[U-Boot] [PATCH 3/4] spi: cadence_qspi: Ensure check for max frequency in place

[Chin Liang See]

Ensure the intended SCLK frequency not exceeding the maximum
frequency. If that happen, SCLK will set to maximum frequency.

Signed-off-by: Chin Liang See <clsee at altera.com>
Cc: Dinh Nguyen <dinguyen at opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux at gmail.com>
Cc: Marek Vasut <marex at denx.de>
Cc: Stefan Roese <sr at denx.de>
Cc: Vikas Manocha <vikas.manocha at st.com>
Cc: Jagannadh Teki <jteki at openedev.com>
Cc: Pavel Machek <pavel at denx.de>
---
 drivers/spi/cadence_qspi.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index a00af87..52c29d5 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -123,6 +123,11 @@ static int cadence_spi_set_speed(struct udevice *bus, uint hz)
 	struct cadence_spi_priv *priv = dev_get_priv(bus);
 	int err;
 
+	if (hz > plat->max_hz) {
+		hz = plat->max_hz;
+		puts("SF: Default to maximum supported SCLK frequency\n");
+	}
+
 	/* Disable QSPI */
 	cadence_qspi_apb_controller_disable(priv->regbase);
 
-- 
1.7.7.4