linux-kernel - [PATCH 12/16] ARM: at91: PM: Add Backup mode for SAMA7D65

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Message-ID: <c627ef4928eeec72e63406adef31bd740ad18106.1738257860.git.Ryan.Wanner@microchip.com>
Date: Thu, 30 Jan 2025 10:33:52 -0700
From: <Ryan.Wanner@...rochip.com>
To: <lee@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <claudiu.beznea@...on.dev>, <sre@...nel.org>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<p.zabel@...gutronix.de>, <linux@...linux.org.uk>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-rtc@...r.kernel.org>, Ryan Wanner <Ryan.Wanner@...rochip.com>
Subject: [PATCH 12/16] ARM: at91: PM: Add Backup mode for SAMA7D65

From: Ryan Wanner <Ryan.Wanner@...rochip.com>

Add config check that enables Backup mode for SAMA7D65 SoC.

Add SHDWC_SR read to clear the status bits once finished exiting low
power modes. This is only for SAMA7D65 SoCs.

Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
---
 arch/arm/mach-at91/pm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index a8cd1300a8f33..5e458254e1f1c 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -706,6 +706,9 @@ static int at91_pm_enter(suspend_state_t state)
 static void at91_pm_end(void)
 {
 	at91_pm_config_ws(soc_pm.data.mode, false);
+
+	if (IS_ENABLED(CONFIG_SOC_SAMA7D65))
+		readl(soc_pm.data.shdwc + 0x08);
 }
 
 
@@ -1064,7 +1067,8 @@ 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))
-- 
2.43.0