at91: add kernel support for sama7g5 soc

Add kernel support for SAMA7G5 by back-porting mainline kernel patches.
Among SAMA7G5 features could be remembered:
- ARM Cortex-A7
- double data rate multi-port dynamic RAM controller supporting DDR2,
  DDR3, DDR3L, LPDDR2, LPDDR3 up to 533MHz
- peripherals for audio, video processing
- 1 gigabit + 1 megabit Ethernet controllers
- 6 CAN controllers
- trust zone support
- DVFS for CPU
- criptography IPs

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/target/linux/at91/patches-5.10/229-ARM-dts-at91-sama7g5ek-add-suspend-voltage-for-ddr3l.patch b/target/linux/at91/patches-5.10/229-ARM-dts-at91-sama7g5ek-add-suspend-voltage-for-ddr3l.patch
new file mode 100644
index 0000000000..ce412dde1c
--- /dev/null
+++ b/target/linux/at91/patches-5.10/229-ARM-dts-at91-sama7g5ek-add-suspend-voltage-for-ddr3l.patch
@@ -0,0 +1,47 @@
+From e5f87471392b344b1261d1eaf93fd44710587ea9 Mon Sep 17 00:00:00 2001
+From: Claudiu Beznea <claudiu.beznea@microchip.com>
+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 <claudiu.beznea@microchip.com>
+Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
+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(+)
+
+diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-sama7g5ek.dts
+index 8b13b031a167..f0772fa01751 100644
+--- a/arch/arm/boot/dts/at91-sama7g5ek.dts
++++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
+@@ -196,11 +196,13 @@ vddioddr: VDD_DDR {
+ 
+ 					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>;
+ 					};
+ 				};
+-- 
+2.32.0
+