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i2c: designware: allow IP specific sda_hold_time

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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.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Alexandre Belloni 2018-08-31 17:11:10 +02:00 • committed by Wolfram Sang
parent 96742775a3
commit c7fa7aeff8
2 changed files with 3 additions and 0 deletions
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2
drivers/i2c/busses/i2c-designware-common.c
View file

@ -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_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 & ~(u32)DW_IC_SDA_HOLD_RX_MASK,
dev->sda_hold_time >> DW_IC_SDA_HOLD_RX_SHIFT); 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) { } else if (dev->sda_hold_time) {
dev_warn(dev->dev, dev_warn(dev->dev,
"Hardware too old to adjust SDA hold time.\n"); "Hardware too old to adjust SDA hold time.\n");

1
drivers/i2c/busses/i2c-designware-core.h
View file

@ -269,6 +269,7 @@ struct dw_i2c_dev {
void (*disable)(struct dw_i2c_dev *dev); void (*disable)(struct dw_i2c_dev *dev);
void (*disable_int)(struct dw_i2c_dev *dev); void (*disable_int)(struct dw_i2c_dev *dev);
int (*init)(struct dw_i2c_dev *dev); int (*init)(struct dw_i2c_dev *dev);
int (*set_sda_hold_time)(struct dw_i2c_dev *dev);
int mode; int mode;
struct i2c_bus_recovery_info rinfo; struct i2c_bus_recovery_info rinfo;
}; };