[PATCH] spi: ti_qspi: Fix "spi-max-frequency" error path in ti_qspi_ofdata_to_platdata

[Ovidiu Panait]

struct ti_qspi_priv->max_hz is declared as unsigned int, so the following
error path check will always be false, even when "spi-max-frequency"
property is invalid/missing:
  priv->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", -1);
  if (priv->max_hz < 0) {
    ...
  }

Replace the fdtdec call with dev_read_u32_default() and use 0 as the
default value. Error out if max_hz is zero.

Signed-off-by: Ovidiu Panait <ovidiu.panait at windriver.com>
---

 drivers/spi/ti_qspi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
index 5fdbb49442..91be18e0a7 100644
--- a/drivers/spi/ti_qspi.c
+++ b/drivers/spi/ti_qspi.c
@@ -467,8 +467,8 @@ static int ti_qspi_ofdata_to_platdata(struct udevice *bus)
 	priv->memory_map = map_physmem(mmap_addr, mmap_size, MAP_NOCACHE);
 	priv->mmap_size = mmap_size;
 
-	priv->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", -1);
-	if (priv->max_hz < 0) {
+	priv->max_hz = dev_read_u32_default(bus, "spi-max-frequency", 0);
+	if (!priv->max_hz) {
 		debug("Error: Max frequency missing\n");
 		return -ENODEV;
 	}
-- 
2.17.1