From 23b43c1a821615e04848f85ff90dcc3c3aa96c0c Mon Sep 17 00:00:00 2001 From: Ryan Wanner Date: Thu, 27 Feb 2025 08:51:58 -0700 Subject: ARM: at91: pm: Add Backup mode for SAMA7D65 Add config check that enables Backup mode for SAMA7D65 SoC. Add SHDWC_SR read to clear the status bits once finished exiting backup mode. This is only for SAMA7D65 SoCs. The SHDWC status register needs to be cleared after exiting backup mode to clear the wake up pin status. Signed-off-by: Ryan Wanner Link: https://lore.kernel.org/r/3a1f59af1ac9322b0203694b535d5d13120a31eb.1740671156.git.Ryan.Wanner@microchip.com [claudiu.beznea: dropped extra blank lines, use {} for multi-line statements that includes comments, s/PM/pm in commit title to have the same pattern accross all commits] Signed-off-by: Claudiu Beznea --- arch/arm/mach-at91/pm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index 6c4e168f1844..a2d188b47866 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -647,6 +647,11 @@ static void at91_pm_suspend(suspend_state_t state) at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn, &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz); + + if (IS_ENABLED(CONFIG_SOC_SAMA7D65)) { + /* SHDWC.SR */ + readl(soc_pm.data.shdwc + 0x08); + } } else { at91_suspend_finish(0); } @@ -1065,7 +1070,8 @@ static int __init at91_pm_backup_init(void) int ret = -ENODEV, located = 0; if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) && - !IS_ENABLED(CONFIG_SOC_SAMA7G5)) + !IS_ENABLED(CONFIG_SOC_SAMA7G5) && + !IS_ENABLED(CONFIG_SOC_SAMA7D65)) return -EPERM; if (!at91_is_pm_mode_active(AT91_PM_BACKUP)) -- cgit v1.2.3