Commit c7fa7aef authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Wolfram Sang
Browse files

i2c: designware: allow IP specific sda_hold_time 



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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 96742775

drivers/i2c/busses/i2c-designware-common.c

+2 −0
Original line number Diff line number Diff line
@@ -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");

drivers/i2c/busses/i2c-designware-core.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

};

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