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Message-ID: <1357629535-26033-4-git-send-email-acourbot@nvidia.com>
Date: Tue, 8 Jan 2013 16:18:54 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Grant Likely <grant.likely@...retlab.ca>,
Linus Walleij <linus.walleij@...aro.org>,
Arnd Bergmann <arnd@...db.de>
CC: Guenter Roeck <linux@...ck-us.net>, <linux-kernel@...r.kernel.org>,
<linux-arch@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<devicetree-discuss@...ts.ozlabs.org>,
Alexandre Courbot <gnurou@...il.com>,
Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 3/4] gpiolib: of: convert OF helpers to descriptor API
Convert gpiolib-of.c's internals to rely on descriptors instead of
integers and add the gpiod_ counterparts of existing OF functions.
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
drivers/gpio/gpiolib-of.c | 26 +++++++++------
include/linux/gpio/consumer.h | 56 +++++++++++++++++++++++++++++++++
include/linux/gpio/driver.h | 38 ++++++++++++++++++++++
include/linux/of_gpio.h | 73 ++++++-------------------------------------
4 files changed, 120 insertions(+), 73 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index d542a14..8c9f8c5 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio.h>
@@ -22,12 +23,14 @@
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
+struct gpio_desc;
+
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
enum of_gpio_flags *flags;
struct of_phandle_args gpiospec;
- int out_gpio;
+ struct gpio_desc *out_gpio;
};
/* Private function for resolving node pointer to gpio_chip */
@@ -45,28 +48,31 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
if (ret < 0)
return false;
- gg_data->out_gpio = ret + gc->base;
+ gg_data->out_gpio = gpio_to_desc(ret + gc->base);
return true;
}
/**
- * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
+ * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
* @np: device node to get GPIO from
* @propname: property name containing gpio specifier(s)
* @index: index of the GPIO
* @flags: a flags pointer to fill in
*
- * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
* value on the error condition. If @flags is not NULL the function also fills
* in flags for the GPIO.
*/
-int of_get_named_gpio_flags(struct device_node *np, const char *propname,
- int index, enum of_gpio_flags *flags)
+struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+ const char *propname, int index, enum of_gpio_flags *flags)
{
/* Return -EPROBE_DEFER to support probe() functions to be called
* later when the GPIO actually becomes available
*/
- struct gg_data gg_data = { .flags = flags, .out_gpio = -EPROBE_DEFER };
+ struct gg_data gg_data = {
+ .flags = flags,
+ .out_gpio = ERR_PTR(-EPROBE_DEFER),
+ };
int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */
@@ -77,13 +83,15 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
&gg_data.gpiospec);
if (ret) {
pr_debug("%s: can't parse gpios property\n", __func__);
- return ret;
+ return ERR_PTR(ret);
}
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
of_node_put(gg_data.gpiospec.np);
- pr_debug("%s exited with status %d\n", __func__, gg_data.out_gpio);
+
+ ret = PTR_RET(gg_data.out_gpio);
+ pr_debug("%s exited with status %d\n", __func__, ret);
return gg_data.out_gpio;
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 2f30761..b6a3bc8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -3,6 +3,8 @@
#ifdef CONFIG_GPIOLIB
+#include <linux/kernel.h>
+
struct device;
struct gpio_chip;
@@ -67,6 +69,60 @@ static inline void gpiod_unexport(struct gpio_desc *desc)
#endif /* CONFIG_GPIO_SYSFS */
+
+struct device_node;
+
+/*
+ * This is Linux-specific flags. By default controllers' and Linux' mapping
+ * match, but GPIO controllers are free to translate their own flags to
+ * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
+ */
+enum of_gpio_flags {
+ OF_GPIO_ACTIVE_LOW = 0x1,
+};
+
+#ifdef CONFIG_OF_GPIO
+
+extern unsigned int of_gpio_named_count(struct device_node *np,
+ const char *propname);
+
+extern struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+ const char *list_name, int index, enum of_gpio_flags *flags);
+
+#else
+
+/* Drivers may not strictly depend on the GPIO support, so let them link. */
+static inline unsigned int of_gpio_named_count(struct device_node *np,
+ const char *propname)
+{
+ return 0;
+}
+
+static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+ const char *list_name, int index, enum of_gpio_flags *flags)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+#endif /* CONFIG_OF_GPIO */
+
+static inline struct gpio_desc *of_get_gpiod_flags(struct device_node *np,
+ int index, enum of_gpio_flags *flags)
+{
+ return of_get_named_gpiod_flags(np, "gpios", index, flags);
+}
+
+static inline struct gpio_desc *of_get_named_gpiod(struct device_node *np,
+ const char *propname, int index)
+{
+ return of_get_named_gpiod_flags(np, propname, index, NULL);
+}
+
+static inline struct gpio_desc *of_get_gpiod(struct device_node *np, int index)
+{
+ return of_get_gpiod_flags(np, index, NULL);
+}
+
#endif /* CONFIG_GPIOLIB */
#endif
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index d43d671..84447a5 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -128,6 +128,44 @@ struct gpiod_lookup {
void gpiod_add_table(struct gpiod_lookup *table, size_t size);
+#ifdef CONFIG_OF_GPIO
+
+/*
+ * OF GPIO chip for memory mapped banks
+ */
+struct of_mm_gpio_chip {
+ struct gpio_chip gc;
+ void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
+ void __iomem *regs;
+};
+
+static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
+{
+ return container_of(gc, struct of_mm_gpio_chip, gc);
+}
+
+extern int of_mm_gpiochip_add(struct device_node *np,
+ struct of_mm_gpio_chip *mm_gc);
+extern void of_gpiochip_add(struct gpio_chip *gc);
+extern void of_gpiochip_remove(struct gpio_chip *gc);
+extern int of_gpio_simple_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags);
+
+#else
+
+static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags)
+{
+ return -ENOSYS;
+}
+
+static inline void of_gpiochip_add(struct gpio_chip *gc) { }
+static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
+
+#endif /* CONFIG_OF_GPIO */
+
#endif /* CONFIG_GPIOLIB */
#endif
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index c454f57..f703707 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -17,78 +17,23 @@
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/of.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
-struct device_node;
-
-/*
- * This is Linux-specific flags. By default controllers' and Linux' mapping
- * match, but GPIO controllers are free to translate their own flags to
- * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
- */
-enum of_gpio_flags {
- OF_GPIO_ACTIVE_LOW = 0x1,
-};
-
-#ifdef CONFIG_OF_GPIO
-
-/*
- * OF GPIO chip for memory mapped banks
- */
-struct of_mm_gpio_chip {
- struct gpio_chip gc;
- void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
- void __iomem *regs;
-};
-
-static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
-{
- return container_of(gc, struct of_mm_gpio_chip, gc);
-}
-
-extern int of_get_named_gpio_flags(struct device_node *np,
- const char *list_name, int index, enum of_gpio_flags *flags);
-
-extern unsigned int of_gpio_named_count(struct device_node *np,
- const char* propname);
-
-extern int of_mm_gpiochip_add(struct device_node *np,
- struct of_mm_gpio_chip *mm_gc);
-
-extern void of_gpiochip_add(struct gpio_chip *gc);
-extern void of_gpiochip_remove(struct gpio_chip *gc);
-extern int of_gpio_simple_xlate(struct gpio_chip *gc,
- const struct of_phandle_args *gpiospec,
- u32 *flags);
-
-#else /* CONFIG_OF_GPIO */
-
-/* Drivers may not strictly depend on the GPIO support, so let them link. */
static inline int of_get_named_gpio_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags)
{
- return -ENOSYS;
-}
-
-static inline unsigned int of_gpio_named_count(struct device_node *np,
- const char* propname)
-{
- return 0;
-}
-
-static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
- const struct of_phandle_args *gpiospec,
- u32 *flags)
-{
- return -ENOSYS;
+ struct gpio_desc *desc;
+ desc = of_get_named_gpiod_flags(np, list_name, index, flags);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+ else
+ return desc_to_gpio(desc);
}
-static inline void of_gpiochip_add(struct gpio_chip *gc) { }
-static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
-
-#endif /* CONFIG_OF_GPIO */
-
/**
* of_gpio_count - Count GPIOs for a device
* @np: device node to count GPIOs for
--
1.8.1
--
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