When occur i2c ack error, i2c controller generate two interrupts,
first is the ack error interrupt, then the complete interrupt.
i2c interrupt handler should keep the two interrupt value, and only
call complete() for the complete interrupt.
Signed-off-by: NLiguo Zhang <liguo.zhang@mediatek.com>
Signed-off-by: NEddie Huang <eddie.huang@mediatek.com>
Reviewed-by: NDaniel Kurtz <djkurtz@chromium.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Reset DMA in hardware init function to avoid unknown hardware state
before do any I2C operation.
Signed-off-by: NLiguo Zhang <liguo.zhang@mediatek.com>
Signed-off-by: NEddie Huang <eddie.huang@mediatek.com>
Reviewed-by: NDaniel Kurtz <djkurtz@chromium.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add mediatek MT8173 I2C controller driver. Compare to I2C controller
of earlier mediatek SoC, MT8173 fix write-then-read limitation, and
also increase message size to 64kb.
Signed-off-by: NXudong Chen <xudong.chen@mediatek.com>
Signed-off-by: NLiguo Zhang <liguo.zhang@mediatek.com>
Signed-off-by: NEddie Huang <eddie.huang@mediatek.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The mediatek SoCs have I2C controller that handle I2C transfer.
This patch include common I2C bus driver.
This driver is compatible with I2C controller on mt65xx/mt81xx.
Signed-off-by: NXudong Chen <xudong.chen@mediatek.com>
Signed-off-by: NLiguo Zhang <liguo.zhang@mediatek.com>
Signed-off-by: NEddie Huang <eddie.huang@mediatek.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>