From 914b766a2a6b0f746b2e6fe3bf3d70881e6da610 Mon Sep 17 00:00:00 2001
From: Jim Liu <jim.t90615@gmail.com>
Date: Tue, 23 Apr 2024 14:38:42 +0800
Subject: [PATCH] spi: npcm_pspi: Reset HW in driver probe
Reset HW to clear old status and use default data mode(8-bit).
Signed-off-by: Jim Liu <JJLIU0@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;
}
--
2.39.5