From: Gregory CLEMENT <gregory.clement@bootlin.com>
To: Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
linux-kernel@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org, Tony Lindgren <tony@atomide.com>,
linux-omap@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Gregory CLEMENT <gregory.clement@bootlin.com>
Subject: [PATCH 1/3] dt-bindings: regulator: twl6030: Add retain-on-reset property
Date: Thu, 25 Jul 2019 11:45:40 +0200 [thread overview]
Message-ID: <20190725094542.16547-2-gregory.clement@bootlin.com> (raw)
In-Reply-To: <20190725094542.16547-1-gregory.clement@bootlin.com>
During reset the VMMC regulator doesn't reach 0V and only drops to
1.8V, furthermore the pulse width is under 200us whereas the SD
specification expect 1ms.
For this 2 reasons being able to no reset at all the VMMC during warm
reset and keep the current voltage is a good workaround. The TWL6030
allows this but needs to be aware of it and this configuration should
also be shared with the bootloader.
This is the purpose of this new property: ti,retain-on-reset
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
.../devicetree/bindings/regulator/twl-regulator.txt | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/regulator/twl-regulator.txt b/Documentation/devicetree/bindings/regulator/twl-regulator.txt
index 74a91c4f8530..549f80436deb 100644
--- a/Documentation/devicetree/bindings/regulator/twl-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/twl-regulator.txt
@@ -71,3 +71,10 @@ Example:
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <3000000>;
};
+
+For twl6030 regulators/LDOs:
+
+ - ti,retain-on-reset: Does not turn off the supplies during warm
+ reset. Could be needed for VMMC, as TWL6030
+ reset sequence for this signal does not comply
+ with the SD specification.
--
2.20.1
next prev parent reply other threads:[~2019-07-25 9:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 9:45 [PATCH 0/3] regulator: twl6030: Fix the VMMC reset behavior Gregory CLEMENT
2019-07-25 9:45 ` Gregory CLEMENT [this message]
2019-08-12 13:10 ` Applied "dt-bindings: regulator: twl6030: Add retain-on-reset property" to the regulator tree Mark Brown
2019-08-12 13:10 ` Mark Brown
2019-07-25 9:45 ` [PATCH 2/3] regulator: twl6030: use variable for device node Gregory CLEMENT
2019-08-12 13:10 ` Applied "regulator: twl6030: use variable for device node" to the regulator tree Mark Brown
2019-08-12 13:10 ` Mark Brown
2019-07-25 9:45 ` [PATCH 3/3] regulator: twl6030: workaround the VMMC reset behavior Gregory CLEMENT
2019-08-12 13:10 ` Applied "regulator: twl6030: workaround the VMMC reset behavior" to the regulator tree Mark Brown
2019-08-12 13:10 ` Mark Brown
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