linux-kernel - Re: [PATCH v3 5/6] MIPS: DTS: CI20: multiple DTS improvements

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Date:   Fri, 28 Feb 2020 15:42:01 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Paul Boddie <paul@...die.org.uk>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com
Subject: Re: [PATCH v3 5/6] MIPS: DTS: CI20: multiple DTS improvements


> Am 28.02.2020 um 15:36 schrieb Paul Cercueil <paul@...pouillou.net>:
> 
> Hi Nikolaus,
> 
> Le dim., févr. 16, 2020 at 21:20, H. Nikolaus Schaller <hns@...delico.com> a écrit :
>> a) add DT node for SW1 as Enter button
>> The SW1 button can be used as a simple one-button keyboard
>> and is connected to PD17.
>> Note: SW1 has a second meaning to change the boot sequence
>> when pressed while powering on.
>> b) give eth0_power a defined voltage.
>> This is a 3.3V power switch (DVNET3.3V ).
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>> ---
>> arch/mips/boot/dts/ingenic/ci20.dts | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>> diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
>> index 1ab55be707af..4bacefa2cfce 100644
>> --- a/arch/mips/boot/dts/ingenic/ci20.dts
>> +++ b/arch/mips/boot/dts/ingenic/ci20.dts
>> @@ -4,6 +4,7 @@
>> #include "jz4780.dtsi"
>> #include <dt-bindings/clock/ingenic,tcu.h>
>> #include <dt-bindings/gpio/gpio.h>
>> +#include <dt-bindings/input/input.h>
>> / {
>> 	compatible = "img,ci20", "ingenic,jz4780";
>> @@ -25,6 +26,17 @@
>> 		       0x30000000 0x30000000>;
>> 	};
>> +	gpio-keys {
>> +		compatible = "gpio-keys";
>> +
>> +		sw1 {
>> +			label = "ci20:sw1";
>> +			linux,code = <KEY_ENTER>;
> 
> Why KEY_ENTER? It would make it impossible for applications to know that it's actually the switch that has been pressed an not the keyboard.

Ah, ok. I didn't think about the use case that a physical keyboard is connected to one of the USB ports.

What else would you propose? I think your argument is for every existing KEY_CODE. Should we add a new one?

BR and thanks,
Nikolaus