target/linux/at91/patches-5.10/229-ARM-dts-at91-sama7g5ek-add-suspend-voltage-for-ddr3l.patch

   1 From e5f87471392b344b1261d1eaf93fd44710587ea9 Mon Sep 17 00:00:00 2001
   2 From: Claudiu Beznea <claudiu.beznea@microchip.com>
   3 Date: Thu, 30 Sep 2021 18:42:17 +0300
   4 Subject: [PATCH 229/247] ARM: dts: at91: sama7g5ek: add suspend voltage for
   5  ddr3l rail
   6
   7 SAMA7G5-EK board has DDR3L type of memory soldered. This needs 1.35V. The
   8 1.35V for DDR3L rail at run-time is selected by the proper configuration
   9 on SELV2 pin (for 1.35V it needs to be in high-z state). When suspended
  10 the MCP16502 PMIC soldered on SAMA7G5-EK will use different sets of
  11 configuration registers to provide proper voltages on its rail. Run-time
  12 configuration registers could be configured differently than suspend
  13 configuration register for MCP16502 (VSEL2 affects only run-time
  14 configuration). In suspend states the DDR3L memory soldered on SAMA7G5-EK
  15 switches to self-refresh. Even on self-refresh it needs to be powered by
  16 a 1.35V rail. Thus, make sure the PMIC is configured properly when system
  17 is suspended.
  18
  19 Fixes: 7540629e2fc7 (ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek")
  20 Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
  21 Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
  22 Link: https://lore.kernel.org/r/20210930154219.2214051-2-claudiu.beznea@microchip.com
  23 ---
  24  arch/arm/boot/dts/at91-sama7g5ek.dts | 2 ++
  25  1 file changed, 2 insertions(+)
  26
  27 --- a/arch/arm/boot/dts/at91-sama7g5ek.dts
  28 +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
  29 @@ -196,11 +196,13 @@
  30
  31                                         regulator-state-standby {
  32                                                 regulator-on-in-suspend;
  33 +                                               regulator-suspend-microvolt = <1350000>;
  34                                                 regulator-mode = <4>;
  35                                         };
  36
  37                                         regulator-state-mem {
  38                                                 regulator-on-in-suspend;
  39 +                                               regulator-suspend-microvolt = <1350000>;
  40                                                 regulator-mode = <4>;
  41                                         };
  42                                 };