From 3ff7e5c8369180d3e399a67a2170700fe902d5a5 Mon Sep 17 00:00:00 2001 From: Andrey Gusakov Date: Mon, 26 Mar 2018 15:11:28 +0300 Subject: 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. --- .../0108-can-mcp251x-add-reset-gpio-support.patch | 72 ++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0108-can-mcp251x-add-reset-gpio-support.patch (limited to 'meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0108-can-mcp251x-add-reset-gpio-support.patch') 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 +Date: Mon, 26 Mar 2018 13:51:49 +0300 +Subject: [PATCH] can: mcp251x: add reset gpio support + +Signed-off-by: Andrey Gusakov +--- + 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 + #include + #include ++#include + #include + #include + #include +@@ -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 + -- cgit 1.2.3-korg