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i2c: designware: add reset ctrl to driver 

Add code to look for a reset manager property. Specifically, look for the
reset-names of 'i2c'. A reset property is an optional feature, so only print
out a warning and do not fail if a reset property is not present.

If a reset property is discovered, then use it to deassert, thus bringing the
IP out of reset.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
This commit is contained in:
Dinh Nguyen 2018-04-04 17:18:24 -05:00 committed by Marek Vasut
parent 449ff9c431
commit 622597dee4
1 changed files with 10 additions and 0 deletions
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10
drivers/i2c/designware_i2c.c
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@ -9,6 +9,7 @@
#include <dm.h>
#include <i2c.h>
#include <pci.h>
#include <reset.h>
#include <asm/io.h>
#include "designware_i2c.h"
@ -34,6 +35,7 @@ static struct dw_scl_sda_cfg byt_config = {
struct dw_i2c {
struct i2c_regs *regs;
struct dw_scl_sda_cfg *scl_sda_cfg;
struct reset_ctl reset_ctl;
};
#ifdef CONFIG_SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED
@ -534,6 +536,7 @@ static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr,
static int designware_i2c_probe(struct udevice *bus)
{
struct dw_i2c *priv = dev_get_priv(bus);
int ret;
if (device_is_on_pci_bus(bus)) {
#ifdef CONFIG_DM_PCI
@ -549,6 +552,13 @@ static int designware_i2c_probe(struct udevice *bus)
priv->regs = (struct i2c_regs *)devfdt_get_addr_ptr(bus);
}
ret = reset_get_by_name(bus, "i2c", &priv->reset_ctl);
if (ret)
pr_info("reset_get_by_name() failed: %d\n", ret);
if (&priv->reset_ctl)
reset_deassert(&priv->reset_ctl);
__dw_i2c_init(priv->regs, 0, 0);
return 0;