[U-Boot] [PATCH] 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: Peng Fan peng.fan@nxp.com Cc: Stefano Babic sbabic@denx.de --- arch/arm/cpu/armv7/mx6/soc.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-)
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index e23d3c6..e219a25 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -362,14 +362,27 @@ int arch_cpu_init(void) set_ahb_rate(132000000); }
- if (is_mx6ul() && is_soc_rev(CHIP_REV_1_0) == 0) { - /* - * According to the design team's requirement on i.MX6UL, - * the PMIC_STBY_REQ PAD should be configured as open - * drain 100K (0x0000b8a0). - * Only exists on TO1.0 - */ - writel(0x0000b8a0, IOMUXC_BASE_ADDR + 0x29c); + if (is_mx6ul()) { + if (is_soc_rev(CHIP_REV_1_0) == 0) { + /* + * According to the design team's requirement on + * i.MX6UL,the PMIC_STBY_REQ PAD should be configured + * as open drain 100K (0x0000b8a0). + * Only exists on TO1.0 + */ + 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(MX6UL_SNVS_LP_BASE_ADDR + 0x10) & + (~0x1400)) | 0x400, + MX6UL_SNVS_LP_BASE_ADDR + 0x10); + } }
if (is_mx6ull()) {
On 28/09/2016 03:40, Peng Fan wrote:
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: Peng Fan peng.fan@nxp.com Cc: Stefano Babic sbabic@denx.de
arch/arm/cpu/armv7/mx6/soc.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-)
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index e23d3c6..e219a25 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -362,14 +362,27 @@ int arch_cpu_init(void) set_ahb_rate(132000000); }
- if (is_mx6ul() && is_soc_rev(CHIP_REV_1_0) == 0) {
/** According to the design team's requirement on i.MX6UL,* the PMIC_STBY_REQ PAD should be configured as open* drain 100K (0x0000b8a0).* Only exists on TO1.0*/writel(0x0000b8a0, IOMUXC_BASE_ADDR + 0x29c);
if (is_mx6ul()) {
if (is_soc_rev(CHIP_REV_1_0) == 0) {/** According to the design team's requirement on* i.MX6UL,the PMIC_STBY_REQ PAD should be configured* as open drain 100K (0x0000b8a0).* Only exists on TO1.0*/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(MX6UL_SNVS_LP_BASE_ADDR + 0x10) &(~0x1400)) | 0x400,MX6UL_SNVS_LP_BASE_ADDR + 0x10);}}
if (is_mx6ull()) {
Applied to u-boot-imx, thanks !
Best regards, Stefano Babic
participants (2)
-
Peng Fan -
Stefano Babic