linux-kernel - N900: fixing MMC at boot

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Date:	Sat, 6 Dec 2014 18:35:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	pali.rohar@...il.com, sre@...ian.org, sre@...g0.de,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, freemangordon@....bg
Subject: N900: fixing MMC at boot

Hi!

For a long time, MMC was not working during boot... (making the box
unusable without nfsroot). It seems problem is in the regulators,
because with diff below, I was able to mount root on SD card for a
first time ... in a long time.

Signed-off-by: Pavel Machek <pavel@....cz> [but not for upstream]

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index 8607433..07791c6 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -4,7 +4,8 @@ Optional properties:
 - regulator-name: A string used as a descriptive name for regulator outputs
 - regulator-min-microvolt: smallest voltage consumers may set
 - regulator-max-microvolt: largest voltage consumers may set
-- regulator-microvolt-offset: Offset applied to voltages to compensate for voltage drops
+- regulator-microvolt-offset: Offset applied to voltages to compensate for 
+  voltage drops
 - regulator-min-microamp: smallest current consumers may set
 - regulator-max-microamp: largest current consumers may set
 - regulator-always-on: boolean, regulator should never be disabled
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index 11d8afd..707928d 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -287,31 +287,35 @@
 	regulator-name = "V28";
 	regulator-min-microvolt = <2800000>;
 	regulator-max-microvolt = <2800000>;
-	regulator-always-on; /* due battery cover sensor */
+	regulator-always-on; /* due to battery cover sensor */
 };
 
 &vaux2 {
 	regulator-name = "VCSI";
 	regulator-min-microvolt = <1800000>;
 	regulator-max-microvolt = <1800000>;
+	regulator-always-on; /* FIXME */
 };
 
 &vaux3 {
 	regulator-name = "VMMC2_30";
 	regulator-min-microvolt = <2800000>;
 	regulator-max-microvolt = <3000000>;
+	regulator-always-on; /* FIXME */
 };
 
 &vaux4 {
 	regulator-name = "VCAM_ANA_28";
 	regulator-min-microvolt = <2800000>;
 	regulator-max-microvolt = <2800000>;
+	regulator-always-on; /* FIXME */
 };
 
 &vmmc1 {
 	regulator-name = "VMMC1";
 	regulator-min-microvolt = <1850000>;
 	regulator-max-microvolt = <3150000>;
+	regulator-always-on; /* FIXME */
 };
 
 &vmmc2 {
@@ -339,13 +343,14 @@
 	regulator-name = "VMMC2_IO_18";
 	regulator-min-microvolt = <1800000>;
 	regulator-max-microvolt = <1800000>;
+	regulator-always-on; /* FIXME */
 };
 
 &vio {
 	regulator-name = "VIO";
 	regulator-min-microvolt = <1800000>;
 	regulator-max-microvolt = <1800000>;
-
+	regulator-always-on; /* FIXME */
 };
 
 &vintana1 {

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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