linux-kernel - [PATCH v2 11/15] ARM: at91: PM: Add Backup mode for SAMA7D65

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Message-ID: <76a89f1ae5e9c4d337c2a28e4b1d0e5cef63e5fe.1739221064.git.Ryan.Wanner@microchip.com>
Date: Mon, 10 Feb 2025 14:13:11 -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>
CC: <linux@...linux.org.uk>, <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 v2 11/15] 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 1eec68e92f8d8..55cab31ce1ecb 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -707,6 +707,9 @@ 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);
 }
 
 
@@ -1065,7 +1068,8 @@ 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