You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.2 KiB
134 lines
4.2 KiB
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);
|
|
@@ -499,12 +506,13 @@ 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
|
|
@@ -1941,7 +1941,8 @@ 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);
|
|
|
|
@@ -1993,7 +1994,7 @@ 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
|
|
|