tree 9bda8bf4afa2352b030ac6e0296511c14ffba53a
parent 34fb8bda4700734ea886e94510916bf0633e0aa6
author Lei YU <mine260309@gmail.com> 1575007202 +0800
committer Lei YU <mine260309@gmail.com> 1575872081 +0800

i2c: Add i2c block transaction support

The previous code always uses SMBus block read/write.
On some PSU (e.g. FP5280G2's PSU) the I2C block read/write is
required, so add that support.

Specifically, add a Mode enum class and add the parameter for block
read/write to indicate whether SMBus or I2C block read/write is to be
called.

Tested: Verify the code works on FP5280G2 with I2C block write.

Note: Currently there is no case for I2C block read, so that function is
      not tested.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I5f77ffe6900d14f3703dae7241799a7b37c5a726