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i2c: Provide a stub for i2c_detect_slave_mode()

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Drivers would like to call i2c_detect_slave_mode() even if !I2C_SLAVE.
Give them what they want to,

Otherwise kernel will not compile:
drivers/i2c/busses/i2c-designware-platdrv.c: In function ‘dw_i2c_plat_probe’:
drivers/i2c/busses/i2c-designware-platdrv.c:331:6: error: implicit declaration of function ‘i2c_detect_slave_mode’ [-Werror=implicit-function-declaration]
  if (i2c_detect_slave_mode(&pdev->dev))
      ^~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

Fixes: 6e38cf3b44 ("i2c: designware: Let slave adapter support be optional")
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Andy Shevchenko 2017-07-06 20:26:17 +03:00 committed by Wolfram Sang
parent 6e38cf3b44
commit 8f1a357d41
1 changed files with 2 additions and 0 deletions
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include/linux/i2c.h
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@ -295,6 +295,8 @@ static inline int i2c_slave_event(struct i2c_client *client,
{
return client->slave_cb(client, event, val);
}
#else
static inline bool i2c_detect_slave_mode(struct device *dev) { return false; }
#endif
/**