[RFC 1/2] ARM: OMAP2+: AM33XX: I2C Sleep/wake sequence support

[Tony Lindgren]

* Russ Dill <Russ.Dill at ti.com> [130501 12:07]:
> This patch adds the ability to write an I2C sleep sequence from
> SRAM just before WFI, and a wake sequence just after control is passed
> from the M3. This is useful for adjusting voltages during sleep that cannot
> be lowered while SDRAM is active.
> 
> Each sequence is a series of I2C transfers in the form:
> 
> u8 length | u8 chip address | u8 byte0/reg address | u8 byte 1 | u8 byte n ...
> 
> The length indicates the number of bytes to transfer, including the register
> address. The length of the sequence is limited by the amount of space
> reserved in SRAM, 127 bytes.
> 
> The sequences are taken from the i2c1 node in the device tree. The property
> name for the sleep sequence is "sleep_sequence" and the property name for
> the wake sequence is "wake_sequence". Each property should be an array of
> bytes.
> 
> No actions are performed if the properties are not present in the device
> tree.

Looks like you should make that into just a regular device driver that lives
under drivers/ somewhere?

Regards,

Tony