gpio: Make of_count_named_gpios() use new of_count_phandle_with_args()

This patch replaces the horribly coded of_count_named_gpios() with a
call to of_count_phandle_with_args() which is far more efficient. This
also changes the return value of of_gpio_count() & of_gpio_named_count()
from 'unsigned int' to 'int' so that it can return an error code. All
the users of that function are fixed up to correctly handle a negative
return value.

v2: Split GPIO portion into a separate patch

Tested-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 1a7f6359d998..086a9eef2e05 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -947,12 +947,12 @@ static int of_fsl_spi_get_chipselects(struct device *dev)
         struct device_node *np = dev->of_node;
         struct fsl_spi_platform_data *pdata = dev->platform_data;
         struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
-        unsigned int ngpios;
+        int ngpios;
         int i = 0;
         int ret;
 
         ngpios = of_gpio_count(np);
-        if (!ngpios) {
+        if (ngpios <= 0) {
                 /*
                  * SPI w/o chip-select line. One SPI device is still permitted
                  * though.