[U-Boot] [U-Boot, 04/10] ARM: DRA7: Add support for IO delay configuration

[Tom Rini]

On Thu, Jun 04, 2015 at 04:42:36PM +0530, Lokesh Vutla wrote:

> On DRA7, in addition to the regular muxing of pins, an additional
> hardware module called IODelay which is also expected to be
> configured. This "IODelay" module has it's own register space that is
> independent of the control module.
> 
> It is advocated strongly in TI's official documentation considering
> the existing design of the DRA7 family of processors during mux or
> IODelay recalibration, there is a potential for a significant glitch
> which may cause functional impairment to certain hardware. It is
> hence recommended to do muxing as part of IOdelay recalibration.
> 
> IODELAY recalibration sequence:
> - Complete AVS voltage change on VDD_CORE_L
> - Unlock IODLAY config registers.
> - Perform IO delay calibration with predefined values.
> - Isolate all the IOs
> - Update the delay mechanism for each IO with new calibrated values.
> - Configure PAD configuration registers
> - De-isolate all the IOs.
> - Relock IODELAY config registers.
> 
> Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
> Signed-off-by: Nishanth Menon <nm at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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