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ARM: at91: pm: add backup mode support for SAMA7G5

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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
This commit is contained in:
Claudiu Beznea 2021-04-15 13:50:06 +03:00 committed by Nicolas Ferre
parent d2d4716d83
commit f205adb608
2 changed files with 9 additions and 1 deletions
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3
arch/arm/mach-at91/pm.c
View File

@ -729,7 +729,8 @@ static int __init at91_pm_backup_init(void)
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))

7
arch/arm/mach-at91/pm_suspend.S
View File

@ -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