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f02a5e9045
Add 1.8V IO support for some GPIOs and I2C pins. We use a array (gpio_lvol_table) to confine which IO pins can switch to 1.8V. Before setting it to support low voltage level, FW should set IO pin's type to open-drain and disable internal pulling up or down. We also add examples in gpio.inc of npcx_evb and npcx_evb_arm to indicate how to set GPIO & I2C pins to 1.8V if user adds CONFIG_TEST_1P8V definition in board.h. In i2c.c driver, this version removes the internal pull-up feature of i2c ports since the driving force is too weak. (about 30K ohm) Modified sources: 1. gpio.c: Add 1.8V IO support for some GPIOs and I2C pins. 2. i2c.c: Remove internal pull-ups feature for i2c pins and move 1.8V support to gpio.c. 3. register.h: Modified NPCX_LV_GPIO_CTL register & bits definitions. 4. npcx_evb\gpio.inc: Add examples of 1.8V IO. 5. npcx_evb_arm\gpio.inc: Add examples of 1.8V IO. BUG=chrome-os-partner:34346 TEST=make buildall -j; test nuvoton IC specific drivers BRANCH=none Change-Id: I73a840ae321820212e50d609dab17576117a7d64 Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/330037 Reviewed-by: Shawn N <shawnn@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly