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i2c/aspeed: Fix reset control

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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@jms.id.au>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
This commit is contained in:
Joel Stanley 2022-06-23 14:40:38 +09:30 committed by Tom Rini
parent 0a8bd97f88
commit 453fe1eece
1 changed files with 15 additions and 7 deletions
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22
drivers/i2c/ast_i2c.c
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@ -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);