From e5f87471392b344b1261d1eaf93fd44710587ea9 Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Thu, 30 Sep 2021 18:42:17 +0300 Subject: [PATCH 229/247] ARM: dts: at91: sama7g5ek: add suspend voltage for ddr3l rail SAMA7G5-EK board has DDR3L type of memory soldered. This needs 1.35V. The 1.35V for DDR3L rail at run-time is selected by the proper configuration on SELV2 pin (for 1.35V it needs to be in high-z state). When suspended the MCP16502 PMIC soldered on SAMA7G5-EK will use different sets of configuration registers to provide proper voltages on its rail. Run-time configuration registers could be configured differently than suspend configuration register for MCP16502 (VSEL2 affects only run-time configuration). In suspend states the DDR3L memory soldered on SAMA7G5-EK switches to self-refresh. Even on self-refresh it needs to be powered by a 1.35V rail. Thus, make sure the PMIC is configured properly when system is suspended. Fixes: 7540629e2fc7 (ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek") Signed-off-by: Claudiu Beznea Signed-off-by: Nicolas Ferre Link: https://lore.kernel.org/r/20210930154219.2214051-2-claudiu.beznea@microchip.com --- arch/arm/boot/dts/at91-sama7g5ek.dts | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/arm/boot/dts/at91-sama7g5ek.dts +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts @@ -196,11 +196,13 @@ regulator-state-standby { regulator-on-in-suspend; + regulator-suspend-microvolt = <1350000>; regulator-mode = <4>; }; regulator-state-mem { regulator-on-in-suspend; + regulator-suspend-microvolt = <1350000>; regulator-mode = <4>; }; };