[PATCH] mxs: power: Change sequence of enabling DCDC switches

Lukasz Majewski lukma at denx.de
Wed Oct 13 15:40:12 CEST 2021


The imx28 uses following voltage supplies hierarchy:

VDD_5V (VDD_BAT) -> VDDIO -> VDDA -> VDDMEM
			     \-----> VDDD

One shall first enable DCDC on the parent source (VDDIO) and then
follow with its children.

Signed-off-by: Lukasz Majewski <lukma at denx.de>
---
 arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 4 ++--
 1 file changed, 2 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 35ea71a5ba8..c33170f06d3 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
@@ -627,11 +627,11 @@ static void mxs_power_enable_4p2(void)
 
 	mxs_power_init_dcdc_4p2_source();
 
-	writel(vdddctrl, &power_regs->hw_power_vdddctrl);
+	writel(vddioctrl, &power_regs->hw_power_vddioctrl);
 	early_delay(20);
 	writel(vddactrl, &power_regs->hw_power_vddactrl);
 	early_delay(20);
-	writel(vddioctrl, &power_regs->hw_power_vddioctrl);
+	writel(vdddctrl, &power_regs->hw_power_vdddctrl);
 
 	/*
 	 * Check if FET is enabled on either powerout and if so,
-- 
2.20.1



More information about the U-Boot mailing list