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From 62be32b56ff31b2cd048a53fac40a165c5bc66cd Mon Sep 17 00:00:00 2001
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Date: Thu, 15 Apr 2021 13:50:06 +0300
Subject: [PATCH 215/247] ARM: at91: pm: add backup mode support for SAMA7G5
Adapt at91_pm_backup_init() to work for SAMA7G5. Also, set the LPM pin
to shutdown controller. This will signal to PMIC that it needs to switch
to the state corresponding to backup mode.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210415105010.569620-21-claudiu.beznea@microchip.com
---
arch/arm/mach-at91/pm.c | 3 ++-
arch/arm/mach-at91/pm_suspend.S | 7 +++++++
2 files changed, 9 insertions(+), 1 deletion(-)
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -744,7 +744,8 @@ static int __init at91_pm_backup_init(vo
struct platform_device *pdev;
int ret = -ENODEV, located = 0;
- if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
+ if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) &&
+ !IS_ENABLED(CONFIG_SOC_SAMA7G5))
return -EPERM;
if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -106,6 +106,12 @@ lp_done_\ena:
#endif
.endm
+ .macro at91_backup_set_lpm reg
+#ifdef CONFIG_SOC_SAMA7
+ orr \reg, \reg, #0x200000
+#endif
+ .endm
+
.text
.arm
@@ -989,6 +995,7 @@ ulp_exit:
ldr r0, .shdwc
mov tmp1, #0xA5000000
add tmp1, tmp1, #0x1
+ at91_backup_set_lpm tmp1
str tmp1, [r0, #0]
.endm
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