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authorDinh Nguyen2018-04-04 17:18:24 -0500
committerMarek Vasut2018-04-17 11:39:49 +0200
commit622597dee4f66d5bd7dd5135d770077af04b0349 (patch)
treea609029d98c0175b49a35f3aeb739d6330381424
parent449ff9c4315563791282a7dd62303e20a48a007e (diff)
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>
-rw-r--r--drivers/i2c/designware_i2c.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index 8cfed2194c5..419d021a314 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -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;