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authorGraeme Russ <gruss@tss-engineering.com>2015-01-25 12:07:52 +1100
committerStefano Babic <sbabic@denx.de>2015-02-10 12:48:50 +0100
commit7a086037071401ee781425c382846dddfe80df68 (patch)
treeaf1c3a2f0c7c3e631e6b49fdc5f19d387a496b30 /arch/arm/include
parent950eaf6230496585e72ebb965c458d35c6c7eac1 (diff)
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arm: mxs: Enable booting of mx28 without battery
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>
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