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dm: cros_ec: Convert the I2C tunnel code to use driver model

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The Chrome OS EC supports tunnelling through to an I2C bus on the EC. This
currently uses a copy of the I2C command code and a special 'crosec'
sub-command.

With driver model we can define an I2C bus which tunnels through to the EC,
and use the normal 'i2c' command to access it. This simplifies the code and
removes some duplication.

Add an I2C driver which tunnels through to the EC. Adjust the EC code to
support binding child devices so that it can be set up. Adjust the existing
I2C xfer function to fit driver model better.

For now the old code remains to allow things to still work. It will be
removed in a later patch once the new flow is fully enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-08-03 08:19:23 -06:00
parent a0942a6d3e
commit cc456bd7df
8 changed files with 161 additions and 11 deletions
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14
include/cros_ec.h
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@@ -390,6 +390,16 @@ int cros_ec_decode_ec_flash(const void *blob, int node,
*/
void cros_ec_check_keyboard(struct cros_ec_dev *dev);
struct i2c_msg;
/*
* Tunnel an I2C transfer to the EC
*
* @param dev CROS-EC device
* @param msg List of messages to transfer
* @param nmsgs Number of messages to transfer
*/
int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
/*
* Tunnel an I2C transfer to the EC
*
@@ -401,7 +411,7 @@ void cros_ec_check_keyboard(struct cros_ec_dev *dev);
* @param len Length of buffer
* @param is_read 1 if this is a read, 0 if this is a write
*/
int cros_ec_i2c_xfer(struct cros_ec_dev *dev, uchar chip, uint addr,
int alen, uchar *buffer, int len, int is_read);
int cros_ec_i2c_xfer_old(struct cros_ec_dev *dev, uchar chip, uint addr,
int alen, uchar *buffer, int len, int is_read);
#endif