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| author | David Box <david.e.box@linux.intel.com> | 2015-01-15 12:12:16 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-01-26 14:26:16 +0300 |
| commit | c0601d285efe063def984f91b04de2d227f89526 (patch) | |
| tree | f405abc5b7a41d51893e3e59821781075b1571e6 /drivers/i2c/busses/i2c-designware-core.h | |
| parent | 72f0271576eeef40c81c2949e0a8abeaef9a7690 (diff) | |
| download | linux-c0601d285efe063def984f91b04de2d227f89526.tar.xz | |
i2c: designware: Add i2c bus locking support
Adds support for acquiring and releasing a hardware bus lock in the i2c
designware core transfer function. This is needed for i2c bus controllers
that are shared with but not controlled by the kernel.
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-core.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-core.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 5a410ef17abd..ef8ba839e2d3 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -61,6 +61,9 @@ * @ss_lcnt: standard speed LCNT value * @fs_hcnt: fast speed HCNT value * @fs_lcnt: fast speed LCNT value + * @acquire_lock: function to acquire a hardware lock on the bus + * @release_lock: function to release a hardware lock on the bus + * @pm_runtime_disabled: true if pm runtime is disabled * * HCNT and LCNT parameters can be used if the platform knows more accurate * values than the one computed based only on the input clock frequency. @@ -101,6 +104,9 @@ struct dw_i2c_dev { u16 ss_lcnt; u16 fs_hcnt; u16 fs_lcnt; + int (*acquire_lock)(struct dw_i2c_dev *dev); + void (*release_lock)(struct dw_i2c_dev *dev); + bool pm_runtime_disabled; }; #define ACCESS_SWAP 0x00000001 |