From d7d7c4312b71dd3879fa8640b23f6a5bac30e303 Mon Sep 17 00:00:00 2001 From: Anson Huang Date: Thu, 24 Mar 2016 17:41:08 +0800 Subject: MLK-12576 imx: imx6ul: disable POR_B internal pull up From TO1.1, SNVS adds internal pull up control for POR_B, the register filed is GPBIT[1:0], after system boot up, it can be set to 2b'01 to disable internal pull up. It can save about 30uA power in SNVS mode. Signed-off-by: Anson Huang --- arch/arm/cpu/armv7/mx6/soc.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index 4689924..c725fca 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -477,6 +477,15 @@ int arch_cpu_init(void) * drain 100K (0x0000b8a0). */ writel(0x0000b8a0, IOMUXC_BASE_ADDR + 0x29c); + } else { + /* + * From TO1.1, SNVS adds internal pull up control for POR_B, + * the register filed is GPBIT[1:0], after system boot up, + * it can be set to 2b'01 to disable internal pull up. + * It can save about 30uA power in SNVS mode. + */ + writel((readl(SNVS_LP_BASE_ADDR + 0x10) & (~0x1400)) | 0x400, + SNVS_LP_BASE_ADDR + 0x10); } #endif -- cgit v1.1