VB2: fix can2 and can3 coldstart probe fail

Reset pins of external mcp251x can adapters are driven by i2c gpio
extender pins which is probed later than mcp251x. So at probe time
reset pins are low causing probe fail.
Add reset-gpio support to driver. Adjust VB2 dtb.

1 files changed, 72 insertions, 0 deletions

diff --git a/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0108-can-mcp251x-add-reset-gpio-support.patch b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0108-can-mcp251x-add-reset-gpio-support.patch
new file mode 100644
index 0000000..646aa0c
--- /dev/null
+++ b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0108-can-mcp251x-add-reset-gpio-support.patch
@@ -0,0 +1,72 @@
+From b69e3fdc91fbc88cc32eb6794872e1f058681b04 Mon Sep 17 00:00:00 2001
+From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
+Date: Mon, 26 Mar 2018 13:51:49 +0300
+Subject: [PATCH] can: mcp251x: add reset gpio support
+
+Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
+---
+ drivers/net/can/spi/mcp251x.c | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
+index f3f05fe..ac78ce3 100644
+--- a/drivers/net/can/spi/mcp251x.c
++++ b/drivers/net/can/spi/mcp251x.c
+@@ -71,6 +71,7 @@
+ #include <linux/netdevice.h>
+ #include <linux/of.h>
+ #include <linux/of_device.h>
++#include <linux/of_gpio.h>
+ #include <linux/platform_device.h>
+ #include <linux/slab.h>
+ #include <linux/spi/spi.h>
+@@ -270,6 +271,7 @@ struct mcp251x_priv {
+ 	struct regulator *power;
+ 	struct regulator *transceiver;
+ 	struct clk *clk;
++	struct gpio_desc *rst;
+ };
+ 
+ #define MCP251X_IS(_model) \
+@@ -1031,9 +1033,21 @@ static int mcp251x_can_probe(struct spi_device *spi)
+ 	struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
+ 	struct net_device *net;
+ 	struct mcp251x_priv *priv;
++	struct gpio_desc *reset_gpio;
+ 	struct clk *clk;
+ 	int freq, ret;
+ 
++	reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
++	if (IS_ERR(reset_gpio)) {
++		if (PTR_ERR(reset_gpio) == -EPROBE_DEFER)
++			return -EPROBE_DEFER;
++		dev_err(&spi->dev, "cannot get reset-gpios %ld\n",
++			PTR_ERR(reset_gpio));
++		reset_gpio = NULL;
++	} else {
++		gpiod_set_value_cansleep(reset_gpio, 1);
++	}
++
+ 	clk = devm_clk_get(&spi->dev, NULL);
+ 	if (IS_ERR(clk)) {
+ 		if (pdata)
+@@ -1074,6 +1088,7 @@ static int mcp251x_can_probe(struct spi_device *spi)
+ 		priv->model = spi_get_device_id(spi)->driver_data;
+ 	priv->net = net;
+ 	priv->clk = clk;
++	priv->rst = reset_gpio;
+ 
+ 	spi_set_drvdata(spi, priv);
+ 
+@@ -1185,6 +1200,8 @@ static int mcp251x_can_remove(struct spi_device *spi)
+ 
+ 	mcp251x_power_enable(priv->power, 0);
+ 
++	gpiod_set_value_cansleep(priv->rst, 0);
++
+ 	if (!IS_ERR(priv->clk))
+ 		clk_disable_unprepare(priv->clk);
+ 
+-- 
+1.9.1
+