This is used on most Intel platforms. We don't have a driver for it yet, but add a stub to handle the init. For now this targets ivybridge so we may want to add a device tree binding and generalise it when other platforms are supported.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Heiko Schocher hs@denx.de Reviewed-by: Bin Meng bmeng.cn@gmail.com ---
Changes in v2: - Expand the Kconfig help a little
drivers/i2c/Kconfig | 9 +++++++++ drivers/i2c/Makefile | 1 + drivers/i2c/intel_i2c.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) create mode 100644 drivers/i2c/intel_i2c.c
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 14adda2..46b83e7 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -58,6 +58,15 @@ config DM_I2C_GPIO bindings are supported. Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
+config SYS_I2C_INTEL + bool "Intel I2C/SMBUS driver" + depends on DM_I2C + help + Add support for the Intel SMBUS driver. So far this driver is just + a stub which perhaps some basic init. There is no implementation of + the I2C API meaning that any I2C operations will immediately fail + for now. + config SYS_I2C_ROCKCHIP bool "Rockchip I2C driver" depends on DM_I2C diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 811ad9b..a2a956a 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_SYS_I2C_DW) += designware_i2c.o obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o obj-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o obj-$(CONFIG_SYS_I2C_IHS) += ihs_i2c.o +obj-$(CONFIG_SYS_I2C_INTEL) += intel_i2c.o obj-$(CONFIG_SYS_I2C_KONA) += kona_i2c.o obj-$(CONFIG_SYS_I2C_LPC32XX) += lpc32xx_i2c.o obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o diff --git a/drivers/i2c/intel_i2c.c b/drivers/i2c/intel_i2c.c new file mode 100644 index 0000000..1082d1a --- /dev/null +++ b/drivers/i2c/intel_i2c.c @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2015 Google, Inc + * Written by Simon Glass sjg@chromium.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <i2c.h> +#include <asm/io.h> + +int intel_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +{ + return -ENOSYS; +} + +int intel_i2c_probe_chip(struct udevice *bus, uint chip_addr, uint chip_flags) +{ + return -ENOSYS; +} + +int intel_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +{ + return 0; +} + +static int intel_i2c_probe(struct udevice *dev) +{ + return 0; +} + +static const struct dm_i2c_ops intel_i2c_ops = { + .xfer = intel_i2c_xfer, + .probe_chip = intel_i2c_probe_chip, + .set_bus_speed = intel_i2c_set_bus_speed, +}; + +static const struct udevice_id intel_i2c_ids[] = { + { .compatible = "intel,ich-i2c" }, + { } +}; + +U_BOOT_DRIVER(intel_i2c) = { + .name = "i2c_intel", + .id = UCLASS_I2C, + .of_match = intel_i2c_ids, + .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), + .ops = &intel_i2c_ops, + .probe = intel_i2c_probe, +};