linux-kernel - [PATCH v2 3/3] ARM: dts: imx6qdl-cubox-i: enable DSM for the RTC

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Date:   Mon, 20 Jul 2020 12:24:01 +0100
From:   miguelborgesdefreitas@...il.com
To:     a.zummo@...ertech.it
Cc:     baruch@...s.co.il, linux@...linux.org.uk,
        alexandre.belloni@...tlin.com, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com,
        miguelborgesdefreitas@...il.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] ARM: dts: imx6qdl-cubox-i: enable DSM for the RTC

From: Miguel Borges de Freitas <miguelborgesdefreitas@...il.com>

The cubox-i is one of the examples in which the necessary filtering
circuit in the VDD pin of the pcf8523 (1 kOhm resistor + 3.3 microF
capacitor) is not available. This leads to failures in the RTC when,
after a power cycle, the voltage drop exceeds the recommended value of
0.7V/ms. The hw is designed to support the battery switch-over
functionality only in direct-switching mode. Hence, this enforces the
option in the cubox-i device-tree.

Signed-off-by: Miguel Borges de Freitas <miguelborgesdefreitas@...il.com>
---
Changes in v2:
- Added extended commit message for git history
- Separate dt bindings documentation into a single patch

 arch/arm/boot/dts/imx6qdl-cubox-i.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
index e3be453..a226c4e 100644
--- a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
@@ -144,6 +144,7 @@
 	rtc@68 {
 		compatible = "nxp,pcf8523";
 		reg = <0x68>;
+		pm-enable-dsm;
 	};
 };
 
-- 
1.8.3.1