If one adds gpio-controller; to the chip in the devicetree, then initialization fails with 'gpiochip_find_base: cannot find free range', because ngpio is 0. This patch fixes the bug.
This version includes the suggestions from Linus Walleij. Tested on ml507 board. Signed-off-by: Gernot Vormayr <[email protected]> --- drivers/gpio/gpio-xilinx.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index 1248186..c11bc11 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -197,6 +197,7 @@ static int xgpio_of_probe(struct device_node *np) struct xgpio_instance *chip; int status = 0; const u32 *tree_info; + u32 ngpio; chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (!chip) @@ -211,12 +212,11 @@ static int xgpio_of_probe(struct device_node *np) /* Update GPIO direction shadow register with default value */ of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir); - /* By default assume full GPIO controller */ - chip->mmchip.gc.ngpio = 32; - - /* Check device node and parent device node for device width */ - of_property_read_u32(np, "xlnx,gpio-width", - (u32 *)&chip->mmchip.gc.ngpio); + /* Check device node and parent device node for device width + and assume default width of 32 */ + if (of_property_read_u32(np, "xlnx,gpio-width", &ngpio)) + ngpio = 32; + chip->mmchip.gc.ngpio = (u16)ngpio; spin_lock_init(&chip->gpio_lock); @@ -258,12 +258,11 @@ static int xgpio_of_probe(struct device_node *np) /* Update GPIO direction shadow register with default value */ of_property_read_u32(np, "xlnx,tri-default-2", &chip->gpio_dir); - /* By default assume full GPIO controller */ - chip->mmchip.gc.ngpio = 32; - - /* Check device node and parent device node for device width */ - of_property_read_u32(np, "xlnx,gpio2-width", - (u32 *)&chip->mmchip.gc.ngpio); + /* Check device node and parent device node for device width + and assume default width of 32 */ + if (of_property_read_u32(np, "xlnx,gpio2-width", &ngpio)) + ngpio = 32; + chip->mmchip.gc.ngpio = (u16)ngpio; spin_lock_init(&chip->gpio_lock); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
