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authorJonas Gorski <jonas.gorski@gmail.com>2018-02-19 10:18:06 +0100
committerJonas Gorski <jonas.gorski@gmail.com>2018-12-30 13:21:42 +0100
commit6d6127e537cd6aacc7bb553b43b548c75b79d286 (patch)
tree3c4d71d9e6f521836dfb6d724610d43222083b4e /target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch
parent1789202ed454273a80e9652a4e2ee26ad66adc40 (diff)
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brcm63xx: fix gpio hogs on gpio/pinctrl nodes
Work around a chicken/egg issue in registration of dual gpio/pinctrl nodes. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Diffstat (limited to 'target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch')
-rw-r--r--target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch127
1 files changed, 127 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch b/target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch
new file mode 100644
index 0000000000..436f1aa532
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.14/143-gpio-fix-device-tree-gpio-hogs-on-dual-role-gpio-pin.patch
@@ -0,0 +1,127 @@
+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
+@@ -237,12 +237,15 @@ 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;
+@@ -250,7 +253,7 @@ 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"))
+@@ -262,6 +265,10 @@ 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);
+@@ -499,7 +506,10 @@ int of_gpiochip_add(struct gpio_chip *ch
+
+ of_node_get(chip->of_node);
+
+- return of_gpiochip_scan_gpios(chip);
++ if (!chip->request)
++ status = of_gpiochip_scan_gpios(chip, 0, chip->ngpio);
++
++ return status;
+ }
+
+ void of_gpiochip_remove(struct gpio_chip *chip)
+--- a/drivers/gpio/gpiolib.c
++++ b/drivers/gpio/gpiolib.c
+@@ -1938,7 +1938,8 @@ 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);
+
+@@ -1990,7 +1991,7 @@ 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
+@@ -99,6 +99,8 @@ 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,
+@@ -114,6 +116,12 @@ 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