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---
description: Feature agl-sota
authors: Anton Gerasimov <anton@advancedtelematic.com>, Changhyeok Bae <changhyeok.bae@gmail.com>, Jan-Simon Moeller <jsmoeller@linuxfoundation.org>, Jan-Simon Möller <jsmoeller@linuxfoundation.org>, Leon Anavi <leon.anavi@konsulko.com>, Phil Wise <phil@advancedtelematic.com>, Ronan Le Martret <ronan.lemartret@iot.bzh>
---
	
### Feature agl-sota
	 
*Description is missing - please complete file meta-agl/templates/feature/agl-sota/README_feature_agl-sota.md*
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From 0f55d888c83aed7ea5a10761edaff52de8dc06a1 Mon Sep 17 00:00:00 2001
From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Date: Mon, 30 May 2016 01:51:47 +0300
Subject: [PATCH] can: rcar_canfd: 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_canfd.txt     |  5 +++
 drivers/net/can/rcar/rcar_canfd.c                       | 48 ++++++++++++++++++----
 2 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/rcar_canfd.txt b/Documentation/devicetree/bindings/net/can/rcar_canfd.txt
index 4299bd8..eede77a 100644
--- a/Documentation/devicetree/bindings/net/can/rcar_canfd.txt
+++ b/Documentation/devicetree/bindings/net/can/rcar_canfd.txt
@@ -16,6 +16,7 @@ Required properties:
 - clock-names: 3 clock input name strings: "fck", "canfd", "can_clk".
 - pinctrl-0: pin control group to be used for this controller.
 - pinctrl-names: must be "default".
+- gpios: GPIO used for controlling the enable pin and standby pin
 
 Required child nodes:
 The controller supports two channels and each is represented as a child node.
@@ -49,6 +50,10 @@ SoC common .dtsi file:
 			power-domains = <&cpg>;
 			status = "disabled";
 
+			gpios = <&gpio5 29 GPIO_ACTIVE_HIGH /* enable */
+				 &gpio5 30 GPIO_ACTIVE_LOW /* standby */
+				>;
+
 			channel0 {
 				status = "disabled";
 			};
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 15a14c5..4aa670d 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/iopoll.h>
@@ -386,6 +387,8 @@ struct rcar_canfd_global {
 	enum rcar_canfd_fcanclk fcan;	/* CANFD or Ext clock */
 	unsigned long channels_mask;	/* Enabled channels mask */
 	bool fdmode;			/* CAN FD or Classical CAN only mode */
+	unsigned int enable_pin;	/* transceiver enable */
+	unsigned int standby_pin;	/* transceiver standby */
 };
 
 /* CAN FD mode nominal rate constants */
@@ -1063,6 +1066,10 @@ static int rcar_canfd_open(struct net_device *ndev)
 	struct rcar_canfd_global *gpriv = priv->gpriv;
 	int err;
 
+	/* transceiver normal mode */
+	if (gpio_is_valid(gpriv->standby_pin))
+		gpio_set_value(gpriv->standby_pin, 1);
+
 	/* Peripheral clock is already enabled in probe */
 	err = clk_prepare_enable(gpriv->can_clk);
 	if (err) {
@@ -1131,6 +1138,9 @@ static int rcar_canfd_close(struct net_device *ndev)
 	clk_disable_unprepare(gpriv->can_clk);
 	close_candev(ndev);
 	can_led_event(ndev, CAN_LED_EVENT_STOP);
+	/* transceiver stanby mode */
+	if (gpio_is_valid(gpriv->standby_pin))
+		gpio_set_value(gpriv->standby_pin, 0);
 	return 0;
 }
 
@@ -1409,8 +1419,9 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	struct rcar_canfd_global *gpriv;
 	struct device_node *of_child;
 	unsigned long channels_mask = 0;
-	int err, ch_irq, g_irq;
+	int err, ret, ch_irq, g_irq;
 	bool fdmode = true;			/* CAN FD only mode - default */
+	enum of_gpio_flags enable_flags, standby_flags;
 
 	if (of_property_read_bool(pdev->dev.of_node, "renesas,no-can-fd"))
 		fdmode = false;			/* Classical CAN only mode */
@@ -1552,6 +1555,26 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 			goto fail_channel;
 	}
 
+	gpriv->enable_pin = of_get_gpio_flags(pdev->dev.of_node, 0, &enable_flags);
+	gpriv->standby_pin = of_get_gpio_flags(pdev->dev.of_node, 1, &standby_flags);
+
+	if (gpio_is_valid(gpriv->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, gpriv->enable_pin, val, "enable");
+		if (ret)
+			dev_info(&pdev->dev, "Failed to request enable pin\n");
+	}
+
+	if (gpio_is_valid(gpriv->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, gpriv->standby_pin, val, "standby");
+		if (ret)
+			dev_info(&pdev->dev, "Failed to request standby pin\n");
+	}
+
 	platform_set_drvdata(pdev, gpriv);
 	dev_info(&pdev->dev, "global operational state (clk %d, fdmode %d)\n",
 		 gpriv->fcan, gpriv->fdmode);
-- 
1.9.1