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

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Date:   Fri, 14 Feb 2020 15:49:15 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Merlijn Wajer <merlijn@...zup.org>
Cc:     Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mattias Jacobsson <2pi@....nu>,
        "Darren Hart (VMware)" <dvhart@...radead.org>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] ARM: dts: n900: remove mmc1 card detect gpio

Hi,

On Fri, Feb 14, 2020 at 02:02:48PM +0100, Merlijn Wajer wrote:
> Instead, expose the key via the input framework, as SW_MACHINE_COVER

How about:

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.

> ---

Missing SoB.

Patch itself is

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

>  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 7028a7cb2849..ed773e1609a5 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -108,6 +108,14 @@
>  			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 {
> @@ -805,10 +813,6 @@
>  	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 */
> -- 
> 2.23.0
> 

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