openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: dts: am437x-gp-evm: Add state for ddr3 vtt toggle pin 

Add pinctrl data for ddr_vtt_toggle pin so that it is configured
for proper state during DeepSleep0. The pin should enter DS0 off mode
and hold the line low so VTT regulator is kept off while suspended.
It is also important for the PULLUP to be set on this pin so that
on removal of isolation, the VTT line is pulled high as a requirement
for bringing the DDR3 out of self-refresh.

This toggling is dependent on the IO isolation controlled by the
wkup_m3. Without placing the IOs into isolation the DS0 states set for
the pin will not be latched into effect during suspend.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Dave Gerlach 2018-11-07 10:34:15 +05:30 committed by Tony Lindgren
parent a18695933b
commit 865852a6e5
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm/boot/dts/am437x-gp-evm.dts
View File

@ -162,9 +162,15 @@ beeper: beeper {
&am43xx_pinmux {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&wlan_pins_default>;
pinctrl-0 = <&wlan_pins_default &ddr3_vtt_toggle_default>;
pinctrl-1 = <&wlan_pins_sleep>;
ddr3_vtt_toggle_default: ddr_vtt_toggle_default {
pinctrl-single,pins = <
0x25C (DS0_PULL_UP_DOWN_EN | PIN_OUTPUT_PULLUP | DS0_FORCE_OFF_MODE | MUX_MODE7) /* spi0_cs0.gpio5_7 */
>;
};
i2c0_pins: i2c0_pins {
pinctrl-single,pins = <
AM4372_IOPAD(0x988, PIN_INPUT_PULLUP | SLEWCTRL_FAST | MUX_MODE0) /* i2c0_sda.i2c0_sda */