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

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Date:   Fri, 28 Feb 2020 11:50:15 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
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



Le ven., févr. 28, 2020 at 15:42, H. Nikolaus Schaller 
<hns@...delico.com> a écrit :
> 
>>  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?

There are plenty you can use. I'd suggest KEY_F13 as it's 
general-purpose.

-Paul