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

From: Pavel Machek <pavel@ucw.cz>
To: "Andreas Färber" <afaerber@suse.de>
Cc: linux-rtc@vger.kernel.org,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Roc He <hepeng@zidoo.tv>,
	csd@princeton.com.tw, linux-realtek-soc@lists.infradead.org,
	Mark Brown <broonie@kernel.org>,
	linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
	devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Dan Murphy <dmurphy@ti.com>,
	linux-leds@vger.kernel.org, zypeng@titanmec.com,
	linux-amlogic@lists.infradead.org, sales@fdhisi.com,
	linux-arm-kernel@lists.infradead.org,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>
Subject: Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement TM1628/FD628/AiP1618 LED controllers
Date: Sat, 21 Dec 2019 19:20:57 +0100	[thread overview]
Message-ID: <20191221182057.GA32732@amd> (raw)
In-Reply-To: <20191212033952.5967-1-afaerber@suse.de>

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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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