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authorJohn Crispin <john@openwrt.org>2013-05-06 16:45:27 +0000
committerJohn Crispin <john@openwrt.org>2013-05-06 16:45:27 +0000
commit4f1ff28f086da25b122cc29c4c468a33eb7ec891 (patch)
tree58f80e455ee958453d321e4e5a9347dbacbbc9c4 /target/linux/ramips
parent6af3b6721b73b786228ae73e41d88af3ce2e53ba (diff)
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ramips: Support setting active_low in devicetree gpio-export
Support setting active_low in devicetree gpio-export. Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de> SVN-Revision: 36563
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch89
1 files changed, 63 insertions, 26 deletions
diff --git a/target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch b/target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch
index efbd0858d6..80d9402b30 100644
--- a/target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch
+++ b/target/linux/ramips/patches-3.8/0209-owrt-GPIO-add-gpio_export_with_name.patch
@@ -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 */