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Subject[PATCH v3 3/6] i2c: designware: allow IP specific sda_hold_time
Date
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@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/i2c/busses/i2c-designware-common.c | 2 ++
drivers/i2c/busses/i2c-designware-core.h | 1 +
2 files changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index e67d6c7d552c..463906a02c7f 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -201,6 +201,8 @@ int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)
dev_dbg(dev->dev, "SDA Hold Time TX:RX = %d:%d\n",
dev->sda_hold_time & ~(u32)DW_IC_SDA_HOLD_RX_MASK,
dev->sda_hold_time >> DW_IC_SDA_HOLD_RX_SHIFT);
+ } else if (dev->set_sda_hold_time) {
+ dev->set_sda_hold_time(dev);
} else if (dev->sda_hold_time) {
dev_warn(dev->dev,
"Hardware too old to adjust SDA hold time.\n");
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 70c188d6fb6b..870444bbbcc4 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -269,6 +269,7 @@ 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
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