diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/i2c/Makefile | 1 | ||||
| -rw-r--r-- | drivers/i2c/cros_ec_tunnel.c | 41 |
3 files changed, 53 insertions, 0 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index caee3d8338..e861b53686 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -19,6 +19,17 @@ config DM_I2C_COMPAT to convert all code for a board in a single commit. It should not be enabled for any board in an official release. +config I2C_CROS_EC_TUNNEL + tristate "Chrome OS EC tunnel I2C bus" + depends on CROS_EC + help + This provides an I2C bus that will tunnel i2c commands through to + the other side of the Chrome OS EC to the I2C bus connected there. + This will work whatever the interface used to talk to the EC (SPI, + I2C or LPC). Some Chromebooks use this when the hardware design + does not allow direct access to the main PMIC from the AP. + + config DM_I2C_GPIO bool "Enable Driver Model for software emulated I2C bus driver" depends on DM_I2C && DM_GPIO diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index dc9e81bf76..7f01fce2e7 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_DM_I2C) += i2c-uclass.o obj-$(CONFIG_DM_I2C_COMPAT) += i2c-uclass-compat.o obj-$(CONFIG_DM_I2C_GPIO) += i2c-gpio.o +obj-$(CONFIG_I2C_CROS_EC_TUNNEL) += cros_ec_tunnel.o obj-$(CONFIG_SYS_I2C_ADI) += adi_i2c.o obj-$(CONFIG_I2C_MV) += mv_i2c.o diff --git a/drivers/i2c/cros_ec_tunnel.c b/drivers/i2c/cros_ec_tunnel.c new file mode 100644 index 0000000000..7ab1fd898a --- /dev/null +++ b/drivers/i2c/cros_ec_tunnel.c @@ -0,0 +1,41 @@ +/* + * 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 <cros_ec.h> +#include <errno.h> +#include <i2c.h> + +static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed) +{ + return 0; +} + +static int cros_ec_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, + int nmsgs) +{ + return cros_ec_i2c_tunnel(dev->parent, msg, nmsgs); +} + +static const struct dm_i2c_ops cros_ec_i2c_ops = { + .xfer = cros_ec_i2c_xfer, + .set_bus_speed = cros_ec_i2c_set_bus_speed, +}; + +static const struct udevice_id cros_ec_i2c_ids[] = { + { .compatible = "google,cros-ec-i2c-tunnel" }, + { } +}; + +U_BOOT_DRIVER(cros_ec_tunnel) = { + .name = "cros_ec_tunnel", + .id = UCLASS_I2C, + .of_match = cros_ec_i2c_ids, + .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), + .ops = &cros_ec_i2c_ops, +}; |