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cros_ec: Support the LDO access method used by spring

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Add a driver to support the special LDO access used by spring. This is a
custom method in the cros_ec protocol - it does not use an I2C
pass-through.

There are two implementation choices:

1. Write a special LDO driver which can talk across the EC. Duplicate all
the logic from TPS65090 for retrying when the LDO fails to come up.

2. Write a special I2C bus driver which pretends to be a TPS65090 and
transfers reads and writes using the LDO message.

Either is distasteful. The latter method is chosen since it results in less
code duplication and a fairly simple (30-line) implementation of the core
logic.

The crosec 'ldo' subcommand could be removed (since i2c md/mw will work
instead) but is retained as a convenience.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-08-03 08:19:24 -06:00
parent cc456bd7df
commit f48eaf01b2
5 changed files with 104 additions and 12 deletions
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4
include/cros_ec.h
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@@ -350,7 +350,7 @@ int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
* @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
* @return 0 if ok, -1 on error
*/
int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
/**
* Read back a LDO / FET current state.
@@ -360,7 +360,7 @@ int cros_ec_set_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t state);
* @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
* @return 0 if ok, -1 on error
*/
int cros_ec_get_ldo(struct cros_ec_dev *dev, uint8_t index, uint8_t *state);
int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
/**
* Get access to the error reported when cros_ec_board_init() was called