linux-kernel - Re: [PATCH 2/4] ARM: dts: omap4-droid4: Update backlight dt properties

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Date:   Fri, 8 Mar 2019 16:14:22 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, jacek.anaszewski@...il.com, tony@...mide.com,
        lee.jones@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH 2/4] ARM: dts: omap4-droid4: Update backlight dt
 properties

Hi!

> Update the properties for the lm3532 device node for droid4.
> With this change the backlight LED string and the keypad
> LED strings will be controlled separately.
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>  arch/arm/boot/dts/omap4-droid4-xt894.dts | 27 +++++++++++++++++-------
>  1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts
> index e21ec929f096..94e3d53dbcf3 100644
> --- a/arch/arm/boot/dts/omap4-droid4-xt894.dts
> +++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts
> @@ -6,6 +6,7 @@
>  /dts-v1/;
>  
>  #include <dt-bindings/input/input.h>
> +#include <dt-bindings/leds/leds-lm3532.h>
>  #include "omap443x.dtsi"
>  #include "motorola-cpcap-mapphone.dtsi"
>  
> @@ -383,20 +384,30 @@
>  };
>  
>  &i2c1 {
> -	lm3532@38 {
> +	led-controller@38 {
>  		compatible = "ti,lm3532";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
>  		reg = <0x38>;
>  
>  		enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
>  
> -		lcd_backlight: backlight {
> -			compatible = "ti,lm3532-backlight";
> +		ramp-up-ms = <LM3532_RAMP_1024us>;
> +		ramp-down-ms = <LM3532_RAMP_65536us>;

I guess dt people will have some comments here. I'd expect

ramp-up-us = <1024> would be more natural.

> +		lcd_backlight: led@0 {
> +			reg = <0>;
> +			led-sources = <2>;
> +			ti,led-mode = <LM3532_BL_MODE_MANUAL>;
> +			label = "backlight";

Ok, so we'll have lm3532::backlight. That is not too useful, as it
does not tell userland what kaclight it is.

main_display::backlight ?

OTOH this one is not too important as backlight subsystem should
handle this.

> +		led@1 {
> +			reg = <1>;
> +			led-sources = <1>;
> +			ti,led-mode = <LM3532_BL_MODE_MANUAL>;
> +			label = "keypad";

I guess best variant would be inputX::backlight here, but that might
be tricky to implement.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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