From 28355f81969962cf01aef5b13d7de5b4ab0c5f13 Mon Sep 17 00:00:00 2001 From: Tomeu Vizoso Date: Tue, 14 Jul 2015 10:29:54 +0200 Subject: gpio: defer probe if pinctrl cannot be found When an OF node has a pin range for its GPIOs, return -EPROBE_DEFER if the pin controller isn't available. Otherwise, the GPIO range wouldn't be set at all unless the pin controller probed always before the GPIO chip. With this change, the probe of the GPIO chip will be deferred and will be retried at a later point, hopefully once the pin controller has been registered and probed already. Signed-off-by: Tomeu Vizoso Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib-of.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) (limited to 'drivers/gpio/gpiolib-of.c') diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 1e36ec5..fa6e3c8 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -335,7 +335,7 @@ void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) EXPORT_SYMBOL(of_mm_gpiochip_remove); #ifdef CONFIG_PINCTRL -static void of_gpiochip_add_pin_range(struct gpio_chip *chip) +static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { struct device_node *np = chip->of_node; struct of_phandle_args pinspec; @@ -346,7 +346,7 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip) struct property *group_names; if (!np) - return; + return 0; group_names = of_find_property(np, group_names_propname, NULL); @@ -358,7 +358,7 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip) pctldev = of_pinctrl_get(pinspec.np); if (!pctldev) - break; + return -EPROBE_DEFER; if (pinspec.args[2]) { if (group_names) { @@ -378,7 +378,7 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip) pinspec.args[1], pinspec.args[2]); if (ret) - break; + return ret; } else { /* npins == 0: special range */ if (pinspec.args[1]) { @@ -408,32 +408,41 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip) ret = gpiochip_add_pingroup_range(chip, pctldev, pinspec.args[0], name); if (ret) - break; + return ret; } } + + return 0; } #else -static void of_gpiochip_add_pin_range(struct gpio_chip *chip) {} +static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } #endif -void of_gpiochip_add(struct gpio_chip *chip) +int of_gpiochip_add(struct gpio_chip *chip) { + int status; + if ((!chip->of_node) && (chip->dev)) chip->of_node = chip->dev->of_node; if (!chip->of_node) - return; + return 0; if (!chip->of_xlate) { chip->of_gpio_n_cells = 2; chip->of_xlate = of_gpio_simple_xlate; } - of_gpiochip_add_pin_range(chip); + status = of_gpiochip_add_pin_range(chip); + if (status) + return status; + of_node_get(chip->of_node); of_gpiochip_scan_hogs(chip); + + return 0; } void of_gpiochip_remove(struct gpio_chip *chip) -- cgit v1.1