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Date: Thu, 30 Oct 2008 19:03:09 -0700
From: Trent Piepho <tpiepho@...escale.com>
To: linux-kernel@...r.kernel.org
Cc: linuxppc-dev@...abs.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Grant Likely <grant.likely@...retlab.ca>,
Anton Vorontsov <avorontsov@...mvista.com>,
Trent Piepho <tpiepho@...escale.com>
Subject: [PATCH v2] of_gpio: Return GPIO flags from of_get_gpio()
The device binding spec for OF GPIOs defines a flags field, but there is
currently no way to get it. This patch adds a parameter to of_get_gpio()
where the flags will be returned if non-NULL. of_get_gpio() in turn passes
the parameter to the of_gpio_chip's xlate method, which can extract any
flags present from the gpio_spec.
The default (and currently only) of_gpio_chip xlate method,
of_gpio_simple_xlate(), is modified to do this.
Signed-off-by: Trent Piepho <tpiepho@...escale.com>
Acked-by: Grant Likely <grant.likely@...retlab.ca>
Acked-by: Anton Vorontsov <avorontsov@...mvista.com>
---
Since this patch changes an API, it would be nice to get it into powerpc-next
soon so that people who have new patches that use this API, like Anton, can
base off it.
drivers/mtd/nand/fsl_upm.c | 2 +-
drivers/net/fs_enet/fs_enet-main.c | 2 +-
drivers/net/phy/mdio-ofgpio.c | 4 ++--
drivers/of/gpio.c | 13 ++++++++++---
drivers/serial/cpm_uart/cpm_uart_core.c | 2 +-
include/linux/of_gpio.h | 21 +++++++++++++++++----
6 files changed, 32 insertions(+), 12 deletions(-)
diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index 024e3ff..a25d962 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -218,7 +218,7 @@ static int __devinit fun_probe(struct of_device *ofdev,
}
fun->upm_cmd_offset = *prop;
- fun->rnb_gpio = of_get_gpio(ofdev->node, 0);
+ fun->rnb_gpio = of_get_gpio(ofdev->node, 0, NULL);
if (fun->rnb_gpio >= 0) {
ret = gpio_request(fun->rnb_gpio, ofdev->dev.bus_id);
if (ret) {
diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
index cb51c1f..5a3c7ee 100644
--- a/drivers/net/fs_enet/fs_enet-main.c
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -994,7 +994,7 @@ static int __devinit find_phy(struct device_node *np,
goto out_put_phy;
}
- bus_id = of_get_gpio(mdionode, 0);
+ bus_id = of_get_gpio(mdionode, 0, NULL);
if (bus_id < 0) {
struct resource res;
ret = of_address_to_resource(mdionode, 0, &res);
diff --git a/drivers/net/phy/mdio-ofgpio.c b/drivers/net/phy/mdio-ofgpio.c
index 2ff9775..e3757c6 100644
--- a/drivers/net/phy/mdio-ofgpio.c
+++ b/drivers/net/phy/mdio-ofgpio.c
@@ -78,8 +78,8 @@ static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
{
struct mdio_gpio_info *bitbang = bus->priv;
- bitbang->mdc = of_get_gpio(np, 0);
- bitbang->mdio = of_get_gpio(np, 1);
+ bitbang->mdc = of_get_gpio(np, 0, NULL);
+ bitbang->mdio = of_get_gpio(np, 1, NULL);
if (bitbang->mdc < 0 || bitbang->mdio < 0)
return -ENODEV;
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index 7cd7301..ae14215 100644
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -22,11 +22,12 @@
* of_get_gpio - Get a GPIO number from the device tree to use with GPIO API
* @np: device node to get GPIO from
* @index: index of the GPIO
+ * @flags: GPIO's flags are returned here if non-NULL
*
* Returns GPIO number to use with Linux generic GPIO API, or one of the errno
* value on the error condition.
*/
-int of_get_gpio(struct device_node *np, int index)
+int of_get_gpio(struct device_node *np, int index, enum of_gpio_flags *flags)
{
int ret;
struct device_node *gc;
@@ -59,7 +60,9 @@ int of_get_gpio(struct device_node *np, int index)
goto err1;
}
- ret = of_gc->xlate(of_gc, np, gpio_spec);
+ if (flags)
+ *flags = 0;
+ ret = of_gc->xlate(of_gc, np, gpio_spec, flags);
if (ret < 0)
goto err1;
@@ -77,19 +80,23 @@ EXPORT_SYMBOL(of_get_gpio);
* @of_gc: pointer to the of_gpio_chip structure
* @np: device node of the GPIO chip
* @gpio_spec: gpio specifier as found in the device tree
+ * @flags: if non-NULL flags are returned here
*
* This is simple translation function, suitable for the most 1:1 mapped
* gpio chips. This function performs only one sanity check: whether gpio
* is less than ngpios (that is specified in the gpio_chip).
*/
int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, struct device_node *np,
- const void *gpio_spec)
+ const void *gpio_spec, enum of_gpio_flags *flags)
{
const u32 *gpio = gpio_spec;
if (*gpio > of_gc->gc.ngpio)
return -EINVAL;
+ if (flags && of_gc->gpio_cells > 1)
+ *flags = gpio[1];
+
return *gpio;
}
EXPORT_SYMBOL(of_gpio_simple_xlate);
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c
index bde4b4b..7835cd4 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -1094,7 +1094,7 @@ static int cpm_uart_init_port(struct device_node *np,
}
for (i = 0; i < NUM_GPIOS; i++)
- pinfo->gpios[i] = of_get_gpio(np, i);
+ pinfo->gpios[i] = of_get_gpio(np, i, NULL);
return cpm_uart_request_port(&pinfo->port);
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 67db101..d611746 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -20,13 +20,23 @@
#ifdef CONFIG_OF_GPIO
/*
+ * Flags as returned by OF GPIO chip's xlate method.
+ * The GPIO specifier in the OF device tree does not need to use this
+ * same format for its flags, but it's convenient if it does. For
+ * example, the of_mm_gpio_chip driver works this way.
+ */
+enum of_gpio_flags {
+ OF_GPIO_ACTIVE_LOW = 1,
+};
+
+/*
* Generic OF GPIO chip
*/
struct of_gpio_chip {
struct gpio_chip gc;
int gpio_cells;
int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
- const void *gpio_spec);
+ const void *gpio_spec, enum of_gpio_flags *flags);
};
static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
@@ -50,16 +60,19 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
}
-extern int of_get_gpio(struct device_node *np, int index);
+extern int of_get_gpio(struct device_node *np, int index,
+ enum of_gpio_flags *flags);
extern int of_mm_gpiochip_add(struct device_node *np,
struct of_mm_gpio_chip *mm_gc);
extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
struct device_node *np,
- const void *gpio_spec);
+ const void *gpio_spec,
+ enum of_gpio_flags *flags);
#else
/* Drivers may not strictly depend on the GPIO support, so let them link. */
-static inline int of_get_gpio(struct device_node *np, int index)
+static inline int of_get_gpio(struct device_node *np, int index,
+ enum of_gpio_flags *flags)
{
return -ENOSYS;
}
--
1.5.4.3
--
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