+	if (gpio_is_valid(priv->standby_pin)) {
+		int val = standby_flags & OF_GPIO_ACTIVE_LOW ?
+			  GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
+		/* transceiver standby mode */
+		ret = devm_gpio_request_one(&pdev->dev, priv->standby_pin, val, "standby");
+		if (ret)
+			dev_info(&pdev->dev, "Failed to request standby pin\n");
+	}
+
 	dev_info(&pdev->dev, "device registered (regs @ %p, IRQ%d)\n",
 		 priv->regs, ndev->irq);
 
diff --git a/include/linux/can/platform/rcar_can.h b/include/linux/can/platform/rcar_can.h
index 0f4a2f3..7ef810d 100644
--- a/include/linux/can/platform/rcar_can.h
+++ b/include/linux/can/platform/rcar_can.h
@@ -12,6 +12,8 @@ enum CLKR {
 
 struct rcar_can_platform_data {
 	enum CLKR clock_select;	/* Clock source select */
+	unsigned int enable_pin;
+	unsigned int standby_pin;
 };
 
 #endif	/* !_CAN_PLATFORM_RCAR_CAN_H_ */
-- 
1.9.1