[PATCH 5.4 020/111] ARM: dts: turris-omnia: configure LED[2]/INTn pin as interrupt pin

[Greg Kroah-Hartman]

From: Marek Behún <kabel at kernel.org>

commit a26c56ae67fa9fbb45a8a232dcd7ebaa7af16086 upstream.

Use the `marvell,reg-init` DT property to configure the LED[2]/INTn pin
of the Marvell 88E1514 ethernet PHY on Turris Omnia into interrupt mode.

Without this the pin is by default in LED[2] mode, and the Marvell PHY
driver configures LED[2] into "On - Link, Blink - Activity" mode.

This fixes the issue where the pca9538 GPIO/interrupt controller (which
can't mask interrupts in HW) received too many interrupts and after a
time started ignoring the interrupt with error message:
  IRQ 71: nobody cared

There is a work in progress to have the Marvell PHY driver support
parsing PHY LED nodes from OF and registering the LEDs as Linux LED
class devices. Once this is done the PHY driver can also automatically
set the pin into INTn mode if it does not find LED[2] in OF.

Until then, though, we fix this via `marvell,reg-init` DT property.

Signed-off-by: Marek Behún <kabel at kernel.org>
Reported-by: Rui Salvaterra <rsalvaterra at gmail.com>
Fixes: 26ca8b52d6e1 ("ARM: dts: add support for Turris Omnia")
Cc: Uwe Kleine-König <uwe at kleine-koenig.org>
Cc: linux-arm-kernel at lists.infradead.org
Cc: Andrew Lunn <andrew at lunn.ch>
Cc: Gregory CLEMENT <gregory.clement at bootlin.com>
Cc: <stable at vger.kernel.org>
Tested-by: Rui Salvaterra <rsalvaterra at gmail.com>
Reviewed-by: Andrew Lunn <andrew at lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement at bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/arm/boot/dts/armada-385-turris-omnia.dts |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
+++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
@@ -236,6 +236,7 @@
 		status = "okay";
 		compatible = "ethernet-phy-id0141.0DD1", "ethernet-phy-ieee802.3-c22";
 		reg = <1>;
+		marvell,reg-init = <3 18 0 0x4985>;
 
 		/* irq is connected to &pcawan pin 7 */
 	};