On Tue, 28 Apr 2015, Eddie Huang wrote: > This series is for Mediatek SoCs I2C controller common bus driver. > > Earlier MTK SoC ((for example, MT6589, MT8135)) I2C HW has some limitationes. > 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 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 | 748 +++++++++++++++++++++ > 4 files changed, 799 insertions(+) > create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mt6577.txt > create mode 100644 drivers/i2c/busses/i2c-mt65xx.c Why have you sent me this? -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
