[PATCH v1] spi: npcm_pspi: Reset HW in driver probe

[Jim Liu]

Reset HW to clear old status and use default data mode(8-bit).

Signed-off-by: Jim Liu <JJLIU0 at nuvoton.com>
---
 drivers/spi/npcm_pspi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/spi/npcm_pspi.c b/drivers/spi/npcm_pspi.c
index eb14185273..c9441304f5 100644
--- a/drivers/spi/npcm_pspi.c
+++ b/drivers/spi/npcm_pspi.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <spi.h>
 #include <clk.h>
+#include <reset.h>
 #include <asm/gpio.h>
 #include <linux/iopoll.h>
 
@@ -194,6 +195,7 @@ static int npcm_pspi_probe(struct udevice *bus)
 {
 	struct npcm_pspi_priv *priv = dev_get_priv(bus);
 	int node = dev_of_offset(bus);
+	struct reset_ctl reset;
 	int ret;
 
 	ret = clk_get_by_index(bus, 0, &priv->clk);
@@ -205,6 +207,14 @@ static int npcm_pspi_probe(struct udevice *bus)
 	gpio_request_by_name_nodev(offset_to_ofnode(node), "cs-gpios", 0,
 				   &priv->cs_gpio, GPIOD_IS_OUT| GPIOD_ACTIVE_LOW);
 
+	/* Reset HW */
+	ret = reset_get_by_index(bus, 0, &reset);
+	if (!ret) {
+		reset_assert(&reset);
+		udelay(5);
+		reset_deassert(&reset);
+	}
+
 	return 0;
 }
 
-- 
2.25.1