Because some old designware IPs were not supporting setting an SDA hold
time, vendors developed their own solution. Add a way for the final driver
to provide its own SDA hold time handling.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-common.c | 6 ++++++
drivers/i2c/busses/i2c-designware-core.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index 9afc3e075b33..545b69d6be3c 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -297,6 +297,12 @@ void i2c_dw_set_sda_hold_time(struct dw_i2c_dev *dev)
{
u32 reg;
+ if (dev->set_sda_hold_time) {
+ dev->set_sda_hold_time(dev);
+
+ return;
+ }
+
/* Configure SDA Hold Time if required. */
reg = dw_readl(dev, DW_IC_COMP_VERSION);
if (reg >= DW_IC_SDA_HOLD_MIN_VERS) {
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index bc43fb9ac1cf..b2778b6d8aca 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -283,6 +283,7 @@ struct dw_i2c_dev {
void (*disable)(struct dw_i2c_dev *dev);
void (*disable_int)(struct dw_i2c_dev *dev);
int (*init)(struct dw_i2c_dev *dev);
+ int (*set_sda_hold_time)(struct dw_i2c_dev *dev);
int mode;
struct i2c_bus_recovery_info rinfo;
};
--
2.18.0
