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gpio: Fix ngpio in gpio-xilinx driver

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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 <gvormayr@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Gernot Vormayr 2014-09-24 00:58:45 +02:00 committed by Linus Walleij
parent 58a3b92d33
commit 1b4c5a6e6b
1 changed files with 15 additions and 12 deletions
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27
drivers/gpio/gpio-xilinx.c
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@ -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 +212,13 @@ 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 +260,13 @@ 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);