linux-kernel - Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement TM1628/FD628/AiP1618 LED controllers

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Message-ID: <20191221182057.GA32732@amd>
Date:   Sat, 21 Dec 2019 19:20:57 +0100
From:   Pavel Machek <pavel@....cz>
To:     Andreas Färber <afaerber@...e.de>
Cc:     linux-realtek-soc@...ts.infradead.org, linux-leds@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org, Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        linux-amlogic@...ts.infradead.org, Roc He <hepeng@...oo.tv>,
        zypeng@...anmec.com, sales@...isi.com, csd@...nceton.com.tw
Subject: Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement
 TM1628/FD628/AiP1618 LED controllers

Hi!

> This patch series implements the LED controllers found in some RTD1295 based
> TV set-top boxes.
> 
> Ever since I've had mainline Linux kernels booting on my Zidoo X9S TV box,
> it's been bugging me that it kept displaying "boot" on its front display.
> A hot lead was a TM1628 chip on the front display's daughterboard, which
> English and Chinese datasheets were available for. The biggest
> hurdle

Fun :-).

> It goes on to add a "text" attribute to the driver that enables DT-configured
> seven-segment displays; I was expecting to find precedence in auxdisplay
> subsystem but came up empty. So my driver currently integrates its own
> generic (but incomplete) character-to-8-segments mapping, as well as in a
> second step a combined-characters-to-8-segments mapping, which then gets
> mapped to the chipset's available output lines. Doing this as sysfs
> device

I did not investigate this in great detail; but if it is displaying
characters, auxdisplay is probably right subsystem to handle that. I
guess LEDs can still take the low-level parts...

Oh, and common dimming for many LEDs is seen on other hardware, too
(Turris routers). Not sure how to handle that, either :-(.

Best regards,
									Pavel



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

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