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More and more I2C client drivers use debugfs entries and currently they need to manage a subdir for their files on their own. This means inconsistent naming for these subdirs and they are scattered all over the debugfs-tree as well. Not to mention the duplicated code. Let the I2C core provide and maintain a proper directory per client. Note: It was considered to save the additional pointer in 'struct i2c_client' and only provide a subdir when requested via a helper function. When sketching this approach, more and more corner cases appeared, though, so the current solution with its simple and unabiguous code was chosen. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net>