linux-kernel - Re: [PATCH v1 13/19] arm: dts: mt7623: move node mt6323 leds to mt6323.dtsi

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Date:   Mon, 19 Mar 2018 00:46:41 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Sean Wang <sean.wang@...iatek.com>, Rob Herring <robh@...nel.org>
Cc:     mark.rutland@....com, devicetree@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v1 13/19] arm: dts: mt7623: move node mt6323 leds to
 mt6323.dtsi



On 03/02/2018 11:46 PM, Sean Wang wrote:
> On Fri, 2018-03-02 at 09:40 -0600, Rob Herring wrote:
>> On Fri, Feb 23, 2018 at 06:16:33PM +0800, sean.wang@...iatek.com wrote:
>>> From: Sean Wang <sean.wang@...iatek.com>
>>>
>>> Since those LEDs are parts of PMIC MT6323, it is reasonable to merge
>>> those LEDs node definition back into mt6323.dtsi. This way can improve
>>> the reusability of those nodes among different boards with the same PMIC.
>>>
>>> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
>>> Cc: Lee Jones <lee.jones@...aro.org>
>>> ---
>>>  arch/arm/boot/dts/mt6323.dtsi                 | 26 ++++++++++++++++++++++++-
>>>  arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts | 28 ---------------------------
>>>  2 files changed, 25 insertions(+), 29 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/mt6323.dtsi b/arch/arm/boot/dts/mt6323.dtsi
>>> index 7c783d6..44c5642 100644
>>> --- a/arch/arm/boot/dts/mt6323.dtsi
>>> +++ b/arch/arm/boot/dts/mt6323.dtsi
>>> @@ -1,5 +1,5 @@
>>>  /*
>>> - * Copyright (c) 2017 MediaTek Inc.
>>> + * Copyright (c) 2017-2018 MediaTek Inc.
>>>   * Author: John Crispin <john@...ozen.org>
>>>   *	   Sean Wang <sean.wang@...iatek.com>
>>>   * This program is free software; you can redistribute it and/or modify
>>> @@ -237,5 +237,29 @@
>>>  				regulator-enable-ramp-delay = <216>;
>>>  			};
>>>  		};
>>> +
>>> +		leds {
>>> +			compatible = "mediatek,mt6323-led";
>>> +			#address-cells = <1>;
>>> +			#size-cells = <0>;
>>> +
>>> +			led@0 {
>>> +				reg = <0>;
>>> +				label = "mt6323:isink:green";
>>
>> Changing the label potentially breaks userspace. And the fact that it is 
>> a green LED is very much board specific. So I think the old location was 
>> correct. You could put the parent node here and leave these child nodes 
>> in the board specific dts file.
>>
> 
> yes, I really made a mistake on breaking userspace with a label change.
> 
> I will keep the parent node here and then leave these child nodes into
> board specific dts files. thanks for your idea!
> 

Sorry I didn't see your email when I wrote my first comment. Yes this sounds
like the proper way to do it.

Regards,
Matthias

>>
>>> +				default-state = "off";
>>> +			};
>>> +
>>> +			led@1 {
>>> +				reg = <1>;
>>> +				label = "mt6323:isink:red";
>>> +				default-state = "off";
>>> +			};
>>> +
>>> +			led@2 {
>>> +				reg = <2>;
>>> +				label = "mt6323:isink:blue";
>>> +				default-state = "off";
>>> +			};
>>> +		};
>>>  	};
>>>  };
>>> diff --git a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>>> index 75e61c4..767b225 100644
>>> --- a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>>> +++ b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>>> @@ -483,34 +483,6 @@
>>>  	status = "okay";
>>>  };
>>>  
>>> -&pwrap {
>>> -	mt6323 {
>>> -		mt6323led: led {
>>> -			compatible = "mediatek,mt6323-led";
>>> -			#address-cells = <1>;
>>> -			#size-cells = <0>;
>>> -
>>> -			led@0 {
>>> -				reg = <0>;
>>> -				label = "bpi-r2:isink:green";
>>> -				default-state = "off";
>>> -			};
>>> -
>>> -			led@1 {
>>> -				reg = <1>;
>>> -				label = "bpi-r2:isink:red";
>>> -				default-state = "off";
>>> -			};
>>> -
>>> -			led@2 {
>>> -				reg = <2>;
>>> -				label = "bpi-r2:isink:blue";
>>> -				default-state = "off";
>>> -			};
>>> -		};
>>> -	};
>>> -};
>>> -
>>>  &spi0 {
>>>  	pinctrl-names = "default";
>>>  	pinctrl-0 = <&spi0_pins_a>;
>>> -- 
>>> 2.7.4
>>>
> 
>