linux-kernel - [PATCH 2/2] ARM: dts: n900: remove mmc1 card detect gpio

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Date:   Fri, 12 Jun 2020 14:53:59 +0200
From:   Merlijn Wajer <merlijn@...zup.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     pavel@....cz, Merlijn Wajer <merlijn@...zup.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Tony Lindgren <tony@...mide.com>,
        Benoît Cousson <bcousson@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Mattias Jacobsson <2pi@....nu>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Mark Gross <mgross@...ux.intel.com>,
        linux-omap@...r.kernel.org (open list:OMAP DEVICE TREE SUPPORT),
        devicetree@...r.kernel.org (open list:OMAP DEVICE TREE SUPPORT),
        linux-kernel@...r.kernel.org (open list),
        linux-input@...r.kernel.org (open list:INPUT (KEYBOARD, MOUSE, JOYSTICK
        , TOUCHSCREEN)...)
Subject: [PATCH 2/2] ARM: dts: n900: remove mmc1 card detect gpio

Instead, expose the key via the input framework, as SW_MACHINE_COVER

The chip-detect GPIO is actually detecting if the cover is closed.
Technically it's possible to use the SD card with open cover. The
only downside is risk of battery falling out and user being able
to physically remove the card.

The behaviour of SD card not being available when the device is
open is unexpected and creates more problems than it solves. There
is a high chance, that more people accidently break their rootfs
by opening the case without physically removing the card.

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Merlijn Wajer <merlijn@...zup.org>
---
 arch/arm/boot/dts/omap3-n900.dts | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index 4089d97405c9..3dbcae3d60d2 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -105,6 +105,14 @@ proximity_sensor {
 			linux,code = <SW_FRONT_PROXIMITY>;
 			linux,can-disable;
 		};
+
+		machine_cover {
+			label = "Machine Cover";
+			gpios = <&gpio6 0 GPIO_ACTIVE_LOW>; /* 160 */
+			linux,input-type = <EV_SW>;
+			linux,code = <SW_MACHINE_COVER>;
+			linux,can-disable;
+		};
 	};
 
 	isp1707: isp1707 {
@@ -819,10 +827,6 @@ &mmc1 {
 	pinctrl-0 = <&mmc1_pins>;
 	vmmc-supply = <&vmmc1>;
 	bus-width = <4>;
-	/* For debugging, it is often good idea to remove this GPIO.
-	   It means you can remove back cover (to reboot by removing
-	   battery) and still use the MMC card. */
-	cd-gpios = <&gpio6 0 GPIO_ACTIVE_LOW>; /* 160 */
 };
 
 /* most boards use vaux3, only some old versions use vmmc2 instead */
-- 
2.24.1