[U-Boot] [v2 PATCH 2/3] arm: mxs: Enable booting of mx28 without battery

[Graeme Russ]

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 implements the changes to the Freescale bootlets
which allow this configuration to properly boot the mx28 processor

Signed-off-by: Graeme Russ <gruss at tss-engineering.com>
Signed-off-by: Damien Gotfroi <dgotfroi at greenwatch.be>
---

Changes in v2
 - Implemented Damien Gotfroi's simplified version

---
 arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
index 7fb734e..0634c81 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
@@ -14,6 +14,12 @@
 
 #include "mxs_init.h"
 
+#ifdef CONFIG_SYS_MXS_VDD5V_ONLY
+#define DCDC4P2_DROPOUT_CONFIG	POWER_DCDC4P2_DROPOUT_CTRL_100MV
+#else
+#define DCDC4P2_DROPOUT_CONFIG	POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
+				POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL
+#endif
 /**
  * mxs_power_clock2xtal() - Switch CPU core clock source to 24MHz XTAL
  *
@@ -303,8 +309,7 @@ static void mxs_power_init_4p2_params(void)
 
 	clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
 		POWER_DCDC4P2_DROPOUT_CTRL_MASK,
-		POWER_DCDC4P2_DROPOUT_CTRL_100MV |
-		POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL);
+		DCDC4P2_DROPOUT_CONFIG);
 
 	clrsetbits_le32(&power_regs->hw_power_5vctrl,
 		POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
-- 
1.9.3