linux-kernel - [PATCH] ARM: dts: vf610-zii-cfu1: Disable NOR flash/SPI controller

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Date:   Mon, 25 Mar 2019 11:30:17 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Chris Healy <cphealy@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: vf610-zii-cfu1: Disable NOR flash/SPI controller

Only a certain number of CFU1's come with NOR flash populated. Disable
it by default to avoid trying to probe NOR flash on devices that don't
have it. Devices that do have it can rely on the bootloader to enable
this node.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Chris Healy <cphealy@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Fabio Estevam <festevam@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 arch/arm/boot/dts/vf610-zii-cfu1.dts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/vf610-zii-cfu1.dts b/arch/arm/boot/dts/vf610-zii-cfu1.dts
index 6c78122401a1..afc25b33bd3b 100644
--- a/arch/arm/boot/dts/vf610-zii-cfu1.dts
+++ b/arch/arm/boot/dts/vf610-zii-cfu1.dts
@@ -87,7 +87,12 @@
 	bus-num = <1>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_dspi1>;
-	status = "okay";
+	/*
+	 * Some CFU1s come with SPI-NOR chip DNPed, so we leave this
+	 * node disabled by default and rely on bootloader to enable
+	 * it when appropriate.
+	 */
+	status = "disabled";
 
 	m25p128@0 {
 		#address-cells = <1>;
-- 
2.20.1