linux-kernel - Re: [PATCH 1/2] ARM64: dts: meson-gxm: Add R-Box Pro

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Date:   Wed, 18 Jan 2017 14:18:39 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Andreas Färber <afaerber@...e.de>
Cc:     linux-amlogic@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Carlo Caione <carlo@...one.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ARM64: dts: meson-gxm: Add R-Box Pro

Andreas Färber <afaerber@...e.de> writes:

> Am 17.01.2017 um 04:06 schrieb Andreas Färber:
>> +	leds {
>> +		compatible = "gpio-leds";
>> +
>> +		blue {
>> +			label = "rbox-pro:blue:on";
>> +			gpios = <&gpio_ao GPIOAO_9 GPIO_ACTIVE_HIGH>;
>> +			default-state = "on";
>> +		};
>> +
>> +		red {
>> +			label = "rbox-pro:red:standby";
>> +			gpios = <&gpio GPIODV_28 GPIO_ACTIVE_HIGH>;
>> +			default-state = "off";
>> +			retain-state-suspended;
>> +			panic-indicator;
>> +		};
>> +	};
>
> The original property names for these two were led and red. If anyone
> has better label names than the above, please speak up. Ditto for
> vega-s95. On the odroidc2 it's called alive but uses heartbeat there.
>
> The vendor device tree had a third "mcu" GPIO in the sysled node,
> GPIOAO_6, which leads to immediate power-off. I tried using
> "gpio-poweroff" to configure this pin, but that driver fails to
> initialize because some pm callback is already registered - I assume
> from psci, which apparently succeeds to power-off the system, too. For
> comparison, the S905 based Vega S95 Telos has no such mcu property. Any
> thoughts?
>
> Also, any ideas how best to switch from blue to red for suspend? Add
> pinctrl properties above? systemd service doing echo from userspace? I
> assume in Android the Amlogic sysled driver handles all that logic -
> didn't find any suspend equivalent to gpio-poweroff.

in leds-gpio, when retain-state-suspended is not set, the LED is
automatically set to value 0.  I wonder if leds-gpio should grow support
to make the suspend value configurable?  Or a property like
"toggle-state-suspended" ?

Kevin