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

From: Pavel Machek <pavel@ucw.cz>
To: Ezra Buehler <ezra@easyb.ch>
Cc: "Robin Murphy" <robin.murphy@arm.com>,
	"Andreas Färber" <afaerber@suse.de>,
	linux-realtek-soc@lists.infradead.org,
	linux-leds@vger.kernel.org, linux-rtc@vger.kernel.org,
	"Alessandro Zummo" <a.zummo@towertech.it>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	csd@princeton.com.tw, devicetree@vger.kernel.org,
	sales@fdhisi.com, "Mark Brown" <broonie@kernel.org>,
	linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
	"Rob Herring" <robh+dt@kernel.org>,
	"Jacek Anaszewski" <jacek.anaszewski@gmail.com>,
	zypeng@titanmec.com, linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	"Dan Murphy" <dmurphy@ti.com>,
	linux-rockchip@lists.infradead.org
Subject: Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement TM1628/FD628/AiP1618 LED controllers
Date: Wed, 26 Feb 2020 14:03:00 +0100	[thread overview]
Message-ID: <20200226130300.GB2800@duo.ucw.cz> (raw)
In-Reply-To: <E33E27B9-D33C-4182-A5B1-C72FA40470BC@easyb.ch>

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Hi!

> > On 13 Dec 2019, at 15:07, Robin Murphy <robin.murphy@arm.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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