[PATCH v2 08/11] i2c/aspeed: Fix reset control

[Joel Stanley]

The reset control was written for the ast2500 and directly programs the
clocking register.

So we can share the code with other SoC generations use the reset device
to deassert the I2C reset line.

Signed-off-by: Joel Stanley <joel at jms.id.au>
Reviewed-by: Ryan Chen <ryan_chen at aspeedtech.com>
---
 drivers/i2c/ast_i2c.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/ast_i2c.c b/drivers/i2c/ast_i2c.c
index 2d3fecaa14ea..0a93d7c82911 100644
--- a/drivers/i2c/ast_i2c.c
+++ b/drivers/i2c/ast_i2c.c
@@ -16,6 +16,7 @@
 #include <asm/arch/scu_ast2500.h>
 #include <linux/delay.h>
 #include <linux/err.h>
+#include <reset.h>
 
 #include "ast_i2c.h"
 
@@ -108,19 +109,26 @@ static int ast_i2c_of_to_plat(struct udevice *dev)
 
 static int ast_i2c_probe(struct udevice *dev)
 {
-	struct ast2500_scu *scu;
+	struct reset_ctl reset_ctl;
+	int rc;
 
 	debug("Enabling I2C%u\n", dev_seq(dev));
 
 	/*
 	 * Get all I2C devices out of Reset.
-	 * Only needs to be done once, but doing it for every
-	 * device does not hurt.
+	 *
+	 * Only needs to be done once so test before performing reset.
 	 */
-	scu = ast_get_scu();
-	ast_scu_unlock(scu);
-	clrbits_le32(&scu->sysreset_ctrl1, SCU_SYSRESET_I2C);
-	ast_scu_lock(scu);
+	rc = reset_get_by_index(dev, 0, &reset_ctl);
+	if (rc) {
+		printf("%s: Failed to get reset signal\n", __func__);
+		return rc;
+	}
+
+	if (reset_status(&reset_ctl) > 0) {
+		reset_assert(&reset_ctl);
+		reset_deassert(&reset_ctl);
+	}
 
 	ast_i2c_init_bus(dev);
 
-- 
2.35.1