[PATCH 1/2] spi: nxp_fspi: Fix error reporting

[Adam Ford]

On the i.MX8M Mini, ret = clk_set_rate() sets ret to the value of the
rate the clock was able to set.  When checking for errors, it only
checks that it is not NULL.  Since positive numbers are not errors,
only check for negative numbers when handling errors.

Fixes: 383fded70c4f ("spi: nxp_fspi: new driver for the FlexSPI controller")
Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/drivers/spi/nxp_fspi.c b/drivers/spi/nxp_fspi.c
index 006dd04b9e..d74561578a 100644
--- a/drivers/spi/nxp_fspi.c
+++ b/drivers/spi/nxp_fspi.c
@@ -815,7 +815,7 @@ static int nxp_fspi_default_setup(struct nxp_fspi *f)
 
 	/* the default frequency, we will change it later if necessary. */
 	ret = clk_set_rate(&f->clk, 20000000);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ret = nxp_fspi_clk_prep_enable(f);
@@ -906,7 +906,7 @@ static int nxp_fspi_set_speed(struct udevice *bus, uint speed)
 	nxp_fspi_clk_disable_unprep(f);
 
 	ret = clk_set_rate(&f->clk, speed);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ret = nxp_fspi_clk_prep_enable(f);
-- 
2.25.1