Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: i36tkYAydb6Qyx0pWKDoUlWxa087eANuG50jHtCZzZWiXdh84gTInLQTCn9YqRMv779t9unDEo
 +OYCIU8kY/Rl6bt7+a6xJ9DBDKJR1JtfFSP9/DY+1Tq03vD2hQKnFRkWbsJmR4mn0O7UdVS8Cr
 /fZIW16BHR+SZ30qyelZPP0Nsw4gFNzrVIdz6cvhKuAz4Y1s17pUzI5im25L2CPOwN5f84KT5j
 J5V2wr916v1DN/ITtR85fpRd5/yZYT3EG/4PH5aOpdLrlUQar2isNaUHs0j83qs/J5zynyNJT+
 aRUlEOF2xrOJ8iUV6E4rKy+K
From:   Claudiu Beznea <claudiu.beznea@microchip.com>
To:     <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
        <ludovic.desroches@microchip.com>, <linux@armlinux.org.uk>,
        <robh+dt@kernel.org>
CC:     <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH 1/3] ARM: dts: at91: sama7g5ek: add suspend voltage for ddr3l rail
Date:   Tue, 28 Sep 2021 11:42:55 +0300
Message-ID: <20210928084257.2188017-2-claudiu.beznea@microchip.com>
In-Reply-To: <20210928084257.2188017-1-claudiu.beznea@microchip.com>
References: <20210928084257.2188017-1-claudiu.beznea@microchip.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
Precedence: bulk

SAMA7G5-EK board has DDR3L type of memory soldered. This needs 1.35V. The
1.35V for DDR3L rail at run-time is selected by the proper configuration
on SELV2 pin (for 1.35V it needs to be in high-z state). When suspended
the MCP16502 PMIC soldered on SAMA7G5-EK will use different sets of
configuration registers to provide proper voltages on its rail. Run-time
configuration registers could be configured differently than suspend
configuration register for MCP16502 (VSEL2 affects only run-time
configuration). In suspend states the DDR3L memory soldered on SAMA7G5-EK
switches to self-refresh. Even on self-refresh it needs to be powered by
a 1.35V rail. Thus, make sure the PMIC is configured properly when system
is suspended.

Fixes: 7540629e2fc7 (ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 arch/arm/boot/dts/at91-sama7g5ek.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-sama7g5ek.dts
index 4e6bcb7fdfd4..be905eb1da31 100644
--- a/arch/arm/boot/dts/at91-sama7g5ek.dts
+++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
@@ -206,11 +206,13 @@ vddioddr: VDD_DDR {
 
 					regulator-state-standby {
 						regulator-on-in-suspend;
+						regulator-suspend-microvolt = <1350000>;
 						regulator-mode = <4>;
 					};
 
 					regulator-state-mem {
 						regulator-on-in-suspend;
+						regulator-suspend-microvolt = <1350000>;
 						regulator-mode = <4>;
 					};
 				};
-- 
2.25.1