diff options
Diffstat (limited to 'meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch')
| -rw-r--r-- | meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch new file mode 100644 index 0000000..38d8e09 --- /dev/null +++ b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0010-can-rcar_can-add-enable-and-standby-control-pins.patch @@ -0,0 +1,156 @@ +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 + |