@@ -60,6 +60,8 @@ o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
#include <linux/of.h>
#include <linux/of_device.h>
+#include "gpiolib.h"
+
static void bgpio_write8(void __iomem *reg, unsigned long data)
{
writeb(data, reg);
@@ -614,10 +616,15 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev,
gc->parent = dev;
gc->label = dev_name(dev);
gc->base = -1;
- gc->ngpio = gc->bgpio_bits;
gc->request = bgpio_request;
gc->be_bits = !!(flags & BGPIOF_BIG_ENDIAN);
+ ret = gpiochip_get_ngpios(gc, dev);
+ if (ret)
+ gc->ngpio = gc->bgpio_bits;
+ else
+ gc->bgpio_bits = roundup_pow_of_two(round_up(gc->ngpio, 8));
+
ret = bgpio_setup_io(gc, dat, set, clr, flags);
if (ret)
return ret;
@@ -700,6 +700,40 @@ void *gpiochip_get_data(struct gpio_chip *gc)
}
EXPORT_SYMBOL_GPL(gpiochip_get_data);
+int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev)
+{
+ u32 ngpios = gc->ngpio;
+ int ret;
+
+ if (ngpios == 0) {
+ ret = device_property_read_u32(dev, "ngpios", &ngpios);
+ if (ret == -ENODATA)
+ /*
+ * -ENODATA means that there is no property found and
+ * we want to issue the error message to the user.
+ * Besides that, we want to return different error code
+ * to state that supplied value is not valid.
+ */
+ ngpios = 0;
+ else if (ret)
+ return ret;
+
+ gc->ngpio = ngpios;
+ }
+
+ if (gc->ngpio == 0) {
+ chip_err(gc, "tried to insert a GPIO chip with zero lines\n");
+ return -EINVAL;
+ }
+
+ if (gc->ngpio > FASTPATH_NGPIO)
+ chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n",
+ gc->ngpio, FASTPATH_NGPIO);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gpiochip_get_ngpios);
+
int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct lock_class_key *lock_key,
struct lock_class_key *request_key)
@@ -707,7 +741,6 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct gpio_device *gdev;
unsigned long flags;
unsigned int i;
- u32 ngpios = 0;
int base = 0;
int ret = 0;
@@ -753,36 +786,9 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
else
gdev->owner = THIS_MODULE;
- /*
- * Try the device properties if the driver didn't supply the number
- * of GPIO lines.
- */
- ngpios = gc->ngpio;
- if (ngpios == 0) {
- ret = device_property_read_u32(&gdev->dev, "ngpios", &ngpios);
- if (ret == -ENODATA)
- /*
- * -ENODATA means that there is no property found and
- * we want to issue the error message to the user.
- * Besides that, we want to return different error code
- * to state that supplied value is not valid.
- */
- ngpios = 0;
- else if (ret)
- goto err_free_dev_name;
-
- gc->ngpio = ngpios;
- }
-
- if (gc->ngpio == 0) {
- chip_err(gc, "tried to insert a GPIO chip with zero lines\n");
- ret = -EINVAL;
+ ret = gpiochip_get_ngpios(gc, &gdev->dev);
+ if (ret)
goto err_free_dev_name;
- }
-
- if (gc->ngpio > FASTPATH_NGPIO)
- chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n",
- gc->ngpio, FASTPATH_NGPIO);
gdev->descs = kcalloc(gc->ngpio, sizeof(*gdev->descs), GFP_KERNEL);
if (!gdev->descs) {
@@ -947,7 +953,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
/* failures here can mean systems won't boot... */
if (ret != -EPROBE_DEFER) {
pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
- base, base + (int)ngpios - 1,
+ base, base + (int)gc->ngpio - 1,
gc->label ? : "generic", ret);
}
return ret;
@@ -217,6 +217,7 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);
int gpiod_hog(struct gpio_desc *desc, const char *name,
unsigned long lflags, enum gpiod_flags dflags);
+int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev);
/*
* Return the GPIO number of the passed descriptor relative to its chip
bgpio_init() uses "sz" argument to populate ngpio, which is not accurate. Instead, read the "ngpios" property from the DT and if it doesn't exist, use the "sz" argument. With this change, drivers no longer need to overwrite the ngpio variable after calling bgpio_init(). If the "ngpios" property is specified, bgpio_bits is calculated as the round up value of ngpio. At the moment, the only requirement specified is that the round up value must be a multiple of 8 but it should also be a power of 2 because we provide accessors based on the bank size in bgpio_setup_accessors(). The following 2 patches were approved in the past but didn't make it into the tree. I combined them into one patch since the second one fixes a bug in the first one: [PATCH v4] gpio: mmio: handle "ngpios" properly in bgpio_init() [PATCH v1] gpio: mmio: fix calculation of bgpio_bits Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com> --- drivers/gpio/gpio-mmio.c | 9 +++++- drivers/gpio/gpiolib.c | 68 ++++++++++++++++++++++------------------ drivers/gpio/gpiolib.h | 1 + 3 files changed, 46 insertions(+), 32 deletions(-)