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i2c: recovery: add get_bus_free callback

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Some IP cores have an internal 'bus free' logic which may be more
advanced than just checking if SDA is high. Add a separate callback to
get this status. Filling it is optional.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang
2018-07-11 00:24:22 +02:00
committed by Wolfram Sang
parent 0b71026c69
commit 7ca5f6be79
2 changed files with 26 additions and 4 deletions
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3
include/linux/i2c.h
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@@ -587,6 +587,8 @@ struct i2c_timings {
* @set_sda: This sets/clears the SDA line. This or get_sda() is mandatory for
* generic SCL recovery. Populated internally, if sda_gpio is a valid GPIO,
* for generic GPIO recovery.
* @get_bus_free: Returns the bus free state as seen from the IP core in case it
* has a more complex internal logic than just reading SDA. Optional.
* @prepare_recovery: This will be called before starting recovery. Platform may
* configure padmux here for SDA/SCL line or something else they want.
* @unprepare_recovery: This will be called after completing recovery. Platform
@@ -601,6 +603,7 @@ struct i2c_bus_recovery_info {
void (*set_scl)(struct i2c_adapter *adap, int val);
int (*get_sda)(struct i2c_adapter *adap);
void (*set_sda)(struct i2c_adapter *adap, int val);
int (*get_bus_free)(struct i2c_adapter *adap);
void (*prepare_recovery)(struct i2c_adapter *adap);
void (*unprepare_recovery)(struct i2c_adapter *adap);