linux-kernel - [PATCH 4.4 072/138] ARM: dts: sunxi: Add a startup delay for fixed regulator enabled phys

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Date:	Thu, 18 Aug 2016 15:58:02 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH 4.4 072/138] ARM: dts: sunxi: Add a startup delay for fixed regulator enabled phys

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdegoede@...hat.com>

commit fc51b632c7b047c25807023b76f3877aed19c770 upstream.

It seems that recent kernels have a shorter timeout when scanning for
ethernet phys causing us to hit a timeout on boards where the phy's
regulator gets enabled just before scanning, which leads to non working
ethernet.

A 10ms startup delay seems to be enough to fix it, this commit adds a
20ms startup delay just to be safe.

This has been tested on a sun4i-a10-a1000 and sun5i-a10s-wobo-i5 board,
both of which have non-working ethernet on recent kernels without this
fix.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/sun4i-a10-a1000.dts      |    1 +
 arch/arm/boot/dts/sun4i-a10-hackberry.dts  |    1 +
 arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts |    1 +
 arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts   |    1 +
 4 files changed, 4 insertions(+)

--- a/arch/arm/boot/dts/sun4i-a10-a1000.dts
+++ b/arch/arm/boot/dts/sun4i-a10-a1000.dts
@@ -84,6 +84,7 @@
 		regulator-name = "emac-3v3";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <20000>;
 		enable-active-high;
 		gpio = <&pio 7 15 GPIO_ACTIVE_HIGH>;
 	};
--- a/arch/arm/boot/dts/sun4i-a10-hackberry.dts
+++ b/arch/arm/boot/dts/sun4i-a10-hackberry.dts
@@ -66,6 +66,7 @@
 		regulator-name = "emac-3v3";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <20000>;
 		enable-active-high;
 		gpio = <&pio 7 19 GPIO_ACTIVE_HIGH>;
 	};
--- a/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts
+++ b/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts
@@ -80,6 +80,7 @@
 		regulator-name = "emac-3v3";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <20000>;
 		enable-active-high;
 		gpio = <&pio 7 19 GPIO_ACTIVE_HIGH>;   /* PH19 */
 	};
--- a/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts
+++ b/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts
@@ -79,6 +79,7 @@
 		regulator-name = "emac-3v3";
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <20000>;
 		enable-active-high;
 		gpio = <&pio 0 2 GPIO_ACTIVE_HIGH>;
 	};