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

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Date:   Wed, 26 Feb 2020 14:03:00 +0100
From:   Pavel Machek <pavel@....cz>
To:     Ezra Buehler <ezra@...yb.ch>
Cc:     Robin Murphy <robin.murphy@....com>,
        Andreas Färber <afaerber@...e.de>,
        linux-realtek-soc@...ts.infradead.org, linux-leds@...r.kernel.org,
        linux-rtc@...r.kernel.org, Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        csd@...nceton.com.tw, devicetree@...r.kernel.org, sales@...isi.com,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        zypeng@...anmec.com, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, Dan Murphy <dmurphy@...com>,
        linux-rockchip@...ts.infradead.org
Subject: Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement
 TM1628/FD628/AiP1618 LED controllers

Hi!

> > On 13 Dec 2019, at 15:07, Robin Murphy <robin.murphy@....com> wrote:
> > 
> > I also have one of the H96 Max boxes (which I picked up out of curiosity
> > for the mysterious RK3318) with an FD6551, although I've not attacked
> > that one with the logic analyser yet to see how similar it is.
> 
> I have a T9 (RK3328) TV box with the same chip in it. The FD6551 uses an
> I2C-like protocol. Every digit (and the symbols) have an I2C address,
> but, the display does not signal ACK. AFAIK the FD650 and FD655 which
> are used in other boxes (Amlogic) are very similar.
> 
> So far, I have whipped up a proof-of-cocept driver that uses i2c-gpio.
> The digits seem to be rotated by 180 degrees. So, in order to use
> map_to_7segment.h I had to define the BIT_SEG7_* constants differently.
> My display also has multiple symbols (WIFI, network, pause, play, USB,
> alarm) that are controlled by writing to the same address as for the
> colon.
> 
> I’d love to work on a driver (similar to Andreas’ SPI based driver) for
> these I2C connected chips.

Create a driver in drivers/auxdisplay for alphanumeric parts. You can
then export any remaining symbols as LEDs if it will provide benefits.

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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