[U-Boot] [v3 PATCH 2/3] arm: mxs: Enable booting of mx28 without battery

[Stefano Babic <sbabic@denx.de>]

On 25/01/2015 02:07, Graeme Russ wrote:
> Section 4.1.2 of Freescale Application Note AN4199 describes the
> configuration required to operate the mx28 from a 5V source without a
> battery.
> 
> This patch changes the behaviour of the dropout control of the DC-DC
> converter (refer to section 11.12.9 of the mx28 Application Processor
> Reference Manual - Document Number: MCIMX28RM, Rev 2, 08/2013) to the
> following:
>  - Always use 4P2 Linear Regulator if CONFIG_SYS_MXS_VDD5V_ONLY is defined
>  - Switch between 4P2 Linear Regulator and Battery, using whichever has
>    the highest voltage if CONFIG_SYS_MXS_VDD5V_ONLY isnot set (this is
>    the same as the pre-patch behaviour)
> 
> Signed-off-by: Graeme Russ <gruss@tss-engineering.com>
> Signed-off-by: Damien Gotfroi <dgotfroi@greenwatch.be>
> ---
> 
> Changes in v2
>  - Implemented Damien Gotfroi's simplified version
> 
> Changes in v3
>  - Updated commit message
>  - Explicitly use POWER_DCDC4P2_DROPOUT_CTRL_SRC_4P2 for the
>    DCDC4P2_DROPOUT_CONFIG define (it is 0x0 so it make no functional
>    difference)
> 
> ---

Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic


-- 
=====================================================================
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================