diff options
Diffstat (limited to 'target/linux/bcm63xx/patches-4.19/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch')
| -rw-r--r-- | target/linux/bcm63xx/patches-4.19/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/target/linux/bcm63xx/patches-4.19/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch b/target/linux/bcm63xx/patches-4.19/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch new file mode 100644 index 0000000000..13225beae6 --- /dev/null +++ b/target/linux/bcm63xx/patches-4.19/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch @@ -0,0 +1,134 @@ +From e058fa1969019c2f6705c53c4130e364a877d4e6 Mon Sep 17 00:00:00 2001 +From: Jonas Gorski <jonas.gorski@gmail.com> +Date: Sun, 26 Nov 2017 12:07:31 +0100 +Subject: [PATCH] gpio: fix device tree gpio hogs on dual role gpio/pincontrol + controllers + +For dual role gpio and pincontrol controller, the device registration +path is often: + + pinctrl_register(...); + gpiochip_add_data(...); + gpiochip_add_pin_range(...); + +If the device tree node has any gpio-hogs, the code will try to apply them +in the gpiochip_add_data step, but fail as they cannot be requested, as the +ranges are missing. But we also cannot first add the pinranges, as the +appropriate data structures are only initialized in gpiochip_add_data. + +To fix this, defer gpio-hogs to the time pin ranges get added instead of +directly at chip request time, if the gpio-chip has a request method. + +Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> +--- + + drivers/gpio/gpiolib-of.c | 20 +++++++++++++++----- + drivers/gpio/gpiolib.c | 5 +++-- + drivers/gpio/gpiolib.h | 8 ++++++++ + 3 files changed, 26 insertions(+), 7 deletions(-) + +--- a/drivers/gpio/gpiolib-of.c ++++ b/drivers/gpio/gpiolib-of.c +@@ -363,12 +363,15 @@ static struct gpio_desc *of_parse_own_gp + /** + * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions + * @chip: gpio chip to act on ++ * @start: first gpio to check ++ * @num: number of gpios to check + * +- * This is only used by of_gpiochip_add to request/set GPIO initial +- * configuration. ++ * This is used by of_gpiochip_add, gpiochip_add_pingroup_range and ++ * gpiochip_add_pin_range to request/set GPIO initial configuration. + * It returns error if it fails otherwise 0 on success. + */ +-static int of_gpiochip_scan_gpios(struct gpio_chip *chip) ++int of_gpiochip_scan_gpios(struct gpio_chip *chip, unsigned int start, ++ unsigned int num) + { + struct gpio_desc *desc = NULL; + struct device_node *np; +@@ -376,7 +379,7 @@ static int of_gpiochip_scan_gpios(struct + enum gpio_lookup_flags lflags; + enum gpiod_flags dflags; + unsigned int i; +- int ret; ++ int ret, hwgpio; + + for_each_available_child_of_node(chip->of_node, np) { + if (!of_property_read_bool(np, "gpio-hog")) +@@ -388,6 +391,10 @@ static int of_gpiochip_scan_gpios(struct + if (IS_ERR(desc)) + break; + ++ hwgpio = gpio_chip_hwgpio(desc); ++ if (hwgpio < start || hwgpio >= (start + num)) ++ continue; ++ + ret = gpiod_hog(desc, name, lflags, dflags); + if (ret < 0) { + of_node_put(np); +@@ -646,12 +653,13 @@ int of_gpiochip_add(struct gpio_chip *ch + + of_node_get(chip->of_node); + +- status = of_gpiochip_scan_gpios(chip); +- if (status) { +- of_node_put(chip->of_node); +- gpiochip_remove_pin_ranges(chip); ++ if (!chip->request) { ++ status = of_gpiochip_scan_gpios(chip, 0, chip->ngpio); ++ if (status) { ++ of_node_put(chip->of_node); ++ gpiochip_remove_pin_ranges(chip); ++ } + } +- + return status; + } + +--- a/drivers/gpio/gpiolib.c ++++ b/drivers/gpio/gpiolib.c +@@ -2205,7 +2205,8 @@ int gpiochip_add_pingroup_range(struct g + + list_add_tail(&pin_range->node, &gdev->pin_ranges); + +- return 0; ++ return of_gpiochip_scan_gpios(chip, gpio_offset, ++ pin_range->range.npins); + } + EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); + +@@ -2262,7 +2263,7 @@ int gpiochip_add_pin_range(struct gpio_c + + list_add_tail(&pin_range->node, &gdev->pin_ranges); + +- return 0; ++ return of_gpiochip_scan_gpios(chip, gpio_offset, npins); + } + EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); + +--- a/drivers/gpio/gpiolib.h ++++ b/drivers/gpio/gpiolib.h +@@ -103,6 +103,8 @@ struct gpio_desc *of_get_named_gpiod_fla + const char *list_name, int index, enum of_gpio_flags *flags); + int of_gpiochip_add(struct gpio_chip *gc); + void of_gpiochip_remove(struct gpio_chip *gc); ++int of_gpiochip_scan_gpios(struct gpio_chip *chip, unsigned int start, ++ unsigned int num); + #else + static inline struct gpio_desc *of_find_gpio(struct device *dev, + const char *con_id, +@@ -118,6 +120,12 @@ static inline struct gpio_desc *of_get_n + } + static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; } + static inline void of_gpiochip_remove(struct gpio_chip *gc) { } ++static inline int of_gpiochip_scan_gpios(struct gpio_chip *chip, ++ unsigned int start, ++ unsigned int num) ++{ ++ return 0; ++} + #endif /* CONFIG_OF_GPIO */ + + #ifdef CONFIG_ACPI |