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ramips: Support setting active_low in devicetree gpio-export

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Support setting active_low in devicetree gpio-export.

Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de>

SVN-Revision: 36563
This commit is contained in:
John Crispin 2013-05-06 16:45:27 +00:00
parent 6af3b6721b
commit 4f1ff28f08
1 changed files with 63 additions and 26 deletions
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89
target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch
View file

@ -14,9 +14,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
include/linux/gpio.h | 23 ++++++++-
5 files changed, 160 insertions(+), 8 deletions(-)
--- a/Documentation/devicetree/bindings/gpio/gpio.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio.txt
@@ -112,3 +112,63 @@ where,
Index: linux-3.8.11/Documentation/devicetree/bindings/gpio/gpio.txt
===================================================================
--- linux-3.8.11.orig/Documentation/devicetree/bindings/gpio/gpio.txt 2013-05-01 18:56:10.000000000 +0200
+++ linux-3.8.11/Documentation/devicetree/bindings/gpio/gpio.txt 2013-05-06 12:43:38.252652605 +0200
@@ -112,3 +112,63 @@
The pinctrl node must have "#gpio-range-cells" property to show number of
arguments to pass with phandle from gpio controllers node.
@ -80,8 +82,10 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ gpio-export,output = <1>;
+ };
+};
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
Index: linux-3.8.11/drivers/gpio/gpiolib-of.c
===================================================================
--- linux-3.8.11.orig/drivers/gpio/gpiolib-of.c 2013-05-01 18:56:10.000000000 +0200
+++ linux-3.8.11/drivers/gpio/gpiolib-of.c 2013-05-06 13:35:56.452788709 +0200
@@ -21,6 +21,8 @@
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
@ -91,7 +95,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
@@ -288,3 +290,62 @@ void of_gpiochip_remove(struct gpio_chip
@@ -288,3 +290,69 @@
if (chip->of_node)
of_node_put(chip->of_node);
}
@ -121,16 +125,23 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ max_gpio = of_gpio_count(cnp);
+
+ for (i = 0; i < max_gpio; i++) {
+ gpio = of_get_gpio(cnp, i);
+ if (devm_gpio_request(&pdev->dev, gpio, name ? name : of_node_full_name(np)))
+ continue;
+ unsigned flags = 0;
+ enum of_gpio_flags of_flags;
+
+ gpio = of_get_gpio_flags(cnp, i, &of_flags);
+
+ if (of_flags == OF_GPIO_ACTIVE_LOW)
+ flags |= GPIOF_ACTIVE_LOW;
+
+ if (!of_property_read_u32(cnp, "gpio-export,output", &val))
+ gpio_direction_output(gpio, val);
+ flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ else
+ gpio_direction_input(gpio);
+ flags |= GPIOF_IN;
+
+ dmc = of_property_read_bool(np, "gpio-export,direction_may_change");
+ if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
+ continue;
+
+ dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
+ gpio_export_with_name(gpio, dmc, name);
+ nb++;
+ }
@ -154,9 +165,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ return platform_driver_probe(&gpio_export_driver, of_gpio_export_probe);
+}
+device_initcall(of_gpio_export_init);
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -714,9 +714,10 @@ static struct class gpio_class = {
Index: linux-3.8.11/drivers/gpio/gpiolib.c
===================================================================
--- linux-3.8.11.orig/drivers/gpio/gpiolib.c 2013-05-01 18:56:10.000000000 +0200
+++ linux-3.8.11/drivers/gpio/gpiolib.c 2013-05-06 13:31:35.060777376 +0200
@@ -714,9 +714,10 @@
/**
@ -168,7 +181,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
* Context: arch_initcall or later
*
* When drivers want to make a GPIO accessible to userspace after they
@@ -728,7 +729,7 @@ static struct class gpio_class = {
@@ -728,7 +729,7 @@
*
* Returns zero on success, else an error.
*/
@ -177,7 +190,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
{
unsigned long flags;
struct gpio_desc *desc;
@@ -762,6 +763,8 @@ int gpio_export(unsigned gpio, bool dire
@@ -762,6 +763,8 @@
goto fail_unlock;
}
@ -186,7 +199,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
if (!desc->chip->direction_input || !desc->chip->direction_output)
direction_may_change = false;
spin_unlock_irqrestore(&gpio_lock, flags);
@@ -804,7 +807,7 @@ fail_unlock:
@@ -804,7 +807,7 @@
pr_debug("%s: gpio%d status %d\n", __func__, gpio, status);
return status;
}
@ -195,9 +208,21 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
static int match_export(struct device *dev, void *data)
{
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -204,7 +204,8 @@ void devm_gpio_free(struct device *dev,
@@ -1418,6 +1421,9 @@
if (flags & GPIOF_OPEN_SOURCE)
set_bit(FLAG_OPEN_SOURCE, &gpio_desc[gpio].flags);
+ if (flags & GPIOF_ACTIVE_LOW)
+ set_bit(FLAG_ACTIVE_LOW, &gpio_desc[gpio].flags);
+
if (flags & GPIOF_DIR_IN)
err = gpio_direction_input(gpio);
else
Index: linux-3.8.11/include/asm-generic/gpio.h
===================================================================
--- linux-3.8.11.orig/include/asm-generic/gpio.h 2013-05-01 18:56:10.000000000 +0200
+++ linux-3.8.11/include/asm-generic/gpio.h 2013-05-06 12:43:38.252652605 +0200
@@ -204,7 +204,8 @@
* A sysfs interface can be exported by individual drivers if they want,
* but more typically is configured entirely from userspace.
*/
@ -207,7 +232,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
extern int gpio_export_link(struct device *dev, const char *name,
unsigned gpio);
extern int gpio_sysfs_set_active_low(unsigned gpio, int value);
@@ -249,7 +250,8 @@ struct device;
@@ -249,7 +250,8 @@
/* sysfs support is only available with gpiolib, where it's optional */
@ -217,9 +242,21 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
{
return -ENOSYS;
}
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -189,7 +189,8 @@ static inline void gpio_set_value_cansle
Index: linux-3.8.11/include/linux/gpio.h
===================================================================
--- linux-3.8.11.orig/include/linux/gpio.h 2013-05-01 18:56:10.000000000 +0200
+++ linux-3.8.11/include/linux/gpio.h 2013-05-06 13:32:59.796781050 +0200
@@ -27,6 +27,9 @@
#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
+#define GPIOF_ACTIVE_LOW (1 << 6)
+
+
/**
* struct gpio - a structure describing a GPIO with configuration
* @gpio: the GPIO number
@@ -189,7 +192,8 @@
WARN_ON(1);
}
@ -229,7 +266,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
{
/* GPIO can never have been requested or set as {in,out}put */
WARN_ON(1);
@@ -248,4 +249,24 @@ gpiochip_remove_pin_ranges(struct gpio_c
@@ -248,4 +252,24 @@
#endif /* ! CONFIG_GENERIC_GPIO */