This series is for Mediatek SoCs I2C controller common bus driver. Earlier MTK SoC (for example, MT6589, MT8135) I2C HW has some limitations. New generation SoC like MT8173 fix following limitations: 1. Only support one i2c_msg number. One exception is WRRD (write then read) mode. WRRD can have two i2c_msg numbers. 2. Mediatek I2C controller support WRRD(write then read) mode, in WRRD mode the Repeat Start will be issued between 2 messages. In this driver if 2 messages is first write then read, the driver will combine 2 messages using Write-Read mode so the RS will be issued between the 2 messages. 3. The max transfer data length is 255 in one message. In WRRD mode, the max data length of second msg is 31. MT8135 and MT6589 can control I2C pins on PMIC(MT6397) by setting the i2c registers in MT8135 side. In this case, driver should set OFFSET_PATH_DIR bit first, the operation on other registers are still the same. For now MT6589/MT8135 support this, MT6577/MT6595/MT8127 do not support. For example, If want to use I2C4/5/6 pins on MT8135 just need to enable the pinmux, else if want to use I2C pins on PMIC(MT6397) need to add "mediatek,have-pmic" property in the .dts file of each platform. This driver is based on 4.1-rc1. Change in v8: Fix Wolfram's review comments like sort include file order, remove thin wrapper functions, remove define number that only use once, and revise error return value. Change in v7: Fix mtk_i2c_of_match in wrong patch bug. Change in v6: 1. Update binding document not use default clock-frequency as example. 2. Add mtk_i2c_compatible struct and pass hardware capabilities through of_device_id 3. Remove some hardware setting in mtk_i2c_do_transfer to mtk_i2c_init_hw so just init one time. 4. Correct mtk_i2c_parse_dt don't set default clock bug. Change in v5: Apply new i2c_adapter_quirks patch [2]. Change to use dam_map_single to map dma buffer. Add spinlock to fix race condition. Check of_property_read_u32 return value. Remove I2C_FUNC_10BIT_ADDR capability due to driver not implement. Add MT8173 I2C driver. Change in v4: Modify to support i2c_adapter_quirks base on Wolfram's patch [1]. Remove check transfer size and WRRD combine code. Instead, fill quirk property and let i2c_check_for_quirks to do the filter. [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/314804.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/325744.html Eddie Huang (1): I2C: mediatek: Add driver for MediaTek MT8173 I2C controller Xudong Chen (2): dt-bindings: Add I2C bindings for mt65xx/mt81xx. I2C: mediatek: Add driver for MediaTek I2C controller .../devicetree/bindings/i2c/i2c-mt6577.txt | 41 ++ drivers/i2c/busses/Kconfig | 9 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-mt65xx.c | 715 +++++++++++++++++++++ 4 files changed, 766 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mt6577.txt create mode 100644 drivers/i2c/busses/i2c-mt65xx.c -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
